Develop Bugs

[Q] Root66 T999UVDM5 ROM

I have been on all the Root66 versions, and have had no problems ever...... till this UVDM5
I made a CWM backup (2 just to be sure) and proceeded to flash this new version that I have been waiting for so anxiously!
After it booted up, my desktop was the same, and all the apps showed, but talkback was already turned on, and I could no way get to the settings to turn that #$%%$ thing off. Heck, I could not even get to anything at all. It kept talking and reciting numbers everytime I tried to do anything. It was "Frozen" on the main homescreen, and could not do anything. I sometimes could get to the app drawer and that, too, would not scroll or do anything. I Re-flashed the thing after doing another download with the usual cache, dalvic blow out, and it acted the same way...
I decided to revert to the backup and tried to get to recovery (CWM).... That, too was gone! Stock recovery. I flashed the only version I had of CWM and it booted, and declared both of my backups were "corrupt" after it was almost done restoring?????? WTF!!!
I then reloaded UVDMD5 again, got the same results so did a factory restore and got to install my ROM manager, and re-flashed CWM to the version it uses, and tried the restore.....
It worked, and now after some pressure packed moments, I'm back to the UVLJA. I have to go on a trip tomorrow, (in a few hours) and need the phone working. PHEW! if anyone knows why the hiccup that I had occurred, please chime in and let me know. I still want the new OS and after my return, I plan to do the update again.... Hopefully....... Just gotta ccalm m my nnnneerves a bit before I attempt it again!

bobolinko said:
I have been on all the Root66 versions, and have had no problems ever...... till this UVDM5
I made a CWM backup (2 just to be sure) and proceeded to flash this new version that I have been waiting for so anxiously!
After it booted up, my desktop was the same, and all the apps showed, but talkback was already turned on, and I could no way get to the settings to turn that #$%%$ thing off. Heck, I could not even get to anything at all. It kept talking and reciting numbers everytime I tried to do anything. It was "Frozen" on the main homescreen, and could not do anything. I sometimes could get to the app drawer and that, too, would not scroll or do anything. I Re-flashed the thing after doing another download with the usual cache, dalvic blow out, and it acted the same way...
I decided to revert to the backup and tried to get to recovery (CWM).... That, too was gone! Stock recovery. I flashed the only version I had of CWM and it booted, and declared both of my backups were "corrupt" after it was almost done restoring?????? WTF!!!
I then reloaded UVDMD5 again, got the same results so did a factory restore and got to install my ROM manager, and re-flashed CWM to the version it uses, and tried the restore.....
It worked, and now after some pressure packed moments, I'm back to the UVLJA. I have to go on a trip tomorrow, (in a few hours) and need the phone working. PHEW! if anyone knows why the hiccup that I had occurred, please chime in and let me know. I still want the new OS and after my return, I plan to do the update again.... Hopefully....... Just gotta ccalm m my nnnneerves a bit before I attempt it again!
Click to expand...
Click to collapse
It seems to be an issue with the latest version of TalkBack on most roms. I had the issue already and from what I read in the forums, many other people have to. My advice, as soon as you flash a rom, uninstall or freeze talkback and DO NOT let it update to the latest version. Im not too sure what the issue is but hope Google fixes that soon.
I think also that I had a problem before when I installed the stock 4.1.2, it seemed to take my sdcard and renamed it to 0 on the sdcard. Took me a few hours to figure that out. I then copied everything that was in the folder 0 over everything in the root of the sdcard and it was back to normal.

Thanks! (Clicked it already)
I did notice a LOT of stuff was on the external card after the final recovery to the older version and had to clean up the external SD card.
You were right! I had no means to freeze the TalkBack, or do anything at all while within the OS itself, so no alternative was available to me at that time except a Factory Restore. The re-installation of my software was just going to take too long, so I did a recovery using the same version of CWM and was back where I was before the fiasco. Good thing I got it going.... Ida been really screwed! LOL. I'll try again maybe later, when I get home.
When I do try again, I'll remove the SD Card and then do the install using a spare one.
Have a great day!

