Database Users

Stuck in bootloop trying to flash 7.1 custom rom

My phone is android 6.0 and I've been using "TruPureXMM 2.9" ever since it first came out. I have a February 1, 2016 android security patch level and my system version is 24.11.18 clark_retus.retus.en.US retus
I had an older version of twrp so I just updated it to the latest one before attempting this ofc...
I tried flashing the latest RR and AICP and both give me boot loops and I always get this one problem where it says
"mount: failed to mount /dev/block/bootdevice/by-name
/modem at /firmware: Device or resource busy"
I'm not sure if this has anything to do with the bootloop though...
Going to recovery after seeing the bootloop I always get the "keep system read only?" prompt where i swipe to allow modification but i usually just restore back to my backup from there... i dont think allowing it and trying to boot again will get rid of the bootloop...
I followed the process of first doing a full wipe with twrp > flash rom > flash gapps > restart system
no idea what i'm doing wrong..

OppaiHeroStar said:
My phone is android 6.0 and I've been using "TruPureXMM 2.9" ever since it first came out. I have a February 1, 2016 android security patch level and my system version is 24.11.18 clark_retus.retus.en.US retus
...
I followed the process of first doing a full wipe with twrp > flash rom > flash gapps > restart system
no idea what i'm doing wrong..
Click to expand...
Click to collapse
1st - you need twrp 3.x+,
2nd - full wipe - format data, adv.wipe - all without micro sd.
3rd - flash rom, flash gapps(opengapps.org, ≤mini, arm64, 7.1)
Last Rr is for Nougat modem - you are on MM modem.
Flash RR 21.11.2017.
https://forum.xda-developers.com/mo...ial-resurrection-remix-v5-8-3-t3637204/page36

dzidexx said:
1st - you need twrp 3.x+,
2nd - full wipe - format data, adv.wipe - all without micro sd.
3rd - flash rom, flash gapps(opengapps.org, ≤mini, arm64, 7.1)
Last Rr is for Nougat modem - you are on MM modem.
Flash RR 21.11.2017.
https://forum.xda-developers.com/mo...ial-resurrection-remix-v5-8-3-t3637204/page36
Click to expand...
Click to collapse
The first 3 steps I've already done that since the beginning
Where can i get the nougat modem/is it possible to update to it? I guess that's the reason every single 7.1 custom rom I tried in the android development section gave me boot loops...
And could you link the 21.11.2017 version of RR? I'm looking at the download links for RR and I dont see one with that exact date
edit-just saw your edit

Custom roms for MM modem works better.

I fully wiped using TWRP, checked everything I possibly could except my micro SD card and I flashed RR-N-v5.8.5-20171121-clark-Final.zip then gapps arm64, 7.1 nano and it's still giving me boot loops. I'm using TWRP 3.2.1-0
im gonna try using gapps arm64 7.1 mini really quick since you said I should use that one and see if it boot loops... - Edit guess I was too optimistic thinking this would fix it

Bugs probably after flashing december RR.
Change twrp to 3.1.x, reboot twrp, change all partitions to ext4 - adv wipes - One by one - cache, system, data, reboot twrp.
Change back to f2fs - only cache & data, wipe all, flash what I wrote.

dzidexx said:
Bugs probably after flashing december RR.
Change twrp to 3.1.x, reboot twrp, change all partitions to ext4 - adv wipes - One by one - cache, system, data, reboot twrp.
Change back to f2fs - only cache & data, wipe all, flash what I wrote.
Click to expand...
Click to collapse
changed to 3.1.1-0 and did everything you said, still have boot loop...
when flashing this RR i still get this, not sure if it's a problem but thought I would just let you know
"mount: failed to mount /dev/block/bootdevice/by-name
/modem at /firmware: Device or resource busy"

OppaiHeroStar said:
changed to 3.1.1-0 and did everything you said, still have boot loop...
"mount: failed to mount /dev/block/bootdevice/by-name
/modem at /firmware: Device or resource busy"
Click to expand...
Click to collapse
It doesn`t matter.
Try another custom - LOS f.e.
If bootloop still will be - you should flash full stock.
Last MM for RetUs

dzidexx said:
It doesn`t matter.
Try another custom - LOS f.e.
If bootloop still will be - you should flash full stock.
Last MM for RetUs
Click to expand...
Click to collapse
I tried crDroidAndroid-7.1.2-20171119-clark-v3.8.3.zip and it still boot loops :\ I also already tried LineageOS and AICP before we started talking
I went back to my backup and it put me in a bootloop which never happened before but changing cache back to ext4 instead of f2fs fixed it..

