Develop Bugs

[Q] reboot random

Hello,
I had random reboot before with my leedroid 2.3b, and I had one also 30 minutes ago with AuraxTSense, so I'm asking if the cause is the rom or not.
When he reboot, he's not hot, I see it reboot sometimes and the phone was at normal temperature (approximately with my hands lol). it reboots max 1 time per day.
So I'm tellng myself that's it could be due to:
- radio
- S-OFF
- one app
For radio, I try tu update from 32.48.00.32U_5.11.05.14 to 32.47.00.32U_5.10.05.23, and I'll see.
For apps, the problem is that I would have not to restore all my apps, to see if one app cause it.
What do you think of it?
Thanks

My question to you is: what are you doing with your phone at the time it reboots?
Playing a game, navigating or browsing the web etc?
I just got my Desire back from htc with a new motherboard, it used to reboot randomly also. Now it doesn't anymore

Are you using SetCPU?
Could be an issue with the kernel, or how one of the SetCPU profiles handle the kernel during screen off (interactive I think?)
Or as fnotsje said, could be hardware related

fnotsje said:
My question to you is: what are you doing with your phone at the time it reboots?
Playing a game, navigating or browsing the web etc?
I just got my Desire back from htc with a new motherboard, it used to reboot randomly also. Now it doesn't anymore
Click to expand...
Click to collapse
Sometimes I do nothing...maybe it's due to an app services?
But with your old motherboard, it reboots several times per day, or like me?
eden2812 said:
Are you using SetCPU?
Could be an issue with the kernel, or how one of the SetCPU profiles handle the kernel during screen off (interactive I think?)
It's installed but not configured in smatass mode, you advise me to uninstall it and to test?
Or as fnotsje said, could be hardware related
Click to expand...
Click to collapse
What is surprising, that if it's that, i t should reboot many more times than one time per day no?
Thanks

thierry_b said:
Sometimes I do nothing...maybe it's due to an app services?
But with your old motherboard, it reboots several times per day, or like me?
Click to expand...
Click to collapse
It depended on the usage, if I used it alot, it'd reboot more than if I used it less frequent.
But I'm not sure it is the motherboard issue, because you're mentioning the phone is not hot when it reboots..

fnotsje said:
It depended on the usage, if I used it alot, it'd reboot more than if I used it less frequent.
But I'm not sure it is the motherboard issue, because you're mentioning the phone is not hot when it reboots..
Click to expand...
Click to collapse
Yes and always only one time per day, just one time maybe 2.
I desinstalled SetCPU, it changes nothing.
What do you advise me to do?
Wipe and install minimum apps, and see if I've that, and little by lttile, reinstall one new app...test few days again...?, it will be long :-(
Thanks.

Your phone shouldn't be rebooting randomly really. It's happened to me when I overclocked my CPU and played a game. It didn't like it at all. It sounds like something has buggered up somewhere down the line. If I was you, I would try quite a few more roms other than what you've tried. If it's still rebooting then it would need to get looked at by HTC or by going through you carrier (if they do it). That's what I would do.

GoogleJelly said:
Your phone shouldn't be rebooting randomly really. It's happened to me when I overclocked my CPU and played a game. It didn't like it at all. It sounds like something has buggered up somewhere down the line. If I was you, I would try quite a few more roms other than what you've tried. If it's still rebooting then it would need to get looked at by HTC or by going through you carrier (if they do it). That's what I would do.
Click to expand...
Click to collapse
With the minimum of apps, for example to see if it reboot or not?
Because if t's an hardware problem due to the radio, it censed to reboot even with few apps no?
For carrier as I'm at Orange like you, I think, they could change fastly my phone maybe. I will try that if anything works. You think that if I do that, I've to find an orange rom? I'm asking myself if they accept an HTC even restored with RUU.
Thanks

I have the same issue and ITS DRIVING ME MAD!!!!!!!!!!!!
I never experienced this with my stock ROM... so I firstly tried a gingerbread ROM... when it started... i then moved to a Sense Rom and still reboots occured... I'm now on my 2nd cooked sense ROM and still having reboots!!
WTF? is there a quick sollution?
thank you!

