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Hi Guys,
I got into a problem here, and I need help! I have a milestone 2 with the latest Endlees CyanogemMod, Android 2.3.7.
I was trying to follow the steps into using the internal memory as a SD card (link http://forum.xda-developers.com/showthread.php?t=948887), but I wasn't successful.
Here cames what I did:
First I tried to follow the steps:
1- create a file image in /data and a folder in /sdcard
mkdir /sdcard/storage
su
dd if=/dev/zero of=/data/storage.img bs=1024 count=5242880 (1024x1024x5 --> 5Gb)
busybox mkfs.vfat /data.storage.img
But that didn't work, the terminal emulator just said that the directory couldn't be found.
Then I downloaded Busybox from Android Market, and installed it. But when I executed the program, the installation wasn't done because it was insisting that Busybox wasn't able to access the folder, and didn't have superuser access to root. Even with the permission on Superuser OK!
So after that, I tried to reboot my milestone 2, and now it won't even get to the boot screen of android (screen with the rotating square)
I tried to use the boot recovery tool, and wipe all system data, and reboot, mas it isn't working. Something I noticed on Recovery Tool is that apear a messagem saying "E: Can't Open /cache/recovery/command" and "E: Can't Open /cache/recovery/caller.
Even the battery light won't turn on. If turn off the cell and try to recharge it, appears a image of the battery with a "?" on it... I tried to connect the cellphone to the PC with the usb cable, but it isn't recognized...
I hope someone can help me, I just can't afford to lose this phone.... Thanks
Look in this topic http://forum.xda-developers.com/showthread.php?t=1344740 it should help you solve this problem
in general: firstly you need to charge your battery in another working Milestone 2 or in some universal battery charger (because bricked Milestone 2 is not able to charge battery) and then you need to flash SBF and it should be ok
Anonymous_ said:
Look in this topic http://forum.xda-developers.com/showthread.php?t=1344740
in general: firstly you need to charge your battery in another working Milestone 2 or in some universal battery charger (because bricked Milestone 2 is not able to charge battery) and then you need to flash SBF and it should be ok
Click to expand...
Click to collapse
I read somewhere else that even if the MS 2 is bricked the battery charges. Very very slowly, but it charges.
thanks for your tip... I read the entire topic, but there is a problem. My battery must be around 30% or something, but when a connect the milestone 2 with the pc via usb cable, the lateral light won't even lit... And the pc won't even recognize it...
edit: when I connect the cellphone to the pc, the light lit for 30s more or less, the appear the Motorola logo with the rabbit on the side, but then the light turn off and I get stuck in the same situation...
carpet55 said:
I read somewhere else that even if the MS 2 is bricked the battery charges. Very very slowly, but it charges.
Click to expand...
Click to collapse
I don't know, maybe it is possible, but I as far as I know, everyone, who had bricked M2, charged the battery outside his phone...
So he can try it in the bricked phone, but he can't be 100% sure it will charge, right?
colucci.ti said:
thanks for your tip... I read the entire topic, but there is a problem. My battery must be around 30% or something, but when a connect the milestone 2 with the pc via usb cable, the lateral light won't even lit... And the pc won't even recognize it...
edit: when I connect the cellphone to the pc, the light lit for 30s more or less, the appear the Motorola logo with the rabbit on the side, but then the light turn off and I get stuck in the same situation...
Click to expand...
Click to collapse
Yes, thats why I said here and even in the topic I referred to, you have to charge battery in another non-bricked Milestone 2 or in universal battery charger. When your M2 is bricked, it wont charge any battery (or maybe it will, but very very slow according to carpet55's post ).
So now you have to get some universal charger or working M2 (or another battery).. This is your step no. 1. Then you can flash it via RSDLite by SBF file.
ok Anonymous_!
I'm going to find a way to charge the battery and do what are you saying.
But RDS Lite can flash the android even if windows it isn't recognizing the cell phone on the usb?
thanks again! I'll return with more info when I get my battery fully charged..
After you will have charged battery, you will have to boot into bootloader by holding Power+Volume Down+Camera button, then windows should recognise it (maybe you will have to install drivers too) and then you can use RSDLite (don't forget to run it with administrator rights).
Anonymous_,
final question of the day... Where do I get the SBF file?