OppaiHeroStar said:
when flashing this RR i still get this, not sure if it's a problem but thought I would just let you know
"mount: failed to mount /dev/block/bootdevice/by-name
/modem at /firmware: Device or resource busy"
Click to expand...
Click to collapse
A little late to chime in and this does not help with your current situation, but here's a little advice. I flash a lot of ROMs (how else am I going to test builds right?). This error happens all the time, BUT if you flash a ROM twice it should not show on the 2nd flash.
So flash order goes:
Wipe/Factory reset
Format data x3 (yes I format my data 3 times for every ROM)
Reboot
Wipe/Factory reset
ROM
ROM again
GAPPS
Wipe caches
Reboot
Do the Initial setup
Reboot before use
OPTIONAL Kernel (if its not already build in)
OPTIONAL Magisk (I never flash Magisk on a clean build but heck I'm expecting a NON boot most of the time anyways)

At this point I would flash the stock Nougat image via fastboot to get the device operational again... Then look at TWRP, root, or custom ROM.

acejavelin said:
At this point I would flash the stock Nougat image via fastboot to get the device operational again... Then look at TWRP, root, or custom ROM.
Click to expand...
Click to collapse
so should I just straight up flash the nougat image via fastboot from your thread here? https://forum.xda-developers.com/moto-x-style/general/xt1575-moto-x-pure-edition-factory-t3704142
i dont need to go back to mm stock or something first? I don't really have much knowledge about this.

OppaiHeroStar said:
so should I just straight up flash the nougat image via fastboot from your thread here? https://forum.xda-developers.com/moto-x-style/general/xt1575-moto-x-pure-edition-factory-t3704142
i dont need to go back to mm stock or something first? I don't really have much knowledge about this.
Click to expand...
Click to collapse
Correct... And verify everything is working properly before you flash TWRP, root, or take any OTA update.

acejavelin said:
Correct... And verify everything is working properly before you flash TWRP, root, or take any OTA update.
Click to expand...
Click to collapse
so i finished flashing that nougat firmware and looks like everything is working ok, does that mean I can try flashing custom roms after twrp now?

OppaiHeroStar said:
so i finished flashing that nougat firmware and looks like everything is working ok, does that mean I can try flashing custom roms after twrp now?
Click to expand...
Click to collapse
Boot TWRP (don't flash it) and make a full back, and I would recommend not talking any OTAs either.
Then knock yourself out... You can always get back to this state if things go badly.

acejavelin said:
Boot TWRP (don't flash it) and make a full back, and I would recommend not talking any OTAs either.
Then knock yourself out... You can always get back to this state if things go badly.
Click to expand...
Click to collapse
was finally able to flash a custom rom without bootloops!
thank you and everyone else here for the help I honestly really appreciate it

OppaiHeroStar said:
was finally able to flash a custom rom without bootloops!
thank you and everyone else here for the help I honestly really appreciate it
Click to expand...
Click to collapse
What custom did you flashed?

dzidexx said:
What custom did you flashed?
Click to expand...
Click to collapse
I tried out AICP, AOKP, and RR. All latest versions and they worked but for some reason my data doesn't work on any of those customs.
guess my happiness was short lol. Considering just staying stock now

OppaiHeroStar said:
I tried out AICP, AOKP, and RR. All latest versions and they worked but for some reason my data doesn't work on any of those customs.
guess my happiness was short lol. Considering just staying stock now
Click to expand...
Click to collapse
I'm not sure for others but RR - only 5.8.5-04.12 works with N modem.
Did you check/set access points properly?
All customs for N modem(I think) have problems with notification sound, so you can stay at stock.