[Q] Gnex restarts constantly, can't do factory reset, can't reflash

Hello, there.
Get prepared for a lot of bad bad stuff..
So, my Galaxy Nexus was running on a CM-11 Snapshot build, with AOSP kernel. Yesterday, out of the blue, the phone started to get terribly slow and not responsive at all. After a few minutes, it restarted, only to do the same. A couple of minutes maybe, booting up, then get slow and reboot - it did this constantly, and it still does.
I have tried to go into clockworkmod recovery - wiped cache, wiped dalvik cache, wipe user data (factory reset). The phone booted up again, but my apps, etc. were still there! Nothing had happened. I did it a couple of times, but nothing at all.
Then, I have found a .zip file that was still on my memory, with the latest snapshot I had installed. I tried installing it with the install from sd card option, but when it loaded up again, I was still seeing the same apps, background etc.! Nothing had happened and no error message.
Decided to leave the "custom" days behind, I downloaded the stock image for my Gnex. However, since it is a yakjuxw build, I had to flash the yakju option - so not the ideal "stock" package. Using the google installer, I was unable to proceed, since the bootloader number was different than the one that the installer expected, so it exited.
I have found online the amazing Nexus Root Toolkit from WugFresh. I tried to flash it from there, enabling the "force flash" option.
It started out ok.. But when it went to the "system" portion, it took 25 minutes (!) to complete and then in the "user data" portion, it said "write failure".
Still, rebooted and I was still seeing my apps etc. What on earth is happening?
Honestly, I would expect that it would be bricked by now, with all these rom flashes and factory resets. I even tried flashing the stable CM version for it, but still nothing had changed.
Any help would be greeeeatly appreciated.

Yeah im pretty sure your emmc is fried. So you have two options: buy a new phone or a new motherboard. You van check by locking the bootloader if its still unlocked upon reboot your emmc is fried..
Sent from my Galaxy Nexus using XDA Free mobile app

I runned "fastboot oem lock' from my command line, and I got the status "OK".
Then I pressed "restart bootloader" on my phone, but it still says "lock state - unlocked".
So I suppose, I should let it rest in piece, or change the motherboard?

I think a motherboard is more expensive than a new phone. If it is just let it die. If it isnt you can buy a new motherboard and swap it. But I dont think that is a smart move now. The moto g for example is a awesome phone for (i think) almost the price of a new mobo.
Sent from my Galaxy Nexus using XDA Free mobile app

same problem here
It makes me wonder, I'm having the exact same issue just a couple of days later. Is this the planned obsolescence thing?
withend said:
Hello, there.
Get prepared for a lot of bad bad stuff..
So, my Galaxy Nexus was running on a CM-11 Snapshot build, with AOSP kernel. Yesterday, out of the blue, the phone started to get terribly slow and not responsive at all. After a few minutes, it restarted, only to do the same. A couple of minutes maybe, booting up, then get slow and reboot - it did this constantly, and it still does.
I have tried to go into clockworkmod recovery - wiped cache, wiped dalvik cache, wipe user data (factory reset). The phone booted up again, but my apps, etc. were still there! Nothing had happened. I did it a couple of times, but nothing at all.
Then, I have found a .zip file that was still on my memory, with the latest snapshot I had installed. I tried installing it with the install from sd card option, but when it loaded up again, I was still seeing the same apps, background etc.! Nothing had happened and no error message.
Decided to leave the "custom" days behind, I downloaded the stock image for my Gnex. However, since it is a yakjuxw build, I had to flash the yakju option - so not the ideal "stock" package. Using the google installer, I was unable to proceed, since the bootloader number was different than the one that the installer expected, so it exited.
I have found online the amazing Nexus Root Toolkit from WugFresh. I tried to flash it from there, enabling the "force flash" option.
It started out ok.. But when it went to the "system" portion, it took 25 minutes (!) to complete and then in the "user data" portion, it said "write failure".
Still, rebooted and I was still seeing my apps etc. What on earth is happening?
Honestly, I would expect that it would be bricked by now, with all these rom flashes and factory resets. I even tried flashing the stable CM version for it, but still nothing had changed.
Any help would be greeeeatly appreciated.
Click to expand...
Click to collapse

Google's secret weapon to make us buy the new Nexus 6.
I don't know why that happens though - dual core processor, with this amount of RAM. Tech-specs-wise, GNex has nothing to be jealous about than mid-range smartphones right now.. Unless, the CPU architecture from 2012 is so bad that it can't run properly today's apps.

Hey guys, I have these problems too. Just bought the Galaxy Nexus from a friend for €15 (cracked screen) and from the moment I turn it on, (sometimes at Nexus logo, sometimes on lockscreen.. ) it reebot itself. Again and again.
Unlocked the bootloader by toolkit or manually by fastboot but after the reboot it's locked again, as you said. I've tried Odin too with same results. The strange thing it's that it took time to do things but after the reboot, it's like I haven't done anything. I mean, even if I delete an app, or wipe data from recovery (not custom), when it turns on, it's always the same.
It's like a challenge to me. Anyone can help? I can't just give up >.<
Inviato dal mio Nexus 4

What the hell, just finished answering another thread with same issue (forum.xda-developers.com/galaxy-nexus/help/wipe-flash-restarting-help-t2908788). Happened to me last week, very same, never touched the phone, always stock.
What the hell is going on here???

Is there any way to get any log files to determine what the hell is going on?
Mine opens up for a few minutes, maybe 3-4 and it seems to be working well.. It gradually gets unresponsive and ultimately restarts.. So, if there is anything to do during these 3-4 minutes, I would be glad to know..

