Suddenly stuck in boot loop (official rom, unrooted) - Samsung Galaxy S7 Edge Questions and Answers

So i was simply updating youtube through google play, and messenger through messenger it self and suddenly the phone went into boot loop and can't get it out.
opening recovery mode is hard but when i managed to do it, it simply shows the android icon and installing system updates then restarts again. (tried it ~4 times). thanks to that i can't try clearing cache or any of that stuff on the list that is supposed to appear in recover mode.
trying force restart also does nothing.
trying to remove memory card and sim also didn't work.
i read that flashing HOME_CSC from a rom could fix it but the rom websites i know offer limited sizes and speeds and i don't have a strong internet which ends up timing out, can someone help me out? G935FOJV2ERGE is the one i need.
if you have any other ideas that can help, i would also greatly appreciate it, i really don't want to have to buy a new phone atm, and don't want to lose all my data because i don't used backup services cuz they ate up data .
edit: I am on latest official rom, only used OTA updates, haven't rooted the phone.
edit 2: i managed to get a different region's rom and flashed it's home_csc file, and force restarted it and seems to have worked booted, then it started doing it again just 1 second after that. i didn't even have time to unlock it.
edit 3: managed to get into recovery mode list once, wiping cache didn't work. couldn't get into recovery mode again after that. then i gave up and tried flashing a full rom. still the same problem.

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Phone restarts at startup.

Well this is my 1st post so first of all hey everyone
I just spent a week in Amsterdam and my phone restarted twice, different times different days and I dont remember what I was doing with it back then.
But as I landed back home I put the phone back from "Airplane Mode" and went on to toggle "Cellular Data" on.
The second I pressed the cellular data shortcut on my the phone restarted itself but this time whenever it would finish the screen would be on but fully black and sometimes it'll show battery precentage at the top but then will restart again in an infinite loop.
Sometimes it'll pop up the "Optimizing Apps" window and will go through all 24, upon finishing it will restart once more and do the same.
I tried using the bootloader and it worked (the bootloader that is) but the phone would do the same thing even after Rebooting from there or shutting down from there and then turning back on.
I contacted tech support on chat but they couldnt help past telling me to go to bootloader and reboot, said I should factory wipe when it failed.
Also tried wiping cache but to no avail.
I have no backup of my phone (wanted to do one before the flight but got lazy and I suck for not doing one sooner) since probably October and google doesnt backup my contacts properly for some unknown reason.
I already downloaded Android Studio with everything included for me to try using adb to sideload stock without wiping but its my first time and I couldnt get it to do anything at all...
I already got the official stock .gz file from the motorola website.
Anyway here are the specs to my phone:
XT1575
Everything is stock. didn't root or change recovery once in my life.
Was fully updated and had plenty of drive space (I have almost 128GB with the 64GB version + 64GB SD)
I'm really lost here so help will be very appreciated.
Thanks in advance,
-Noam
Start with a full wipe and if that doesn't work flash the stock image. Not sure what your question is though as you never really say. Once fixed I would unlock and make a backup so you don't have to deal with this again.
lafester said:
Start with a full wipe and if that doesn't work flash the stock image. Not sure what your question is though as you never really say. Once fixed I would unlock and make a backup so you don't have to deal with this again.
Click to expand...
Click to collapse
The thing I pretty much want to know is if theres a way to either backup the phone now with it connected to the computer while in bootloader or recovery. or a way to flash the stock rom without wiping which I read someone did with his tablet. I cant post source normally because I'm a new user so here it is but change spaces to dots: schnouki net/posts/2014/08/13/flashing-a-stock-android-image-without-wiping-user-data/
Also while in recovery I noticed 2 options under wipe: 1. userdata only. 2. userdata+(insert something I dont remember here) and I was wondering what gets deleted in both? if I delete only userdata what data will remain? something helpful?
Sure you can try flashing without wiping data but being locked I personally wouldn't risk it. No idea about backing up in your state... somewhere I remember a thread on backing up without root try searching in q&a.
lafester said:
Sure you can try flashing without wiping data but being locked I personally wouldn't risk it. No idea about backing up in your state... somewhere I remember a thread on backing up without root try searching in q&a.
Click to expand...
Click to collapse
Out of curiosity why shouldnt I try flashing with no wipe if ill lose the data anyway? worst case wont I just have to wipe after it fails and flash again?
And I will try thank you
Do you have any knowledge about the 2 wipe options?
Thanks in advance
Well I tried turning the phone on and it took a couple of minutes before loading to a fresh start. It apparently wiped itself on its own. Managed to restore almost everything.
Anyhow the phone takes too long to boot now. Was even stuck at boot and I had to restart it.
Anyway to fix my software? Or at least check for corruption?
Sent from my XT1575 using XDA-Developers mobile app