dzidexx said:
I'm not sure for others but RR - only 5.8.5-04.12 works with N modem.
Did you check/set access points properly?
All customs for N modem(I think) have problems with notification sound, so you can stay at stock.
Click to expand...
Click to collapse
I'm using t-mobile and I've checked the access points, clicking on the one im using and hitting save doesn't fix it. Always getting a notification telling me to sign in to network. Not sure what else I can do. I'll give it a day since I had this kind of problem before when I switched sim cards and data didn't work until the next day
Edit - just went back to stock and my data doesn't work now either... just going to stay at RR now and hope my data fixes itself because my access point settings for tmobile should be correct since I looked it up on the official website..

Problems updating from 5.1.7 to 9

Hi,
I have a rooted OP5, running 5.1.7 and TWRP. I used Oxygen Updater to download the new android 9 ROM. I tried to install via TWRP, but got an error about zip compatability & a treble problem. I found a thread stating that I needed a newer TWRP to fix the treble problem, so I installed TWRP_3.2.3-Pie_siankatabg_OP5 , which said it had Pie support, from here:
https://androidfilehost.com/?fid=1322778262903996029
That worked fine, but when I tried to flash the 9 ROM, I got still got the same error. Another post said to remove compatibility.zip from the ROM zip. I did that, and it now installed, but it wouldn't boot. Re-flashing 5.1.7 booted fine. I tried another TWRP - twrp-3.2.3-0-20181227-codeworkx-nocompatcheck-cheeseburger from here:
https://forum.xda-developers.com/on...overy-twrp-3-2-1-0-oreo-oxygenos-5-0-t3725723
That installs, and boots to system, but won't boot to recovery, so I can't install the 9 ROM.
Any ideas where I go from here to upgrade to 9?
Thanks!

richstant said:
Hi,
I have a rooted OP5, running 5.1.7 and TWRP. I used Oxygen Updater to download the new android 9 ROM. I tried to install via TWRP, but got an error about zip compatability & a treble problem. I found a thread stating that I needed a newer TWRP to fix the treble problem, so I installed TWRP_3.2.3-Pie_siankatabg_OP5 , which said it had Pie support, from here:
https://androidfilehost.com/?fid=1322778262903996029
That worked fine, but when I tried to flash the 9 ROM, I got still got the same error. Another post said to remove compatibility.zip from the ROM zip. I did that, and it now installed, but it wouldn't boot. Re-flashing 5.1.7 booted fine. I tried another TWRP - twrp-3.2.3-0-20181227-codeworkx-nocompatcheck-cheeseburger from here:
https://forum.xda-developers.com/on...overy-twrp-3-2-1-0-oreo-oxygenos-5-0-t3725723
That installs, and boots to system, but won't boot to recovery, so I can't install the 9 ROM.
Any ideas where I go from here to upgrade to 9?
Thanks!
Click to expand...
Click to collapse
Hi, I got Pie to install with TWRP_3.2.3-Pie_siankatabg_OP5 on my device.
Go to this link:
https://forum.xda-developers.com/showpost.php?p=78523940&postcount=13
And follow my post on the part where it says:
" Notes for the Pie update: "
Let us know if those steps work for you. The firmware is linked to on there, pre-modified. Try flashing that pre-modified zip and see if your device boots.

richstant said:
Hi,
I have a rooted OP5, running 5.1.7 and TWRP. I used Oxygen Updater to download the new android 9 ROM. I tried to install via TWRP, but got an error about zip compatability & a treble problem. I found a thread stating that I needed a newer TWRP to fix the treble problem, so I installed TWRP_3.2.3-Pie_siankatabg_OP5 , which said it had Pie support, from here:
https://androidfilehost.com/?fid=1322778262903996029
That worked fine, but when I tried to flash the 9 ROM, I got still got the same error. Another post said to remove compatibility.zip from the ROM zip. I did that, and it now installed, but it wouldn't boot. Re-flashing 5.1.7 booted fine. I tried another TWRP - twrp-3.2.3-0-20181227-codeworkx-nocompatcheck-cheeseburger from here:
https://forum.xda-developers.com/on...overy-twrp-3-2-1-0-oreo-oxygenos-5-0-t3725723
That installs, and boots to system, but won't boot to recovery, so I can't install the 9 ROM.
Any ideas where I go from here to upgrade to 9?
Thanks!
Click to expand...
Click to collapse
It sounds like you did not follow the detailed flashing instructions in the first post here: https://forum.xda-developers.com/oneplus-5/how-to/official-oxygenos-4-5-2-7-1-1-ota-t3627003
Is your device storage encrypted or decrypted? Have you flashed magisk? Have you used an older magisk(your end link leads to my post where I mention that)? Have you downloaded the rom file without compatibility.zip or did you removed it on your own?