I'm from Brazil, so should be the brazillian version of this link?
and-developers.com/sbf:milestone2
You are on the right path
Grab Brazil 2.2 version from http://and-developers.com/sbf:milestone2 and it should be ok.
I can confirm that no, the battery does not charge when bricked. I left mine going for over 24 hours and nothing -_-. So ended up using a universal ac adapter set to 5 volts and some wires directly to the + and -. This didn't work after half an hour so I upped it to 7v and about ten minutes later, all good.
During my research to find how to fix it, someone was saying the charge sequence software in in the system or boot data, and since it was all corrupt - no charge.
But you perhaps allready have enough juice in there to load up bootloader successfully, so try what anon said and hold d-pad up and power on until the screen flashes blackish grey and let go. Then it'll tell you if the battery has enough charge to flash a sbf
Sent from my A953 using xda premium
Guys,
I'm thankful to everyone who tried to help me, especially Anonymous_!
Yesterday, in the same day I bricked my phone, I flashed it even without charging to 100%... and everything has gone well, but it was a close call, because my battery had only 5% left when the milestone returned to live!
Good to hear!
Sent from my A953 using xda premium
Hi everyone,
today I've solved my problem (http://forum.xda-developers.com/showthread.php?t=1567301), but my recovery...is brake! When I boot into recovery, there is an exclamation point...I can wipe data/cache and use zip file from sd. Stop...nothing else!
Like this....I can flash with another rom? Or maybe my recovery is "damaged"?
Sorry for my poor english...
kaiserxol said:
Hi everyone,
today I've solved my problem (http://forum.xda-developers.com/showthread.php?t=1567301), but my recovery...is brake! When I boot into recovery, there is an exclamation point...I can wipe data/cache and use zip file from sd. Stop...nothing else!
Like this....I can flash with another rom? Or maybe my recovery is "damaged"?
Sorry for my poor english...
Click to expand...
Click to collapse
I think you're in stock recovery. What you need is install 2nd-init for the custom recovery and all it's features onboard...
Thanks for your reply!
I've tried to install 2nd-init (the stable, not the latest) and all it's ok...if I restarted my phone e try to enter to recovery mod, I see an Android BootMenu ( ) and I can choose stock recovery and custom recovery. If i start the custom it retunr this message:
Code:
Start Custom Recovery...
E:Can't run /system/bootmenu/script/recovery.sh (No such file or directory)
So confused....
Something braked with che CM9 kernel? If I start the stock recovery...I see the imaged attached in this post.
Boot normally into CM9. Open 2nd init and uninstall Bootmenu, then re-install bootmenu but chose "Latest - 1.0.7", not "Stable - 0.6.7"
Boot menu 1.0.7 is available with latest Sndinit2.0 version, get that sol from dev section and then install boot menu.
Sent from my MB526 using XDA App
Thanks to everyone!
Now I'n with the 1.0.7...I have the same image on the recovery this is strange!
I've tried to flash with che CM9, but the install aborted with this message:
Code:
E:failed to verify whole-file signature
E:signature verification failed
Installation aborted
EDIT: the same error with my CM7.2
I'm coming from a 7.2 NIGHTLY (cm72-120127.0846-NIGHTLY-Defy+). I've tried to install the CM9 from this link http://forum.xda-developers.com/showthread.php?t=1432100 (I've used the Quarx rom). After this my Defy+ wan unable to boot (black screen). After a few of stock rom I'm back to the default rom (the spanish version, not the italian...it doesn't work ). I would like to flash the CM9, but first I think there is a problem with the recovery...why it displayed the image with the alert? Another question...with the CM7 my recovery have got a lot of option...now I've: reboot/apply update from sd/wipe data/factory reset/wipe cache. Is it normal?
What the hell I've done?
Most likely you're trying to flash unsigned ZIPs and the recovery wants signed ones, or trying to flash what should be extracted as "backup" and restored. You can turn off signature checking in recovery, if you know that you're flashing correct ZIPs and they're unsigned.
The stock recovery ALWAYS displays an image with the alert, because you can NEVER change it, until Defy bootloader will be unlocked (if it'll ever happen). Nothing strange about it.
I was able to use recovery and I tried to reinstall the CM9, but now my phone looks dead! No boot, no boot error, no recovery...nothing! Black screen. If I plug the phone to my pc...RDS Lite does't recognized the Defy. I would try to flash the sbf and come back to the 7.2 NIGHTLY...but how?
