SM-T835 restart endless boot loop - Samsung Galaxy Tab S4 Questions & Answers

Last night i restarted my tablet, but continually drops into recovery mode.
I have also been in a menu which recommends 'erase app data' to boot into safe mode, in order to backup data, prior to factory reset. So i have erased app data, but now just enters recovery menu.
I'm not sure i have any debug/developer settings switched on this device, as only flashed roms on phones long time in the past, not this tablet.
So can anyone guide me to get it into safe mode to take copy of user data partitions?
Have dabbled with some adb but doesnt recognise any devices, so wondering if being blocked by some security.
Thanks in advance
John

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[Q] gnex boot loop!

hey everyone! new to the forum. needed help bad.
i have been running CM 10.2.0 for awhile now, pretty much since it was released without any issues. yesterday for whatever reason while surfing the net my phone restarted. now it keeps restarting every 15-20 secs. my main concern at this point is saving my photos before i reset my phone and start from scratch. any ideas as to how to back up photos?
some notes on my rebooting condition.:
phone keeps rebooting even when booted up in safe mode.
-in safe mode i do have more time before it reboots itself
phone does not reboot itself when in bootloader mode or recovery mode
i tried to back up to sdcard while in recovery mode but it fails when it tries to back up data. i also tried using nexus root toolkit but to no avail.
any help would be much appreciated. feels weird to not have a phone.lol. thanks in advance
lilzed_747 said:
hey everyone! new to the forum. needed help bad.
i have been running CM 10.2.0 for awhile now, pretty much since it was released without any issues. yesterday for whatever reason while surfing the net my phone restarted. now it keeps restarting every 15-20 secs. my main concern at this point is saving my photos before i reset my phone and start from scratch. any ideas as to how to back up photos?
some notes on my rebooting condition.:
phone keeps rebooting even when booted up in safe mode.
-in safe mode i do have more time before it reboots itself
phone does not reboot itself when in bootloader mode or recovery mode
i tried to back up to sdcard while in recovery mode but it fails when it tries to back up data. i also tried using nexus root toolkit but to no avail.
any help would be much appreciated. feels weird to not have a phone.lol. thanks in advance
Click to expand...
Click to collapse
Hate when a rom just goes bad for some reason.. Could you supply the error messages you get when your backup fails? I'm guessing it might have to do with file names having weird symbols. Also you might want to backup different folders of your sdcard at a time to avoid failure; i.e., "adb pull /sdcard/Download <some_directory_on_computer>".
7175 said:
Hate when a rom just goes bad for some reason.. Could you supply the error messages you get when your backup fails? I'm guessing it might have to do with file names having weird symbols. Also you might want to backup different folders of your sdcard at a time to avoid failure; i.e., "adb pull /sdcard/Download <some_directory_on_computer>".
Click to expand...
Click to collapse
thanks for the reply. system backup finishes then it goes to back up data. after while it says that there's an error making backup image of /data
is it possible to just to use command prompt to just pull my pictures? would it just be adb pull /sdcard/dcim <some directory>?
also for some reason i am unable to communicate with my phone using adb prompts. yesterday i typed in adb devices and my phones serial number would come up as connected. today under "list of devices" its just blank....not sure what to do.
UPDATE: i was able to get my pictures off of my phone. i launched CMD through the nexus toolkit and it seemed to detect my phone.
i flashed my phone back to stock using the toolkit. for some reason after everything was said and done my phone wasnt actually set back to stock. my phone still has all my apps etc. it still restarts every few seconds.
i tried a couple force flashes using the toolkit again but still same phone. nothing has changed or been fixed. not really sure what my next plan of attack should be. any guidance is very much appreciated.
lilzed_747 said:
UPDATE: i was able to get my pictures off of my phone. i launched CMD through the nexus toolkit and it seemed to detect my phone.
i flashed my phone back to stock using the toolkit. for some reason after everything was said and done my phone wasnt actually set back to stock. my phone still has all my apps etc. it still restarts every few seconds.
i tried a couple force flashes using the toolkit again but still same phone. nothing has changed or been fixed. not really sure what my next plan of attack should be. any guidance is very much appreciated.
Click to expand...
Click to collapse
Glad to hear you got your pictures off. As far as wiping your phone. If you got everything off your sdcard that you want, you can do a fastboot wipe.
-press volume up + volume down + power to get to fastboot mode
-connect the phone to your computer and enter in the command window "fastboot devices" to see if it's connected
-enter "fastboot -w" to do a full erasure of the phone's /data partition
Then use nexus toolkit, recovery, or fastboot to flash a new rom from there. This has saved me in the past in a similar situation. Definitely make sure you have everything off your sdcard you want to keep before trying this though.
7175 said:
Glad to hear you got your pictures off. As far as wiping your phone. If you got everything off your sdcard that you want, you can do a fastboot wipe.
-press volume up + volume down + power to get to fastboot mode
-connect the phone to your computer and enter in the command window "fastboot devices" to see if it's connected
-enter "fastboot -w" to do a full erasure of the phone's /data partition
Then use nexus toolkit, recovery, or fastboot to flash a new rom from there. This has saved me in the past in a similar situation. Definitely make sure you have everything off your sdcard you want to keep before trying this though.
Click to expand...
Click to collapse
thanks so much for the help so far. unfortunately everything you have told me so far has not worked.lol. i followed the steps like u said but the phone just stays on the "google" screen after i install a stock rom. left for 2.5 hours in hopes of it doing its thing.lol. had to pull battery and start it up. nothing changed, phone still restarts i also tried using toolkit to flash stock + unroot (both in bricked mode and normal mode), flashed zip stock images and installing in recovery mode. i also used CMD to push stock images to my phone and installing but still nothing.
i also followed the instructions extactly on this forum http://forum.xda-developers.com/showpost.php?p=34552123&postcount=1
all of the steps successfully completed but after a reboot my phone was left unchanged.
i may have screwed up my description of the problem earlier. the phone restarts after my phone stop responding/freezes. i also find that there almost always is a program that stops working. i find handcent sms is having the most errors. tried to uninstall but phone freezes. tried in fastboot/adb but nothing happens.
thanks again for the help so far.