strongst said:
It sounds like you did not follow the detailed flashing instructions in the first post here: https://forum.xda-developers.com/oneplus-5/how-to/official-oxygenos-4-5-2-7-1-1-ota-t3627003
Is your device storage encrypted or decrypted? Have you flashed magisk? Have you used an older magisk(your end link leads to my post where I mention that)? Have you downloaded the rom file without compatibility.zip or did you removed it on your own?
Click to expand...
Click to collapse
Thanks for the links both, but still no go. I was on Magisck 17.1, uninstalled Magisk with the latest uninstaller, flashed the ROM with compatability.zip already removed. Same result as before - I get the oneplus logo, then it just reboots instead of starting the system. I've only wiped cache & dalvik, I don't really want to wipe more than that if I can help it - it is worth trying a system/vendor/data wipe? I recovered by flashing back to 5.1.7 (also updated to Magisk 18 while I was at it).
Any more ideas? One thing I find a little weird is that I'm on the @siankatabg TWRP, when I tried either the bluespark & codeworx TWPR, I couldn't get into recovery with either, I just got a blank screen with a LED staying on light blue. Only the siankatabg recovery works. Surely any of them should work? Does this point to a problem?
I'm not sure what you mean by encrypted or not - I get messages about unencrypting when going into recovery, which I assume means I am encrypted?
THanks!

richstant said:
Thanks for the links both, but still no go. I was on Magisck 17.1, uninstalled Magisk with the latest uninstaller, flashed the ROM with compatability.zip already removed. Same result as before - I get the oneplus logo, then it just reboots instead of starting the system. I've only wiped cache & dalvik, I don't really want to wipe more than that if I can help it - it is worth trying a system/vendor/data wipe? I recovered by flashing back to 5.1.7 (also updated to Magisk 18 while I was at it).
Any more ideas? One thing I find a little weird is that I'm on the @siankatabg TWRP, when I tried either the bluespark & codeworx TWPR, I couldn't get into recovery with either, I just got a blank screen with a LED staying on light blue. Only the siankatabg recovery works. Surely any of them should work? Does this point to a problem?
I'm not sure what you mean by encrypted or not - I get messages about unencrypting when going into recovery, which I assume means I am encrypted?
THanks!
Click to expand...
Click to collapse
Maybe try backing your device up, and then locking the bootloader. Try updating with stock recovery on a locked bootloader. If that works, you can then unlock the bootloader and copy your data back

richstant said:
Thanks for the links both, but still no go. I was on Magisck 17.1, uninstalled Magisk with the latest uninstaller, flashed the ROM with compatability.zip already removed. Same result as before - I get the oneplus logo, then it just reboots instead of starting the system. I've only wiped cache & dalvik, I don't really want to wipe more than that if I can help it - it is worth trying a system/vendor/data wipe? I recovered by flashing back to 5.1.7 (also updated to Magisk 18 while I was at it).
Any more ideas? One thing I find a little weird is that I'm on the @siankatabg TWRP, when I tried either the bluespark & codeworx TWPR, I couldn't get into recovery with either, I just got a blank screen with a LED staying on light blue. Only the siankatabg recovery works. Surely any of them should work? Does this point to a problem?
I'm not sure what you mean by encrypted or not - I get messages about unencrypting when going into recovery, which I assume means I am encrypted?
THanks!
Click to expand...
Click to collapse
Please use an older recovery like twrp-3.2.3-0-20181031-codeworkx-cheeseburger.img the actual pie recoveries require pie firmware(mentioned in last post of blue spark thread for example).