If you have backed up your sdcard data to your computer, and are prepared to start from scratch (i.e. flashing bootloader and recovery via fastboot, etc.), you can do a full erasure with "fastboot -w" in fastboot mode. This has worked for me in the past to fix data corruption, of which it sounds like you may be a victim. See if that works, but make sure you've backed up your sdcard backups and other data you want to keep first!!!!!!!!

7175 said:
If you have backed up your sdcard data to your computer, and are prepared to start from scratch (i.e. flashing bootloader and recovery via fastboot, etc.), you can do a full erasure with "fastboot -w" in fastboot mode. This has worked for me in the past to fix data corruption, of which it sounds like you may be a victim. See if that works, but make sure you've backed up your sdcard backups and other data you want to keep first!!!!!!!!
Click to expand...
Click to collapse
Already tried, uneffective. Everything, no matter how low level (e.g. Odin) has no effect, like the memory is write-protected. I've read elsewhere this means the eMMC is fried, but if you go backwards in this forum you see many ppl had the very same problem in the past few days/weeks. Very strange indeed.

I'm having exactly the same issue, was running CM11 mod too. Could it be a cyanogen fail?

Atreb92 said:
I'm having exactly the same issue, was running CM11 mod too. Could it be a cyanogen fail?
Click to expand...
Click to collapse
No. I've always been on stock.

fabrice79 said:
No. I've always been on stock.
Click to expand...
Click to collapse
But could it really be a hardware fail? It's pretty strange tho that multiple device have the same hardware issue in such a short time difference

Atreb92 said:
But could it really be a hardware fail? It's pretty strange tho that multiple device have the same hardware issue in such a short time difference
Click to expand...
Click to collapse
That's what I say, but just go backwards and have a look at older post. I subscribed to ~10 posts until 15 Oct then I got tired of browsing backwards...

I'm allready looking at older posts thats why i'm saying it's pretty strange that there is a massive hardware fail for this many devices. If it's a software fail there must be a solution somehow.

Same problem by 31th December...

Yeah, i have the same problem since august 2014. This thread confirmes for me, that my Gnex is really dead. It is sad, it served my very well and i wanted to use it as secondary phone and as mobile hotspot.

Same for me at the beginning of december

This problem I've faced one time and that meant that EMMC is fried, as fellow members said earlier.
If you overwrite the storage and reboot then everything's the same means that you can't write (somehow) thus emmc is dead. Write failure also means that EMMC is dead.
It's really sad, but that's it

[Q] Omg - LOL help

I think i made a boo boo.
I have a a Fire TV since november without any issues, it was rooted with X.1.4.1 FW and using the partially unlocked RBOX bootloader (where you can choose kernal or recovery). Blocking the 3 sites so it can't update automatically. I was using the already rooted 1.4.1 from here
What happened was i had a unrelated problem with router and purchased a new one, i completely forgot about the 3 ports to block. A day or so later (normally my unit lives inside KODI and never has any problems) i noticed the white light on the box pulsating. it was sitting in CW recovery mode and i realized what i did. Since Friday when i blocked the 3 sites, every day i notice that unit is rebooted and sitting in recovery mode. I tried rebooting, everything still works, but after X hours its back in recovery. Yesterday, not being able to figure it out, i just reset/wipe, cleared Dalvik and Cache and reloaded the rom.zip file i had. No errors or anything, didnt put kodi on it, just left it at amazon home menu, but tonight when i came back home it was back in recovery mode (I Have a UPS on everything, so it's not a power related issue).
I noticed in APPS, it has Super SU but not Towel root (i dont remember if it was even there when loading the rooted Rom (so this might not be a problem at all), but not sure what is causing it to go to recovery. The FW still shows 1.4.1 (and remember, i loaded it back from the ROM.zip).
Any help would be appreciated * can't believe i forgot to block the sites in the new router until it was too late.

flipper2006 said:
I think i made a boo boo.
I have a a Fire TV since november without any issues, it was rooted with X.1.4.1 FW and using the partially unlocked RBOX bootloader (where you can choose kernal or recovery). Blocking the 3 sites so it can't update automatically. I was using the already rooted 1.4.1 from here
What happened was i had a unrelated problem with router and purchased a new one, i completely forgot about the 3 ports to block. A day or so later (normally my unit lives inside KODI and never has any problems) i noticed the white light on the box pulsating. it was sitting in CW recovery mode and i realized what i did. Since Friday when i blocked the 3 sites, every day i notice that unit is rebooted and sitting in recovery mode. I tried rebooting, everything still works, but after X hours its back in recovery. Yesterday, not being able to figure it out, i just reset/wipe, cleared Dalvik and Cache and reloaded the rom.zip file i had. No errors or anything, didnt put kodi on it, just left it at amazon home menu, but tonight when i came back home it was back in recovery mode (I Have a UPS on everything, so it's not a power related issue).
I noticed in APPS, it has Super SU but not Towel root (i dont remember if it was even there when loading the rooted Rom (so this might not be a problem at all), but not sure what is causing it to go to recovery. The FW still shows 1.4.1 (and remember, i loaded it back from the ROM.zip).
Any help would be appreciated * can't believe i forgot to block the sites in the new router until it was too late.
Click to expand...
Click to collapse
Why wouldn't you block updates via adb shell? so you can avoid ever it trying to update just a tip for future