Help - G935A stuck on AT&T Logo - 3 vibrtations

For a week my G935A worked fine... direct out of the box I flashed ENG Kernel and Rooted, then installed apps and configured - no issues.
Today it was working then it hung on wake.. I tried to reboot and now it gets stuck at the AT&T logo and vibrates 3 times - over and over
I can get to Odin and Recovery screens easily so I tried to flash the ENG Kernel again & deleting Cache Partition few times - didnt fix it.
Also tried booting into Safe Mode - it never gets there, stays at AT&T logo.
When I go into the Recovery menu, I see at the bottom, in red... "dm-verity verification failed"
Anyone know how I can recover from this without Factory Reset? It took 6 hours to reinstall and config all my apps - really want to avoid that.
thx for the help!
as far as I know there is no way to fix and save your stuff. I had the same problem with G930A and even doing a factory reset would only allow my phone to boot but then I get apps crashing and then a reboot puts you back at ATT logo and the vibrates. Best to ditch the whole engboot and go back to stock until a more stable rooting method comes out.
Some searches shows posts that say using Odin to flash HOME_CSC without having to wipe and everything survive
... Where can I get HOME_CSC? I dl'd stock rom and dont see it in there.
thx!
Same here this morning on my 930A w/ PK1....went to watch a youtube vid and everything google related began crashing.
Only been on engboot for a couple days but did flash the v15 debloat last night. hmmmm.
Any luck with the files or procedure LivinOne?
Update: Flashed the PK1 CSC and got into recovery.
Wiped cache and reboot, same failure mode....sad face.
Flashed CSC again, into recovery, factory reset, wiped cache.
Back to setting my "new" device up.
Dec 30 update: Same crash, SEMI same problem.
I get the single vibration followed by the 3 vibrations after I put my pin in from a restart.
Same symptoms prior, all background activities began crashing.
Running all PK1 files from QRhinehardt post.
Any thoughts?
I ended up wiping and flashing the T-Mobile firmware and using the ENG bootloader (but not rooted yet). It is WAY faster than the AT&T was. I've only had issues with Wifi Calling (it doesnt seem to work most of the time)
s7 at&t
Hi, did you first flash with eng bootloader and then tmobile rom? I miss this step...I appreciate your help please
Single vibration followed by the 3 vibrations
Hi, were you able to fix the problem? I'm also getting the single vibration followed by the 3 vibrations.
Do you know why is this occurring? I performed a wipe cache and factory reset but still nothing.
bweegn said:
Same here this morning on my 930A w/ PK1....went to watch a youtube vid and everything google related began crashing.
Only been on engboot for a couple days but did flash the v15 debloat last night. hmmmm.
Any luck with the files or procedure LivinOne?
Update: Flashed the PK1 CSC and got into recovery.
Wiped cache and reboot, same failure mode....sad face.
Flashed CSC again, into recovery, factory reset, wiped cache.
Back to setting my "new" device up.
Dec 30 update: Same crash, SEMI same problem.
I get the single vibration followed by the 3 vibrations after I put my pin in from a restart.
Same symptoms prior, all background activities began crashing.
Running all PK1 files from QRhinehardt post.
Any thoughts?
Click to expand...
Click to collapse

Soft bricked data recovery

Hey all, been a while since I've been on - longest I've ever had a stock phone for . Hoping somebody can offer some advice as I'm stumped...
NOTE: If possible, I'm trying to avoid a factory reset!
Last night my stock UK Note 4 (SM-N910F) died (possibly during an OTA update but I wasn't using the phone and have been told it didn't so not sure) and when turned back on would just sit at the pulsing Samsung logo with no apparent restarting or anything. Clearing the cache didn't make a difference.
Recovery reported my ROM to be N910FXXS1DQE9 (region BTU). After waiting ages for the download, I first tried BTU-N910FXXU1BOC5 which produced the exact same problem with a different Samsung animation. I then tried BTU-N910FXXU1DQHC which seemed to sort of work - it would now boot but gave me a "Unfortunately, System UI has stopped" error with a black screen. I then flashed BTU-N910FXXU1DQH3 which is what I have running currently but this does the same thing. I did also try wiping cache in combination with the above (is this actually needed after flashing a new ROM?). I have also tried safemode - would let me open the power menu but otherwise did exactly the same thing.
I'm currently downloading the original ROM that wouldn't boot (N910FXXS1DQE9) from samsung-firmware but it's taking ages at ~50KBps. What are the chances of this working compared with the others, I assume probably not much? If likely, I'll pay up for an account and a quick download.
I've also tried flashing TWRP but I have reactivation lock on - does anybody know a way to disable / bypass this without access to the phone (research tells me probably not but there are a lot of smarter people than me here that I hope could tell me otherwise ). I can get into stock recovery but that only gives me ADB in sideload mode and I can also enter download mode fine obviously. Does anyone have any suggestions on recovering data from the phone before I factory reset?
Simply put, have I lost everything on the phone or is there a way I can retrieve some of it?
Also, I do have a load of server space I can offer with decent bandwidth - I have those ROM images above so I can offer these for download at a decent speed without a cost if anybody here on XDA needs - just send me a PM for a link