strongst said:
Please use an older recovery like twrp-3.2.3-0-20181031-codeworkx-cheeseburger.img the actual pie recoveries require pie firmware(mentioned in last post of blue spark thread for example).
Click to expand...
Click to collapse
OK, I understand now - if I use an older TWRP, or the siankatabg version, it works fine. I can then flash the Pie ROM, however it still won't boot - I get the oneplus logo, then it just reboots. However having done the Pie flash, I can then flash the more recent TWRPs (codeworx or Bluespark), and can now get into recovery fine. However Pie still won't boot - I've even tried re-flashing the Pie ROM from within the newer TWRPs, but the result is the same - it gets to the oneplus logo, then reboots. At this stage I guess wiping system/vendor/data is the only way forwards?
*Edit* - OK, so wiping everything fixed the issue, I'm now on Pie. Flashing Magisk didn't work when flashing the ROM, but I'll try again once it's finished downloading all my apps etc.

Phone stuck at Decryption unsuccessful :crying:

I am stuck at encryption failed when I flash stock oreo rom. I tried formatting data using twrp and flashed no encryption file as well but nothing works.:crying::crying::crying:
I just want to use the stock oreo rom again with root.
Pls help:crying:

Which ROM did you try and flash / install?
Try upgrading your TWRP to the latest version too.

jl10101 said:
Which ROM did you try and flash / install?
Try upgrading your TWRP to the latest version too.
Click to expand...
Click to collapse
I used partition dl mode to flash the stock oreo rom over 7.0 to keep the root. Then i flashed custom kernal for stock 8.0 but it didnt work. I have done the same procedure before and it has worked like a charm. But it keeps on giving the encrytion error when i try it now

Deadmeat03 said:
I used partition dl mode to flash the stock oreo rom over 7.0 to keep the root. Then i flashed custom kernal for stock 8.0 but it didnt work. I have done the same procedure before and it has worked like a charm. But it keeps on giving the encrytion error when i try it now
Click to expand...
Click to collapse
Odd. If I had to guess anything, it would be that not all the partitions were flashed when going from Nougat to Oreo.
I once flash a Nougat ROM from an Oreo ROM and I had the same encryption issue and lost everything.
That was the last time I would trust myself again and not do a backup.

Flash stock recovery from KDZ through patched LGUP & do a factory reset .
After stock recovery completes the wipe do a battery pull, flash TWRP via fastboot, format data, flash Kernel & Magisk & you should be back on track...

Prowler_gr said:
Flash stock recovery from KDZ through patched LGUP & do a factory reset .
After stock recovery completes the wipe do a battery pull, flash TWRP via fastboot, format data, flash Kernel & Magisk & you should be back on track...
Click to expand...
Click to collapse
I tried that as well. With stock recovery is says data is corrupted and doesn't do anything. I think it might be a problem with patched lg up because when i use normal lg up to flash oreo it works. But I cant root then.

I would try changing to 3.2.3-4 TWRP and then trying the procedure again. It seems that the 3.3.0 TWRP does not decrypt properly sometimes.

In the same boat as OP
scottyrick said:
I would try changing to 3.2.3-4 TWRP and then trying the procedure again. It seems that the 3.3.0 TWRP does not decrypt properly sometimes.
Click to expand...
Click to collapse
Hi
Looking for a way to keep TWRP and root ... any help appreciated
I've got a US996 with the same issue as the op. I have the latest TWRP 3.3.1-0. The phone was working fine until I upgraded twrp but I might have done a mistake resetting phone outside of twrp.
I can still get back into twrp but I haven't been able to install zip files without getting that decryption unsuccessful message when booting to system.
When getting back into TWRP using hardware buttons sometimes there is a prompt asking "keep system read only?" which I never chose and swipe to allow modification. I think this happens after
I pull the battery after getting the decryption unsuccessful message. There is a reset system that I could chose under the decryption unsuccessful message but I'm assuming that will make me lose twrp
...but if my phone is a us996 and is still
unlocked, would it matter if I did select it? Wouldn't I be able to reinstall twrp using adb again on a computer after Oreo is reinstalled?
To do Prowler_gr's suggestion which guide do I follow (sounds like I should do the second option)
"Flash stock recovery from KDZ through patched LGUP & do a factory reset .
After stock recovery completes the wipe do a battery pull, flash TWRP via fastboot, format data, flash Kernel & Magisk & you should be back on track... "
1-[GUIDE][UNBRICK] Patch LGUP to unlock features & unbrick V20 (Variant mismatch fix) to use lgup
or this guide
2-Ultimate guide to unbrick LG V20(Only Variants with .KDZ)[No OS Firmware Update Loop]
Thank you for any guidance on this...