patt2k said:
Why wouldn't you block updates via adb shell? so you can avoid ever it trying to update just a tip for future
Click to expand...
Click to collapse
I did, actually, forgot about that. But let me add some info to what is happening.. I thought it was just sitting at the recovery mode, but then it's restarting on its own, then a little while later ,back to recovery and process repeats. How do i fix this, anybody, not sure what to do next?

flipper2006 said:
I did, actually, forgot about that. But let me add some info to what is happening.. I thought it was just sitting at the recovery mode, but then it's restarting on its own, then a little while later ,back to recovery and process repeats. How do i fix this, anybody, not sure what to do next?
Click to expand...
Click to collapse
Have you tried a factory reset? I wonder if it might be a power source issue, with the power supply dropping to a point of failure but only temporarily.

xm41907 said:
Have you tried a factory reset? I wonder if it might be a power source issue, with the power supply dropping to a point of failure but only temporarily.
Click to expand...
Click to collapse
I did a factory default initially with a wipe, but i never did format of data and system so i tried that last night and will see what happens. So far it didnt reset since then, so weird that keeps resetting, i dont see how it would get from recovery back to working again without anything happening by itself.

[Q] Really need your expert help guys! SM-T800

Alright, I'll lay out what happened. My end goal is to just have a rooted tab, but at this point, I'd be willing to just have it back to how it was. Preferably without losing everything on it.
-Looked around on how to root it, and found the following, and use the files it suggested.
- Seemed easy enough, and I had rooted/installed android on my old HP Touchpad, so I dl'd the files, and gave it a shot.
- Couldn't get CWM recovery on it, so I ran verify root and it said it wasn't rooted, even though I has SuperSU. It would even ask to grant apps permission, and I'd grant it.
- I opened SuperSU, and it'd say it needed to update the binaries, but would fail on normal, so I dl'd the newest zip, booted into recovery, and tried to load it like that, but 2 lines would come up red. I think they were just verifying signatures, so I ignored it and let it reboot.
- I opened SuperSU again, and it still said it needed the binaries updated, failed on normal attempt. I decided to try again from scratch, unrooting it and all. So, I went into the SuperSU settings and did it's thing, but it still had the version of SuperSU that initially was on it (it wouldn't let me past the "update binaries" prompt).
- I found that I needed to use Odin to flash a stock firmware back on it, and dl'd both version here.
- I tried the first one, and then it wouldn't get past the "Samsung" screen (the 2nd one with just the word Samsung, if it matters).
- I can still boot into Odin and Recovery, thankfully, so I tried the 2nd stock firmware. Same issue.
- Finally, I tried the rooting process again, hoping to get it to boot, same thing. So, I tried the 2nd stock firmware again, praying something good would happen, and still stuck on the Samsung screen.
I can still boot into Odin and recovery, but I have no idea where to go from here. I still want it rooted if possible, and I'd prefer not to lose all my games and such. I just found "[ROOT][RECOVERY] [ALL IN ONE] Cf-Autoroot-twrp-T800-T805-T-700-T705" thread here, but I didn't want to try it just yet.
It's a SM-T800. I had Lollipop on it. Don't know much else to add, but please help!
Thanks all.