Damn...I'm so sad for this I'm hope there is a workaround...
kaiserxol said:
I was able to use recovery and I tried to reinstall the CM9, but now my phone looks dead! No boot, no boot error, no recovery...nothing! Black screen. If I plug the phone to my pc...RDS Lite does't recognized the Defy. I would try to flash the sbf and come back to the 7.2 NIGHTLY...but how?
Damn...I'm so sad for this I'm hope there is a workaround...
Click to expand...
Click to collapse
Did you press vol up and power??! You need to go to program mode for RSD lite to recognise your phone! It may have been that you flashed CM9 for Defy instead of CM9 for Defy+!! By no recovery do you mean you can't go even to stock recovery?!(Sounds almost impossible!)
Power and Vol+/Vol- doesn't work for me. Only the white led (charging status) works if I plug the usb cable to my pc. RDS
You need to go to program mode for RSD lite to recognise your phone!
Click to expand...
Click to collapse
I didn't understand what to do...
I start normally the RDS Lite...normally I see my phone automatically, now...nothing happened
kaiserxol said:
Power and Vol+/Vol- doesn't work for me. Only the white led (charging status) works if I plug the usb cable to my pc. RDS
I didn't understand what to do...
I start normally the RDS Lite...normally I see my phone automatically, now...nothing happened
Click to expand...
Click to collapse
Normally these steps are followed to flash SBF:
1.) go to bootloader mode (Vol up + power button. That's the program mode I was talking about)
2.) Now RSD lite will recognise your phone.
3.) Flash from RSD lite.
Are you saying that Vol up + power button = nothing happening in your phone? Not even black screen with
Bootloader .... blah blah
USB
Battery OK
Ready to program
????
If that's the case:
1.) Battery not charged.
2.) Go claim warranty!
Yes...this case! I know the bootloader screen
Code:
Bootloader .... blah blah
USB
Battery OK
Ready to program
but this time nothing...
Mhh...maybe the battery is near the 0% and the usb from a pc doesn't charge the phone? The led is white...but nothing. Maybe with the AC power?
kaiserxol said:
Power and Vol+/Vol- doesn't work for me. Only the white led (charging status) works if I plug the usb cable to my pc. RDS
I didn't understand what to do...
I start normally the RDS Lite...normally I see my phone automatically, now...nothing happened
Click to expand...
Click to collapse
Charge your battery... In another Defy phone, NOT McGyver method as many have already fried their batteries, using this trick!
I don't have another Defy for try this! I will try tonight at home, with the other cable connected directly to AC, and not to my pc. I hope it's work
No matter what cable you will try. At the moment your phone is not charging the battery. In order to start charging, you need to reflash it. And in order to reflash it, you need to get your battery charged... Sweet, ha? Get a buddy with a Defy to charge your battery and then reflash the phone.
Wow...this is a problem for me. Nobody have this phone and in Italy is not so much widespread...nobody know it :-(
kaiserxol said:
Wow...this is a problem for me. Nobody have this phone and in Italy is not so much widespread...nobody know it :-(
Click to expand...
Click to collapse
Then get to Amazon.com and buy a docking station with external battery charger if you dont want to use mc guyver, thats was my backupplan if I'm too stupid to use it... well mac guyver worked for me, 5 min charging and everything was fine xD
Here is an example
http://www.amazon.com/Fosmon®-Premi...9TVM/ref=sr_1_1?ie=UTF8&qid=1333017207&sr=8-1
It's hard to use the McGyver method? I'm a little bit scared to do this...but if it works to you...i will try
kaiserxol said:
It's hard to use the McGyver method? I'm a little bit scared to do this...but if it works to you...i will try
Click to expand...
Click to collapse
It worked like charm, battery is fine, i was able to flash a new rom...
One Usb-Cable "broken" but well who cares.
But if you try it, you need to be very very veeery careful.
Friend of mine is Hifi-Electrician and i had a little help from him, for testing which wires are the right ones to connect.
You have to be aware, that this could kill your battery and you need to buy a new one.
But once, everything is connected the right way, you also need to know that there is no safety or fuse or whatever, that safes your battery, so dont put it on too long, in my case, it took about 5 to ten minutes for 50-70% of battery, so dont let it be connected too long.
And one last thing, make sure, that there is no possibility for the cables to hit any other connector(?) on the battery, use some kind of tape, to make them stay in there position.