There is a reset system that I could chose under the decryption unsuccessful message but I'm assuming that will make me lose twrp
Click to expand...
Click to collapse
Don't blame me if this goes wrong but I'm pretty much 100% certain that you mush press the rest button. This has happened to me a few times I'm sure. You won't loose twrp. Whatever resetting goes on in the background I don't think it's an actual Factory Reset.
Edit: Just to be clear you taking about a white screen with I think in dark blue or black text ENCRYPTION UNSUCCESSFUL and something like "reset phone" option directly under it, on the upper half of the screen?

Hi ezzony
Yes you are thinking of the right decryption unsuccessful page. I get it when booting to system
after installing Oreo and magisk 19 and having wiped everything (format data too). I will get the exact wording of it tonight
Thanks!

downgrade twrp i has same prob twrp 3.3.1 gives issues

ghet2rockuu said:
downgrade twrp i has same prob twrp 3.3.1 gives issues
Click to expand...
Click to collapse
Hi ghet2rockuu
I downgraded twrp and that got it working Thank You! see also Phoenix591 thread [Recovery][Unofficial for the moment]TWRP 3.3.1-0 : 2019-05-17 #625
Thank You !

OnePlus 6t Wifi Issue on custom roms

Okay so I've tried Pixel experience, lineage os , omni rom treskmod and couple of other custom android 10 roms, all stable and official and also updated ones, the wifi just simply doesn't work, wifi hotspot won't turn on either. I've tried every solution on the internet. I've even factory reset my phone using msm download tool and no luck(did this countless times).
I'm back in OOS 10.3.2 and there's no issue apparently.
At one point , i flashed a custom rom and the wifi didn't work, so I flashed OOS in the two slots and checked , the wifi works in OOS apparently, and never in custom roms.
Has anyone got this issue before and knows a solution?

How is your installation procedure?

onliner said:
How is your installation procedure?
Click to expand...
Click to collapse
I flash OOS and twrp on both slots, reboot recovery,
And then flash the rom and twrp, reboot recovery,then format data and factory reset, reboot recovery, if needed for some gapps, then reboot system

ivanthomas said:
I flash OOS and twrp on both slots, reboot recovery,
And then flash the rom and twrp, reboot recovery,then format data and factory reset, reboot recovery, if needed for some gapps, then reboot system
Click to expand...
Click to collapse
That's a lot of unnecessary steps. OOS on both slots, reboot to bootloader, boot twrp, format data and flash the custom rom, reboot bootloader, boot twrp and flash gapps, don't install twrp permanently if you are not going to install Magisk.

onliner said:
That's a lot of unnecessary steps. OOS on both slots, reboot to bootloader, boot twrp, format data and flash the custom rom, reboot bootloader, boot twrp and flash gapps, don't install twrp permanently if you are not going to install Magisk.
Click to expand...
Click to collapse
I need magisk too, I usually permanently install twrp
Also you think it's the way I'm installing at fault here? Or the rom? Or is it something wrong with my device?

ivanthomas said:
it's the way I'm installing at fault here?
Click to expand...
Click to collapse
This.
I always install roms with the procedure i said above and have never had any problems.

onliner said:
This.
I always install roms with the procedure i said above and have never had any problems.
Click to expand...
Click to collapse
Alright so got one doubt, I used OOS 10.3.2 to flash, should it be oos 10.0 only?
Thought that didn't make a difference.