Cypher5235 said:
Alright, I'll lay out what happened. My end goal is to just have a rooted tab, but at this point, I'd be willing to just have it back to how it was. Preferably without losing everything on it.
-Looked around on how to root it, and found the following, and use the files it suggested.
- Seemed easy enough, and I had rooted/installed android on my old HP Touchpad, so I dl'd the files, and gave it a shot.
- Couldn't get CWM recovery on it, so I ran verify root and it said it wasn't rooted, even though I has SuperSU. It would even ask to grant apps permission, and I'd grant it.
- I opened SuperSU, and it'd say it needed to update the binaries, but would fail on normal, so I dl'd the newest zip, booted into recovery, and tried to load it like that, but 2 lines would come up red. I think they were just verifying signatures, so I ignored it and let it reboot.
- I opened SuperSU again, and it still said it needed the binaries updated, failed on normal attempt. I decided to try again from scratch, unrooting it and all. So, I went into the SuperSU settings and did it's thing, but it still had the version of SuperSU that initially was on it (it wouldn't let me past the "update binaries" prompt).
- I found that I needed to use Odin to flash a stock firmware back on it, and dl'd both version here.
- I tried the first one, and then it wouldn't get past the "Samsung" screen (the 2nd one with just the word Samsung, if it matters).
- I can still boot into Odin and Recovery, thankfully, so I tried the 2nd stock firmware. Same issue.
- Finally, I tried the rooting process again, hoping to get it to boot, same thing. So, I tried the 2nd stock firmware again, praying something good would happen, and still stuck on the Samsung screen.
I can still boot into Odin and recovery, but I have no idea where to go from here. I still want it rooted if possible, and I'd prefer not to lose all my games and such. I just found "[ROOT][RECOVERY] [ALL IN ONE] Cf-Autoroot-twrp-T800-T805-T-700-T705" thread here, but I didn't want to try it just yet.
It's a SM-T800. I had Lollipop on it. Don't know much else to add, but please help!
Thanks all.
Click to expand...
Click to collapse
Well... you said you just updated to lollipop, but in order to not stay stuck at splash screen, you have to factory reset. I saw that you don't want to lose your games and such so you probably only have one option. That option is to flash twrp and make a nandroid of your data. Simply boot into download mode, download the twrp .tar http://twrp.me/devices/samsunggalaxytabs105.html
And now go into Odin, untick autoreboot, now hit the pda/AP button and pick the twrp tar. Hit start and let it do its thing. Now after its done flashing, your gonna have to force reboot. Simply hold power+volume up and down+home button all at the same time. Wait a bit and when the screen turns black, quickly press power+volume up+ home buttons all at the same time and it should boot into twrp.
Now in twrp, hit backup and hit backup data. Hopefully that should save your apps installed. Now after its done, go into wipe and silde factory reset. It should remove installed apps from Google play store and it won't remove pictures and such. It just removes the apps you installed. Then now reboot and wait....
Hopefully this helped
-DUHA

As said you will have to factory reset, this will wipe data and cache.
You can use the link you posted above to install TWRP and root.
http://forum.xda-developers.com/galaxy-tab-s/development/root-cf-autoroot-twrp-t800-t3079488
Lollipop changes the data partition so even if you back it up and then restore it with twrp In kitkat it likely won't boot afterwards.
All you can do is wipe it and take the hit.

Alright, I have TWRP running. The size of my "data" is just over 16 gig, and my space on the sdcard is 14.9 gig, so I've been trying to delete data to knock it down. I still have 1.3 gig to go. Everything I'm deleting, in the data folder, is barely making an impact.
I see what you're saying that I probably won't be able to restore it and have it work, but I still will try. I can always factory reset it again later. Once I wipe it, though, and update back to lollipop, couldn't I restore that data backup?
I gotta take a break and knock out some real work, lol, then I'll continue, and update here. If nothing else, maybe it'll help some other poor soul like me in the future!
Once I have it booting all the way again, do I just use TWRP to install SuperSU and it's rooted? Thanks again. I appreciate it!

Not sure what youre trying to do here. Just wipe the data partition with twrp,
Sent from my SM-T805 using XDA Free mobile app

Ashyx, I was just trying to save my game data, while ending up with a rooted tab. And you were right, of course! I tried to restore the back up to no avail, haha....well, I wiped it again, and it booted up just fine, and it is rooted to boot. I can't believe it was that easy with TWRP to root it.
I'm betting this isn't going to work out, but is there anyway to extract my game data from that backup I made, and transfer just that back to my tablet? If it is possible, it'll probably be beyond my ability, I bet, but I'm just curious.
One other question. With TWRP, can I get Lollipop back on it? Or do I need something else on it first?
Now, it's off to figure out how to get my Impulse Controller to work with it so I can play my games with it!
Thanks for helping me out, regardless. I truly thought I had bricked my $600 tablet. My wife would've killed me for wasting that much money, lol!

There is an app called nandroid manager that will allow you to extract data from nandroids, you could extract your game data with that.
The better way would be to make a system and data backup of your current system, reflash lollipop then restore your lollipop data backup. Then back up your game data with titanium backup.
Restore your kitkat backup then restore your game data with tb.