If your still willing to try this, good luck to you, as I say, this works. I dont know which MC Guyver you like to try, but i would recommend the batterycharge only, so not connected to the phone, version.
But think about this docking station too, its way more comfortable, easier, less dangerous, and amazon is really fast in shipping, so it would probaply just take 1-2 days.
I fuound this in the forum
http://forum.xda-developers.com/showthread.php?t=892026
I think it's the best way...or not?
Thanks
EDIT: can I use the usb cable from a pc? Or I need to plug the cable directly into the AC power?
Hey guys!
Yesterday I made a big mistake in the afternoon. I hate myself and don't know what to do now.
I was tired and without concentration so i flashed the nexus 7 franco kernel r38 on my nexus 4 :'(
Now my nexus 4 won't boot up. It's completely shutdown and without AC charging nothing happens.
With plugged in AC power supply module after pressing volume down and power on for 11 sec the red led lights up once for a short time.
If the nexus 4 is connected to the computer with usb the device manager shows me a unknown device 'QHSUSB_DLOAD'.
I have no possibility to go to fastboot mode or recovery. There is only a BlackScreen!
Is there a possibility to make my mistake undo?
If read a lot of threads for now and found solutions (UnBrickableResurrector) for the Galaxy Nexus S but there is nothing for the nexus 4.
Thank you for you help!
chris_te said:
Hey guys!
Yesterday I made a big mistake in the afternoon. I hate myself and don't know what to do now.
I was tired and without concentration so i flashed the nexus 7 franco kernel r38 on my nexus 4 :'(
Now my nexus 4 won't boot up. It's completely shutdown and without AC charging nothing happens.
With plugged in AC power supply module after pressing volume down and power on for 11 sec the red led lights up once for a short time.
If the nexus 4 is connected to the computer with usb the device manager shows me a unknown device 'QHSUSB_DLOAD'.
I have no possibility to go to fastboot mode or recovery. There is only a BlackScreen!
Is there a possibility to make my mistake undo?
If read a lot of threads for now and found solutions (UnBrickableResurrector) for the Galaxy Nexus S but there is nothing for the nexus 4.
Thank you for you help!
Click to expand...
Click to collapse
Can you boot into fastboot? recovery?
Edit: Sorry, saw that you wrote you can't...
I added the information afterwards. Sry
Basically, there are two ways to fix this:
1) I don't know how, but through QHSUSB_DLOAD you probably can flash something...
2) JTAG Repair.
1) Sounds interessting. I thought at something like this: UnBrickable Resurrector
But is there a chance to get this solution to our nexus 4?
2) Nexus 4 - JTAG Brick Repair Service is also interessting but i don't know how much time it take vom germany to usa to germany back.
I thought the nexus 4 is unbrickable
If you got it into Download mode, then you should be able to get into recovery. (Assuming you didn't do a bad flash of that)
Unplug it
Hold volume down and power
Plug it into WALL CHARGER (not a computer) while still holding the buttons
Someone also flashed a Nexus 7 kernel (also Franco) to his Nexus 4. Didn't look good because the Nexus 7 kernel overwrites a partition from the bootloader, if I remember correctly. Here is it explained better. The last post from the guy who flashed it didn't look too good also. Sorry to hear man.
Maybe you can RMA it. I don't recommend it because it's your own fault, but everyone makes a mistake sometime sooner or later.
I am another one who did the same mistake - accidently flashed the franco Nexus 7 Kernel. ::crying:
Even the Qualcomm flash tool which I tried couldn't get acces to the device. So I'm waiting for my replacement device now and hope LG can fix the problem.
chris_te said:
Hey guys!
Yesterday I made a big mistake in the afternoon. I hate myself and don't know what to do now.
I was tired and without concentration so i flashed the nexus 7 franco kernel r38 on my nexus 4 :'(
Now my nexus 4 won't boot up. It's completely shutdown and without AC charging nothing happens.
With plugged in AC power supply module after pressing volume down and power on for 11 sec the red led lights up once for a short time.
If the nexus 4 is connected to the computer with usb the device manager shows me a unknown device 'QHSUSB_DLOAD'.
I have no possibility to go to fastboot mode or recovery. There is only a BlackScreen!
Is there a possibility to make my mistake undo?