I am also facing the same issue. Were you able to find any solution ?

So I found out treskmod omni rom and Paranoid android quartz 2 work perfectly , try those out, it still doesn't solve the problem in the other roms though. So not exactly a solution.

Flash a Custom Rom in 2020?

For the past 24+ hours I've been trying to flash a few custom roms on my UNLOCKED BOOTLOADER OP6T, but the phone TURNS OFF a few seconds after the boot sequence/animation.
I've read about the A/B slots and tried the Roms' flashing instructions, along with a few suggestions from others, but I cannot get any Custom Rom on my phone...
Here are the steps I've taken to flash (a few times I tried different things that I'll put in parenthesis). Is there anything ya'll see that I'm doing wrong?:
Starting from OOS 10.3.2 Fastboot Recovery and all required files on an OTG USB Drive
fastboot to TWRP....img
Confirmed I'm on Slot A
Wipe Data/Dalvik
Install OOS...zip (10.3.2)
Install TWRP...zip (3.3.1.32)
Reboot Recovery
(Format Data)
Confirmed I'm on Slot B
Install OOS...zip (10.3.2)
Install TWRP...zip (3.3.1.32)
Reboot Recovery
Confirmed I'm on Slot A
Install Xtended (v8 4/13)
(Wipe Data/Cache)
Install TWRP...zip (3.3.1.32)
Reboot Recovery
Confirmed I'm on Slot B
Install Xtended (v8 4/13)
(Wipe Data/Cache)
Install TWRP...zip (3.3.1.32)
Reboot Recovery
Confirmed I'm on Slot A
Install GAPPS (Arm64 10.0 Nano)
(Format Data)
Reboot System

My Guide for Lineage, however it will work for most AOSP based ROMs.
I assume you arent manually switching slots. Don't, there is no need, in fact dont worry about it. Slots will switch automatically after flashing a ROM when you reboot recovery. There is no cache partition, stop wiping this, its not doing anything. There are two slots, but only one data partition that is shared, there isnt a reason to keep wiping it.
On most instructions adding or removing steps will make things not work. Unfortunately for this device there is a lot of out dated information and information that just doesnt work. My guide has been tested with 10.3.3, and the latest version of LOS, however if you have a T-Mobile 6T you are on your own. (I have a regular 6T)

OhioYJ said:
My Guide for Lineage, however it will work for most AOSP based ROMs.
I assume you arent manually switching slots. Don't, there is no need, in fact dont worry about it. Slots will switch automatically after flashing a ROM when you reboot recovery. There is no cache partition, stop wiping this, its not doing anything. There are two slots, but only one data partition that is shared, there isnt a reason to keep wiping it.
On most instructions adding or removing steps will make things not work. Unfortunately for this device there is a lot of out dated information and information that just doesnt work. My guide has been tested with 10.3.3, and the latest version of LOS, however if you have a T-Mobile 6T you are on your own. (I have a regular 6T)
Click to expand...
Click to collapse
Thanks for the comment! I just followed your guide, but still seeing the boot animation for a few seconds, then the phone vibrates and turns off.
For kicks, I decided to Format Data and I see the boot animation longer, all the way to the end when it's about to start Android, but then it vibrates and shuts off. Strange.
I'm thinking there is something different about my phone... It's a global, unlocked version and I've rooted/flashed hundreds of roms over the years on various devices, so all of this should be a piece of cake................. Thanks!

oooscasianooo said:
Thanks for the comment! I just followed your guide, but still seeing the boot animation for a few seconds, then the phone vibrates and turns off.
For kicks, I decided to Format Data and I see the boot animation longer, all the way to the end when it's about to start Android, but then it vibrates and shuts off. Strange.
I'm thinking there is something different about my phone... It's a global, unlocked version and I've rooted/flashed hundreds of roms over the years on various devices, so all of this should be a piece of cake................. Thanks!
Click to expand...
Click to collapse
Have you tried without Gapps?