Help - Galaxy Tab S 10.5 Bootloop Out of Nowhere

So...
Last week, my wife's Tab S went into a bootloop. She runs complete stock, we haven't rooted, or anything. There had been a notification about an update, but she hadn't touched it. She'd updated to Lollipop at some point last year, but hadn't applied the absolute latest update. One day last week, she just turned it on, and it started bootlooping.
Because it was so stock, there were no backups, no nandroids, or anything like that. No Custom Recovery. I told her "well, we can just do a factory reset. You'll lose everything, but once we get you back up and running, it'll just re-download everything from the Goog." So we factory reset it. Looked good for a minute, booted into the first screen, enter in your Wi-Fi password, all that. As soon as we got the Wi-Fi password entered, however, it re-booted. And keep rebooting. Bootloop city. No problem. I walked her through (over the phone) using Odin to flash the latest Lollipop firmware. No dice. It appeared to flash successfully, but still bootlooped.
Over the weekend, I tried using Kies to flash the most official firmware I could find. Everything was successful -computer recognized the device, was able to download "direct from the source," as it were, but it got stuck at 69% twice before failing. I read somewhere that one had to run Kies in administrator mode to get it to successfully complete. So I did, and it got past 69%, successfully completing the flash. STILL NO LUCK. STILL WITH THE BOOTLOOPS.
Last night, I realized that I hadn't flashed in Odin using Administrator Mode. Tried it, using latest 5.0.2 (XAR-Cellular South). Flashed successfully, all appeared well. Still bootlooped.
So, I'm stuck. I can get into recovery, I can get into Download Mode, I can successfully flash. I just can't get the darn thing booted.
Thoughts, anyone? Should I try flashing a Custom ROM? How hard is that using Odin? Thanks in advance.

Ok this will take a few tries but here is my method of dealing with this situation
1) Flash stock using Odin
2) AS SOON AS the screen goes blank, start holding Power+Volume Up+Home
3) When recovery boots, release the buttons
4) Use the volume buttons to select "Wipe data/factory reset"
5) Press power to confirm
6) Reboot
If that doesn't work, you may either:
1) (more likely) Installing a ROM will fix the problem
2) (unlikely but possible) You might have worn NAND pages, which I doubt but could cause this behavior.

Nandr0idC0nsumer said:
Ok this will take a few tries but here is my method of dealing with this situation
1) Flash stock using Odin
2) AS SOON AS the screen goes blank, start holding Power+Volume Up+Home
3) When recovery boots, release the buttons
4) Use the volume buttons to select "Wipe data/factory reset"
5) Press power to confirm
6) Reboot
If that doesn't work, you may either:
1) (more likely) Installing a ROM will fix the problem
2) (unlikely but possible) You might have worn NAND pages, which I doubt but could cause this behavior.
Click to expand...
Click to collapse
Thanks, I'll try these steps tonight when I get home, and report back!

All right, here's something interesting. Before I tried your first step, I remembered that the other night, I left it stuck at the Samsung logo -it was just kind of stuck there, and since the behavior was a little different than I'd seen before (not continuous bootlooping), I thought I'd boot into recovery and wipe. I did, I wiped (factory reset), and rebooted. The tablet booted into the first screen, Accessibility/Wi-Fi, blahblah. This was where it usually rebooted. On a hunch, I bypassed entering in my WiFi key. I then bypassed almost everything else (Samsung account, Google account, etc.), expecting that the tablet would reboot at any moment. But I made it to the front apps page, where it shows you the side-launcher, the Magazine-Flipboard thingie, and whatnot. Wi-Fi still not connected, though. I opened up the app drawer, and scrolled around. Looked really good for a moment. I even took a picture with the camera, and viewed it in Gallery! Feeling brave, I thought, "well, maybe it just needed a couple of minutes before firing up the radio." So I went into settings, and inputted my WiFi key. It connected. And rebooted into its bootloop. (getting so tired of that boot-sound).
Went ahead and flashed the most original stock firmware I could find. As always, flashed successfully. As soon as it booted, I made my way to recovery, and wiped, per your instructions. No luck. Bootloop again.
It's something in the WiFi is what I've come to think as a result of the above. Which I don't entirely understand, as I thought the radio got re-flashed with the firmware.
I'm ready to try flashing a Custom Rom. Can I do that through Odin, or should I try and flash TWRP, and do it through there? Will TWRP flash without a working (bootable) OS?
All right. Thanks for your response!

Try this as a test.
First make a full backup of every partition with twrp including the EFS <<IMPORTANT!
Get it booting again without wifi then root the device and delete the EFS folder or delete it in recovery.
Reboot the device and try and enable wifi.

ashyx said:
Try this as a test.
First make a full backup of every partition with twrp including the EFS <<IMPORTANT!
Get it booting again without wifi then root the device and delete the EFS folder or delete it in recovery.
Reboot the device and try and enable wifi.
Click to expand...
Click to collapse
Got TWRP installed. Won't backup. Fails at 16% (system partition, I think). Just powers down to battery indicator in the middle of the backup. Looks like it backs up the EFS, though, since it's the first one. And when I go into TWRP's Restore option, there's a backup there (though I don't dare try and restore it).
Now I have to figure out a way to get the Custom ROM and GAPPS I downloaded onto the tablet without a reliable boot... It's gotten to the front screen a time or two tonight, but starts looping even when I bypass the WiFi setup.