[UNBRICKED] Data Recovery For Soft-Bricked OnePlus 5T

I'm really anxious and nervous about this so I'll simplify this as much as I can; recently my phone was turned on on top of my desk and randomly restarted. I thought little of it, as it quickly went through the OnePlus logo (it began to take longer the second time I restarted it) and Android splash screen, but then stopped on the circles animation and remained looping there. I have very important data on it that I'd like to recover and WILL NOT factory reset (flash) my phone.
The battery icon and percentage still show up when I plug in the device. I still have access to Recovery Mode, Fastboot, and Sideload through their key shortcuts. I previously had USB Debugging enabled but can't authorize ADB since I can't check the confirmation dialogue box (shows up as "unauthorized" in command prompt). I had very little storage (less than 250mB) for the last few days. I don't have root access, custom recovery, or an unlocked bootloader.
I already tried clearing my cache; if I restart after doing so it only takes a few seconds to pass the OnePlus logo as opposed to the ~20 seconds it previously took. This delay raises every few restarts. I've tried waiting many hours to see if anything would happen or if ADB would start functioning. I also tried fully draining my battery overnight and nothing happened. My files are not deleted/fully corrupt since I could still see them when flashing through internal storage from Recovery Mode. OnePlus chat support said I have to flash my phone and Twitter support refused to respond. Local data recovery centers said I could get my phone shipped to them for a free diagnostic, should I do so or is there a way to unbrick or recover my data at home?
Is there anything I can do? Thank you very much!... for now I'll just remain depressed...
TL;DR - My phone's stuck at the circles boot animation and I want to recover my files or fix the soft-brick without resetting. I don't have root access, custom recovery, or an unlocked bootloader.
UPDATE: I boot into Recovery Mode and "Reset System Settings"- my phone rebooted with 112 gigabytes of storage already taken up and all of my Android/data folders empty! I lost very little as I set my save folders to other locations! It looks like the error was not having enough storage! OnePlus chat support said that I had to factory reset my phone, DO NOT listen to them! MY PHONE IS UNBRICKED!
Check out other responses:
https://www.reddit.com/r/Oneplus5T/comments/ahfabg/data_recovery_for_softbricked_oneplus_5t/
https://forums.oneplus.com/threads/data-recovery-for-soft-bricked-oneplus-5t.986096

Booting into recovery

Hi people,
I hope this is the right place for this.
My partners phone has a bit of a problem at the moment. Not long ago her phone's power button stopped responding to a single press, however it would respond to three taps, starting emergency mode (though it's not enabled).
I suggested she presses the power button to force shut it off and it's now booting into Android Recovery menu.
Is there any way to be able to get the ROM to boot back from this WITHOUT having to re-flash the stock ROM?
We have very important data on there which hasn't been backed up yet as we didn't get a chance.
I really hope someone is able to help!
Hi, Do you see reboot system now, reboot to bootloader, enter fastboot... like options in the recovery menu? you can try to select reboot system now and power off options with your faulty power button you can press few times if you select the these two options. Only If you select the wipe data factory reset option, your data will be gone. Dont select the wipe data factory reset option.
how to root and install custom rom to this phone do any one know instructions ?

SM-N975U - Stuck in Safe mode - No Factory Reset Option Available

Long story short, I have this Note 10+, No root, no custom OS.
I decided to use Package Disabler Pro to disable all the bloat, as well as the Factory Reset options and a few other things.
I did this because the phone was being used as a WIFI only tablet for my kids; I didn't need them accessing any options that might put them or the device into any harm.
Unbeknownst to me, this would send the phone into safe mode. Once in safe mode, the device stays powered on for maybe 12 seconds. The "You are in safe mode" banner appears across the top of the screen, and then reboots, back into safe mode...
USB debugging is turned on. But keeping adb connected to the device has been a challenge as it reboots so fast.
From recovery I cannot factory reset as the option to do so has been removed. I tried fixing all applications and i did nothing.
I was however able to remove the app through ADB, but it did not help. The device is still safe mode looping.
Something is preventing the device from starting normally.
Can I flash the stock OS to get the factory reset option back?
Through adb, when I try to force factory reset, it says cannot be found.