After the shutdown go back to twrp and extract the content of /sys/fs/pstore/* and upload the files here.

onliner said:
After the shutdown go back to twrp and extract the content of /sys/fs/pstore/* and upload the files here.
Click to expand...
Click to collapse
Thanks. I actually gave up and setup stock OOS again, so it took a while to get a TWRP backup, etc. etc.
So after the backup, I installed Xtended + TWRP, reboot to recovery, installed Xtended + TWRP, wiped dalvik, and reboot to system.
Boot animation shut down issue as usual.
Afterwards, I copied the pstore folder (attached zip).
Thanks!

onliner said:
After the shutdown go back to twrp and extract the content of /sys/fs/pstore/* and upload the files here.
Click to expand...
Click to collapse
Anything in the logs I can look for?
This is driving me crazy. I flashed MIUI just fine (because it had the .bat file that does everything for you). Essentially it's doing the same thing as flashing OOS & Rom on A/B, right?
Just tried flashing the newest Xtended Rom (May 11th), same issue. Phone vibrates and completely turns off while the boot animation is running.

OhioYJ said:
My Guide for Lineage, however it will work for most AOSP based ROMs.
I assume you arent manually switching slots. Don't, there is no need, in fact dont worry about it. Slots will switch automatically after flashing a ROM when you reboot recovery. There is no cache partition, stop wiping this, its not doing anything. There are two slots, but only one data partition that is shared, there isnt a reason to keep wiping it.
On most instructions adding or removing steps will make things not work. Unfortunately for this device there is a lot of out dated information and information that just doesnt work. My guide has been tested with 10.3.3, and the latest version of LOS, however if you have a T-Mobile 6T you are on your own. (I have a regular 6T)
Click to expand...
Click to collapse
If you have a TMobile 6t I can confirm I have had to manually change the slots during the flashing process to get custom ROMs installed.

mrmcshagbag said:
If you have a TMobile 6t I can confirm I have had to manually change the slots during the flashing process to get custom ROMs installed.
Click to expand...
Click to collapse
I found out that I do have the T-Mobile version that the seller flashed to International Software haha
When I reboot to recovery, I do see that the slots are being changed though.
Would you mind post the exact steps you took to successfully flash a ROM/GAPPS?

oooscasianooo said:
I found out that I do have the T-Mobile version that the seller flashed to International Software haha
When I reboot to recovery, I do see that the slots are being changed though.
Would you mind post the exact steps you took to successfully flash a ROM/GAPPS?
Click to expand...
Click to collapse
Fastboot boot TWRP Marion version
Flash oos
Flash Marion TWRP zip
Check my slot
Reboot recovery
Changed slot since it didn't change
Reboot recovery
Flash oos
Flash Marion TWRP zip
Changed slot
Reboot recovery
Flash custom rom
Flash Marion TWRP zip
Change slot
Reboot recovery
Flash gapps
Flash magisk 20.4
Reboot to system
Those are the steps I had to take before I finally got a custom rom to work. I tried doing the methods posted which would have probably worked if the slots were changing on there own but they weren't for me.

mrmcshagbag said:
Fastboot boot TWRP Marion version
Flash oos
Flash Marion TWRP zip
Check my slot
Reboot recovery
Changed slot since it didn't change
Reboot recovery
Flash oos
Flash Marion TWRP zip
Changed slot
Reboot recovery
Flash custom rom
Flash Marion TWRP zip
Change slot
Reboot recovery
Flash gapps
Flash magisk 20.4
Reboot to system
Those are the steps I had to take before I finally got a custom rom to work. I tried doing the methods posted which would have probably worked if the slots were changing on there own but they weren't for me.
Click to expand...
Click to collapse
Thanks! Do you mean the "mauronofrio" version?

oooscasianooo said:
Thanks! Do you mean the "mauronofrio" version?
Click to expand...
Click to collapse
Yes couldn't remember the exact name but I knew you would be able to find it haha

mrmcshagbag said:
Yes couldn't remember the exact name but I knew you would be able to find it haha
Click to expand...
Click to collapse
hahaha thanks! I was thinking, "is there a T-Mobile version of TWRP?!" haha!