If read a lot of threads for now and found solutions (UnBrickableResurrector) for the Galaxy Nexus S but there is nothing for the nexus 4.
Thank you for you help!
Click to expand...
Click to collapse
Sorry to hear your bootloader has been obliterated. Try to RMA via Google or contact LG and find out how much they will charge to flash the device.
On a side note, I'm curious if you're able to put the phone in to download mode (not fasboot or recovery).
1. Make sure it is off
2. Hold volume up + volume down and plug in USB.
Even if you can get to download mode I don't think we have what we need to get the device working (LG drivers, KDZ image, etc) but this would indicate some promise for the future.
Until the Qualcomm USB Dowland mode is figured out, you're boned. Gonna have to send it away.
comminus said:
On a side note, I'm curious if you're able to put the phone in to download mode (not fasboot or recovery).
1. Make sure it is off
2. Hold volume up + volume down and plug in USB.
Click to expand...
Click to collapse
Hi,
I tried your suggestion and it did't work
The phone tried to boot into download mode but didn't get it. Screen was always black. After 10 second the phone vibrated and tried it once more.
Do you think the people of MobileTechVideos can help me?
I'm still waiting for a response from Josh.
Here is a link to a Nexus 4 - JTAG Brick Repair Service video: http://www.youtube.com/watch?v=gYtNWt1h66E
And if all this does not work, i have to send it to the google RMA.
If it were me, I'd pay LG to fix it. Either contact Google for RMA or contact LG and ask them what they would charge to flash the device.
Sent from my Nexus 4
chris_te said:
Hi,
I tried your suggestion and it did't work
The phone tried to boot into download mode but didn't get it. Screen was always black. After 10 second the phone vibrated and tried it once more.
Do you think the people of MobileTechVideos can help me?
I'm still waiting for a response from Josh.
Here is a link to a Nexus 4 - JTAG Brick Repair Service video: http://www.youtube.com/watch?v=gYtNWt1h66E
And if all this does not work, i have to send it to the google RMA.
Click to expand...
Click to collapse
Just press VOL - key and plug into USB connected to PC, ARE YOU IN FASTBOOT MODE ?!
IF YES, flash stock firmwares... and let the device rest for 15 min.
then plug into AC charger and let it charge for min. 1 hour...
If nothing happens, you possibly damaged your battery !
I had the same issue... I sent it for RMA.. Although by this method, many have recovered, if there is no battery issue as such !
Give it a try !
And dont use toolkit... Use FASTBOOT COMMANDS ! MANUALLY !
You have to reach fastboot mode:
1) Turn the phone off!! Not so easy (for me when never done before)!! Unplug it and try to press power, it often needs a little time/serveral tries.
When off :good:- very important:
2) Hold volume - and power simultaniosly - and plug it into WALL CHARGER (not a computer) while still holding the buttons.
3) Fastboot Mode!!!? --> :laugh:
4) Plug it to PC and flash stock rom
Good luck!
torsin said:
You have to reach fastboot mode:
1) Turn the phone off!! Not so easy (for me when never done before)!! Unplug it and try to press power, it often needs a little time/serveral tries.
When off :good:- very important:
2) Hold volume - and power simultaniosly - and plug it into WALL CHARGER (not a computer) while still holding the buttons.
3) Fastboot Mode!!!? --> :laugh:
4) Plug it to PC and flash stock rom
Good luck!
Click to expand...
Click to collapse
The people who said the bootloader was overwritten are most likely right. Its done. This phone has the same processor as the s3 and on the s3 QHSUSB_DLOAD is the kiss of death.
QHSUSB_DLOAD=Qualcomm High Speed USB Download
Its basically a piece of hardware waiting for firmware to be loaded at a factory level. You need JTAG
billard412 said:
The people who said the bootloader was overwritten are most likely right. Its done. This phone has the same processor as the s3
Click to expand...
Click to collapse
btw: s3 is arm not qualcomm, but not important here.
Was referring to the us variants that also use the qualcomm snapdragon s4 processor like the n4 does
Ah, okay - sorry I don´t know!
And for the record, Qualcomm chips are ARM cores.
Also for the record, my JTAG solution for this model will recover a device that is hardbricked via bad software flash. In this case you have flashed a Tegra kernel into the device and likely also into the incorrect partition as well. I have a complete backup of all necessary zones required for boot (sbl's, aboot, boot, rpm, tz and a few others). If you've damaged your Nexus 4's bootable zones and the device is hard bricked due to it, I can repair it for you.