Entered adb/TWRP interface. Tried to push two files, a Custom ROM file, and a GAPPS file. The ROM failed, with some sort of "Error 7," incompatible data, blahblah... Just out of curiosity, I tried to push the GAPPS file, and that failed after about 6%, and the tablet powered off.
I'm running out of ideas.

copied a custom rom to a USB/OTG stick (thumbdrive), and plugged it in. Fired up TWRP, tried to install. Wouldn't. Wouldn't install GAPPS, either. Looks like the only way it wants to flash anything is through ODIN or KIES.

The Latest...
All right...
I remembered that sometimes the TWRP version mattered. When I installed TRWP last night, I installed the latest and greatest, 3.0.2. Last night after I gave up, I remembered that sometimes, the latest and greatest TWRP doesn't install things perfectly. So, this morning, I downloaded TWRP 2.8.6-ish onto the USB/OTG device, and re-flashed the recovery partition. To be honest, I was surprised that TWRP was even able to flash that (but the TWRP image is only like 9.8 MB, so...)...
Got TWRP 2.8.6.0 flashed, and rebooted into TWRP. Immediately decided to try and re-flash the custom ROM that I'd tried unsuccessfully to flash last night, since the thumbdrive was still plugged in. Resurrection Remix Lollipop. Lined up GAPPS in the queue, as well. The ROM *appeared* to flash better than it had in TWRP 3.0.2, but it was sort of hard to see... GAPPS failed, and I was prepared to watch another round of bootloops. It did bootloop, sort of. The RR splash screen appeared, said that it was installing (or preparing) xx out of XX apps. Then, it rebooted. I figured it was doing its bootloop thing. However, it got to the same screen, "installing xx out of XX apps. Except that XX number had gone down, and the xx number had gone up. It repeated this action about 4 times --the last time I saw it reboot, it was "installing 1 out of 2 apps." And then...?
It booted into the RR lockscreen.
Of course, there were no GAPPS. In fact, there are something like only 20 apps total on the tablet. But it appears somewhat stable at the moment. (See picture).
Afraid to try and connect WiFi, afraid that it'll just bootloop.
Speaking of bootloop. At one point, once we got it booted, my wife hit an option in the Settings. LCD Density, I believe. As soon as she hit it (she literally just placed her finger over the 320 default option), the tablet rebooted. No loop, though. Rebooted straight back to the RR lockscreen.
So I appear to have a somewhat stable OS flashed onto the tablet at the moment. No GAPPS, though. No WiFi.
Anybody have a suggestion on where to go from here? I have my doubts as to whether or not I can even back up this configuration.
Sorry about all the updates. I kind of figured that if *anyone* else ever goes through what I'm going through, they'll have some sense of all the different things that can be tried in resurrecting a bricked/bootlooping device. I appreciate everyone's efforts to date -thank you so much, @Lightn1ng and @ashyx.

All right, because I can't leave well enough alone....
I got WiFi up and working. Tablet still stable and working. Wheeeee.... No GAPPS, though.
Downloaded GAPPS, second-smallest package from opengapps- only 128M (5.1 ARM package). Downloaded it in Android, from the tablet! Tried to flash it in TWRP. Failed, tablet rebooted halfway (not even) through. Now it's bootlooping again...
I should've left well enough alone, and waited for someone. Have tried re-installing Resurrection Remix, but tablet keeps failing to flash. Might have to try and flash a different TWRP. I don't know...

Have you tried another Gapps? Also, is this the WiFi only model or the LTE model we're talking about?

Lightn1ng said:
Have you tried another Gapps? Also, is this the WiFi only model or the LTE model we're talking about?
Click to expand...
Click to collapse
It's the WiFi-only model - SM-T800.
It's kind of weird. I thought it might be some sort of internal memory problem (like the worn Nand pages you mentioned), since almost anything I try to do in TWRP fails (although I was able to flash an entire Custom ROM the one time AND get it booted) -but backing up isn't working, whether it's to internal/external SD. And the fact that I can flash perfectly (subjective term there) well using Odin or Kies tells me that whatever problems the tablet is having, something's getting through.
I'll try a different GAPPS package. Right now, though, TWRP isn't letting me flash hardly anything, and moving files back and forth on this thing is just awful.
AGH - I was so close!