Recover files from a Pixel 3 XL that cannot boot anymore

Hello everyone,
I come here because I have a big issue with my Pixel 3 XL.
It's up-to-date regarding the OTA updates i.e. I have the latest firmware installed.
I've never done anything special regarding "tweaking", such as enabling the developer mode i.e. the developer mode is unfortunately not enabled.
I was browsing the Internet and the phone suddenly rebooted unexpectedly. Then it was in a reboot loop. I pressed power and volume down buttons to enter the boot menu.
The boot loop stopped but I was unable to do anything to make my phone boot properly again. In the recovery menu, there is no option to wipe the cache partition.
There should be roughly 400 MB of free space on the phone. I was thinking that maybe this could have been the cause of the issue.
When the phone is off and not plugged to the charger, the percentage of battery decreases. When the charger is plugged, the percentage of battery does not decrease but does not increase either. It seems I cannot charge the phone anymore. Currently remains 13%.
When the phone is off and I press the power button, the Google logo shows up and the progress bar below has just time to appear before the phone vibrates and goes off.
I don't care much saving the phone, but it's extremely important to me to be able to recover the photos it contains (standard DCIM folder).
Most of what I found googleing so far is about wiping the cache partition, but there is no such option on my Pixel 3 XL.
Since the developer mode (USB debugging) was not enabled when the phone was working fine, I cannot use adb to pull files. I can sideload though. As far as I understood, in my situation it is not possible to enable the developer mode.
I've just heard about TeamWin Recovery Project, and still trying to figure out if this can help me.
Could someone please tell me how I can, at least, backup my photos?
Of course the best would be able to boot the phone normally, but really my first goal is to save my photos.
Is there a way to reflash the firmware with the same version, or another version, without losing data, just like what happens on a regular update e.g. when a new Android version is deployed?
Thank you.
magrac said:
Hello everyone,
I come here because I have a big issue with my Pixel 3 XL.
It's up-to-date regarding the OTA updates i.e. I have the latest firmware installed.
I've never done anything special regarding "tweaking", such as enabling the developer mode i.e. the developer mode is unfortunately not enabled.
I was browsing the Internet and the phone suddenly rebooted unexpectedly. Then it was in a reboot loop. I pressed power and volume down buttons to enter the boot menu.
The boot loop stopped but I was unable to do anything to make my phone boot properly again. In the recovery menu, there is no option to wipe the cache partition.
There should be roughly 400 MB of free space on the phone. I was thinking that maybe this could have been the cause of the issue.
When the phone is off and not plugged to the charger, the percentage of battery decreases. When the charger is plugged, the percentage of battery does not decrease but does not increase either. It seems I cannot charge the phone anymore. Currently remains 13%.
When the phone is off and I press the power button, the Google logo shows up and the progress bar below has just time to appear before the phone vibrates and goes off.
I don't care much saving the phone, but it's extremely important to me to be able to recover the photos it contains (standard DCIM folder).
Most of what I found googleing so far is about wiping the cache partition, but there is no such option on my Pixel 3 XL.
Since the developer mode (USB debugging) was not enabled when the phone was working fine, I cannot use adb to pull files. I can sideload though. As far as I understood, in my situation it is not possible to enable the developer mode.
I've just heard about TeamWin Recovery Project, and still trying to figure out if this can help me.
Could someone please tell me how I can, at least, backup my photos?
Of course the best would be able to boot the phone normally, but really my first goal is to save my photos.
Is there a way to reflash the firmware with the same version, or another version, without losing data, just like what happens on a regular update e.g. when a new Android version is deployed?
Thank you.
Click to expand...
Click to collapse
I don't think there is anything you can do without developer mode, but aren't your photos backed up to Google servers at https://photos.google.com?
dcarvil said:
I don't think there is anything you can do without developer mode, but aren't your photos backed up to Google servers at https://photos.google.com?
Click to expand...
Click to collapse
no, I don't synch with the Google cloud.
I've just read that in order to install TWRP, I needed a unlocked bootloader, which is not my case. Unlocking the bootloader would cause my data to be wiped (for security reason it seems). Is that true?
magrac said:
I've just read that in order to install TWRP, I needed a unlocked bootloader, which is not my case. Unlocking the bootloader would cause my data to be wiped (for security reason it seems). Is that true?
Click to expand...
Click to collapse
Unfortunately, that is correct. Unlocking the bootloader wipes the data. I know of nothing you can do.
was your problem resolved?

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