Hello everybody
I recently tried to higher the maximum headphone volume of my rooted LG G2 D802 on stock KitKat. In order to a guide I changed some values in the mixer_paths.xml in /systems/etc/ via ES File Explorer. After that, I restarted the phone which results in a bootloop - the LG boot animation never ends. I already found out that there is a high probability that the mixer_paths.xml is currupted due to wrong codings/line breaks or something.
Sadly, I neither can start the stock recovery (no custom recovery installed) by holding Power+Volume down nor go into download mode by volume up+putting usb cable in. In both cases it just happens nothing. When I connect it via USB to a PC, Windows recognizes a energy load only device. I tried different USB drivers/ports and PCs. There is no entry in the device manager and no new drives in the disk management utility.
I found hundreds of posts and comments where people coplaining that they can't go into download/recovery mode, even with apart from that fully working LG G2s. Therefore I'm not even sure, if both problems - the bootloop and not working download/recovery modes - are connected.
Is there any chance to get my G2 working again? I love it and don't want to buy a new phone.
I would be very thankful for everyone who can help me!
Hey
So I was flashing android 7.0 to an S8 and it completely died, this is how completely:
- No screen/LED/vibration motor
- No safety/recovery/download mode (and don't ask about button combos, I've tried them all)
- No USB recognition from device manager (not even as exynos in other devices, just nothing)
- USB jig does nothing
- It is however recognised by wireless chargers (but I doubt that has any real significance)
At this point my question is would a JTAG even work on it? Or is my only hope a complete motherboard replacement?
S8 Hard bricked
A_Bad_Marksman said:
Hey
So I was flashing android 7.0 to an S8 and it completely died, this is how completely:
- No screen/LED/vibration motor
- No safety/recovery/download mode (and don't ask about button combos, I've tried them all)
- No USB recognition from device manager (not even as exynos in other devices, just nothing)
- USB jig does nothing
- It is however recognised by wireless chargers (but I doubt that has any real significance)
At this point my question is would a JTAG even work on it? Or is my only hope a complete motherboard replacement?
Click to expand...
Click to collapse
hello!
same happened to me ......dont worry i will help u....
i think u flashed aosp rom
phone is not hard bricked its still not turned off believe me........
do the following:
donot charge phone for atlesat 24 hours .......
after 24 hours try to boot into download mode press button for like a minute it will work in multiple tries,,
immediately flash twrp and when flashed successfully suddenly press vol down + bixby + power it will boot into recovery
charge for 1 -2 hours , clear system and every thing if you have backup thats good other wise flash firmware......donot turn in till flashing the system and data in recovery mood......boot into download mood from recovery and there you go....if still a problem inbox me
Thanks, I'll give it a shot
ok let me know then
Jtag dead phone to life and rewrite IMEI
I had the same thing, sent it to Fonefunshop in England, they said they could fix it, the didn't even open it as discovered by the guys who fixed it and is necessary to use jtag.
Fonefunshop said eMMC chip was bad, which is not true, but that led me to search for someone to replace the chip. I found A2Z cellular in Ottawa, Canada. They got the phone to boot up, but IMMEI was null( I did this trying to flash back to stock after TWRP screwed up). They rewrote original IMEI , now phone works like new. These guys are amazing.
http://a2zcellular.com/
Thank you all for the advice.
But I have now managed to unbrick and reflash the firmware. khawarjaved's advice turned out to be what fixed it in the end.
That was close, nearly lost £30
A_Bad_Marksman said:
Thank you all for the advice.
But I have now managed to unbrick and reflash the firmware. khawarjaved's advice turned out to be what fixed it in the end.
That was close, nearly lost £30
Click to expand...
Click to collapse
I have been through that situation man.... So always ready to help, ??
Hi pros
I'm in kind of a similar situation....I think I flashed MY 950U PIE with wrong BL
This phone is dead....Doesn't boot...no download mode....No recovery mode....
When connected to pc....device manager Recognises device as QUALCOMM HS USB 9008
Any way to brig it back to life...?
Your phone is connected in edl download mod. It will accept special files which will allow it to boot to download mode and let you flash stock firmware
The tool used for this is emmcdl.exe
It has to come with phone specific files
No idea where to get it. Ask people here, those who root phones. They know.