HELP: Encryption Unsuccessful TB-X104F

I i had to reflash the firmware the correct one TB-X104F_S000024_180930_ROW_DCC. Anyway it wasn't booting at all before i flashed. Now it boots, shows the logo etc and constantly says Encryption unsuccessful!, so i reset it and factory reset it but nothing changes.
I have no idea where else to go, bootloader is locked and all i can do is flash the firmware. Would there be a way to remove this from the files within the firmware?. It seems like android is there in the background but i can't get away from that encryption unsuccessful screen!
Sorry if none of this makes sense.
Yo. I got the same tablet bro. Been trying to figure out a custom recovery for her. A stock ROM would be great to have and I haven't been able to find one anywhere. Might I inquire as to where you found yours? It would be a huge relief to know I can fix it if I break it lol.
encryption
If you download the Lenovo MOTO smart assistant from Lenovo support it has a resque option. I also used that to root my tb-x104f. It downloads the original everything and if you take the boot image from the file it downloads and replace it in one that has been modified from magisk it will rescue it and you will have root also thatd what I did with mine
same problem here, reflashed with stock rom. and not resloved
frankieuk said:
I i had to reflash the firmware the correct one TB-X104F_S000024_180930_ROW_DCC. Anyway it wasn't booting at all before i flashed. Now it boots, shows the logo etc and constantly says Encryption unsuccessful!, so i reset it and factory reset it but nothing changes.
I have no idea where else to go, bootloader is locked and all i can do is flash the firmware. Would there be a way to remove this from the files within the firmware?. It seems like android is there in the background but i can't get away from that encryption unsuccessful screen!
Sorry if none of this makes sense.
Click to expand...
Click to collapse
Did you fix this issue?
I am having the same problem.
Thanks
Same problem here (my error reads "Decryption unsuccesful", but I think it's the same as yours).
After a few tries, I believe that it is a problem with the internet connection. After the factory reset, if I skip the wifi connection step, it starts normally. And it is completely usable. I can load pdf documents or apks by the usb from a computer and it runs correctly. But whenever I try to set the wifi connection, it updates something and it causes the tablet that the next time I turn it off, I find the error on the picture when turning on. It asks for a password and no matter which password you enter, then it delivers this message.
In resume, right now it is a completely functional tablet if you NEVER connect it to the internet and load anything you need via usb or bluetooth.
I tried to reset it with Lenovo Smart Assistant, but the result is the same.
I am looking for custom roms to try if it's something about the stock rom, but I haven't found any. Can anyone reccomend me a rom for Lenovo E10 X104F 2GB?
Solution: (Worked for me)
Format Data as F2FS in TWRP. (Advanced Wipe)
Then reboot and wait.

I am having problems flashing stock rom and locking bootloader

So basically, few months ago i tried to root the phone, get new recovery and different rom. If I remember correctly I got stuck trying to get custom recovery to work, because everytime I restarted phone it would be replaced by the stock one. So I left the phone as it was, and disabled the TWRP app on it. Problem was, I could not update phone. Today I tried to completely revert to stock.
I flashed stock recovery but when I tried to install update from the phone storage, it did not even give me option to select a file.
I tried to update the recovery to newer one which gave me the option to select a file, but the installation got canceled after few seconds, putting me back on the file selection screen in recovery.
I tried to instal TWRP but I can't even boot into it at all because the phone is just stuck with blackscreen and lightblue led light.
I tried to ADB sideload the newest stock rom that I downloaded from OP5 site but this one went to around 50% and then crashed as well.
I also tried to do the update using the Settings>System update > Local Upgrade but this one also fails once it gets into recovery.
I tried wiping cache/reset system settings or wiping every data on the phone before any update but none of it seems to help and everytime I restart the phone afterwards the TWRP app is still there needing an update.
I tried to just lock the bootloader but I got the "Your device is corrupt. It can't be trusted and will not boot" message followed by link to google support. I assume that is because of the TWRP app that is on the phone but I can't get rid of it no matter what I try. I tried searching for people having simillar problems but I couldn't find anything that would help me.
Any suggestions?
Thanks in advance.
You can go with the last resort and use the Unbrick tool.
https://forum.xda-developers.com/oneplus-5/how-to/guide-unbrick-guide-hard-bricked-t3761706

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