daina said:
It's the WiFi-only model - SM-T800.
It's kind of weird. I thought it might be some sort of internal memory problem (like the worn Nand pages you mentioned), since almost anything I try to do in TWRP fails (although I was able to flash an entire Custom ROM the one time AND get it booted) -but backing up isn't working, whether it's to internal/external SD. And the fact that I can flash perfectly (subjective term there) well using Odin or Kies tells me that whatever problems the tablet is having, something's getting through.
I'll try a different GAPPS package. Right now, though, TWRP isn't letting me flash hardly anything, and moving files back and forth on this thing is just awful.
AGH - I was so close!
Click to expand...
Click to collapse
I'm running out of ideas!
Maybe somebody else with a T800 could backup their entire EMMC using
Code:
dd if=/dev/mmcblk0 of=/sdcard/full_nand_dump.bin
And you take the file on your tablet and do
Code:
dd if=/sdcard/full_nand_dump.bin of=/dev/mmcblk0
And restore YOUR efs folder using TWRP.
THIS IS A DANGEROUS OPERATION AND I AM NOT RESPONSIBLE FOR ANYTHING THAT GOES WRONG!
---------- Post added at 08:01 PM ---------- Previous post was at 07:57 PM ----------
@ashyx Any more ideas before I go ahead with my evil world domination plan to recover this device?

I wouldnt carry out any risky operations until a full backup can be made with twrp or you may end up with an unrecoverable device.
If twrp cannot backup the system partition then there is an issue with the partition.
Try backup again and post the recovery log, it may contain some relative information.

I have the same issues and have tried eveything. I was rooted and running the latest Pheonix rom on my sm-t800. Last Wednesday (8-10) I starting getting boot loops out of nowhere, no new apps nothing just a daily driver. I've been through everything on here and have gone back to bone stock but to no avail, the boot loops just keep coming. I can connect to wifi and get things set up but if I try to use anything more than 'light usage' the tab starts its boot loops again and rows fits for about 10 minutes and always different timing on the boot. Sometimes it will make it to the Samsung logo, sometime only to Tab S and sometimes about 10 seconds of usage.. I know this isn't helping much but wanted to let you know there are more of us with the same problem. Will be blab to try anything to help said issue.

Exactly the same issue on my LTE version.
Samsung support just asked me 230€ for a new motherboard.
I refused to repair. I think it is related to nand memory..

Hello I have both the 8.4" and 10.5" I updated the 8.4" to Android 5.02 nothing but boot loops my other is still on 442 and I wont be updating it as its working fine. I have been reading a few posts and the problem was right in front of me all the time I have 2 internet connections 2.4 GHZ and 5.0 GHZ if I connect to the 5.0 GHZ I get boot loops but if I stay on 2.4 GHZ no problems what so ever so I may just install a custom rom and my 10.5 tab and stay clear of the faster internet.

srfairhurst said:
Hello I have both the 8.4" and 10.5" I updated the 8.4" to Android 5.02 nothing but boot loops my other is still on 442 and I wont be updating it as its working fine. I have been reading a few posts and the problem was right in front of me all the time I have 2 internet connections 2.4 GHZ and 5.0 GHZ if I connect to the 5.0 GHZ I get boot loops but if I stay on 2.4 GHZ no problems what so ever so I may just install a custom rom and my 10.5 tab and stay clear of the faster internet.
Click to expand...
Click to collapse
Why not just update to Marshmallow? Absolutely no issues for me.

ashyx said:
Why not just update to Marshmallow? Absolutely no issues for me.
Click to expand...
Click to collapse
Now i figured out its the wifi thats causing the problem i will update to android 6.01 or if i can find a good custom rom il risk that.

daina said:
It's the WiFi-only model - SM-T800.
It's kind of weird. I thought it might be some sort of internal memory problem (like the worn Nand pages you mentioned), since almost anything I try to do in TWRP fails (although I was able to flash an entire Custom ROM the one time AND get it booted) -but backing up isn't working, whether it's to internal/external SD. And the fact that I can flash perfectly (subjective term there) well using Odin or Kies tells me that whatever problems the tablet is having, something's getting through.
I'll try a different GAPPS package. Right now, though, TWRP isn't letting me flash hardly anything, and moving files back and forth on this thing is just awful.
AGH - I was so close!
Click to expand...
Click to collapse
DrinkSlinger said:
I have the same issues and have tried eveything. I was rooted and running the latest Pheonix rom on my sm-t800. Last Wednesday (8-10) I starting getting boot loops out of nowhere, no new apps nothing just a daily driver. I've been through everything on here and have gone back to bone stock but to no avail, the boot loops just keep coming. I can connect to wifi and get things set up but if I try to use anything more than 'light usage' the tab starts its boot loops again and rows fits for about 10 minutes and always different timing on the boot. Sometimes it will make it to the Samsung logo, sometime only to Tab S and sometimes about 10 seconds of usage.. I know this isn't helping much but wanted to let you know there are more of us with the same problem. Will be blab to try anything to help said issue.
Click to expand...
Click to collapse
Hello,
and the rest of story??
i can flash TWRP in download mode, and i can intall zip by TWRP , the lineage rom,
but, cant odin flash official md5 file, it stucks on logo.