SO MANY follks seem to be having problems with [email protected]! Is there seriously no sollution to this or a common cause..?

had the same problem & is with HTC getting fixed
there are a few posts about it if you search - the only fix seems to be to send it to HTC for a new motherboard as some presume that it's overheating.

11 march still waiting on return of my Desire

I can relate to your issues. Mine kept rebooting when I tried to use the GPS. Like you I had mine rooted, S-off and was using a custom ROM.
After many tests, I downloaded a stock RUU, installed a different navigation app and once again, it rebooted.
Bottom Line: take it back. Its probably defective. Just make sure you're running a stock ROM. Download an RUU.

[Q] Defy grinds to a halt

Really hoping someone can help me. I have had my Defy for a few months and have always been on a custom SBF but continue to experience problems with the Defy working amazingly for hours and then sometimes I turn the screen on and the Defy is working in some kind of super slow mode and opening anything takes ages, everything does eventually open so it’s not crashed but just going super slow!
I am currently on SBF 3.4.2-177 Nordic but have had the same problem on different SBF’s so either my phone has a hardware issue or its some software I have on my phone, I am currently on Beta 6 of CM7 and have had this issue on other betas of CM7 but have never heard of anyone else with this issue. The phone will sometimes go a whole day without the issue also which is weird. It is not overclocked either. When it goes into what I now call superslow mode I have checked to see what the processor and memory usage are and both are around 60% used not being topped out at all. I have even used StabiltyTest to test the memory and CPU when the problem is occurring and both run through fine.
I really would love to know if anyone else had a similar problem or if they know what is causing it or how I can find out what is causing it without removing every bit of software I use. The only piece of software I use regularly that runs in the background is Juicedefender so I am going to remove this now and see what happens over a few days.
Any help would be amazing
Many Thanks
Bob

Did you install the latest patch for the auto-brightness issue? or Did you turn off the auto-brightness?

Thanks for the fast reply I have already installed the latest patch for auto-brightness issue but still have the problem

Was the phone slow in the stock ROM? I mean that's really wired that the problem appears on each SBF

Hi mys_721x, I only had the stock ROM for a matter of days when I first had the phone so really cant remember but I am thinking I may have to go back to see if I do still have problems if no one else can suggest anything else. Cheers

I have this same problem. Only fix seems to be a reboot whenever it happens

bobdigby said:
Hi mys_721x, I only had the stock ROM for a matter of days when I first had the phone so really cant remember but I am thinking I may have to go back to see if I do still have problems if no one else can suggest anything else. Cheers
Click to expand...
Click to collapse
Same here, my phone suddenly becomes sluggish and unusable. Yesterday it was stuck on 100% cpu usage, I entered the task manager to see what was wrong and there wasn't any application that was using the cpu.
Only solution is to reboot everyday.

Glad to see I am not the only one, yea a reboot does the job sometimes it can be twice a day sometimes I don't see it for a few days, do you guys have juice defender installed by any chance as thats the only real program which stays running in my background which is extra to the roms I have used, cheers for your input, lets hope we can figure out whats going on.
Bob
Sent from my MB525 using XDA Premium App

I had it to in the past. When i tried to lock the phone it took long time and it wouldn't unlock for a wile 1-2min what is verry long if your waiting and afterwards scrolling was lame.
Don't know what I did, but it's gone now. Now only when out of memory(dhuu!)
I think I wiped it cleen, went to a 2.2 and didn't have it again, now on CM.
Do you see in spare parts any apps using mutch cpu?

Weirdest thing that happens to me..
Every hour/day the phone loads up some applications prepared to start when I turn on the phone..
That means that if I close say, tigertext or Skype, the following day, without turning off the phone, hey are running again.. wtf?
EDIT: A way of checking what's using the CPU, if you're on Froyo, is check the application manager to check for services CPU usage

Yea I have no idea what is causing it but little to no cpu usage when it happens, when I lock on cm7 the tv effect for screen off is super slow motion its really strange, did a clean wipe yesterday and did its first slow down today just before post, cheers
Sent from my MB525 using XDA Premium App

Anyone have any luck with this? Mine just seems to be getting worse and worse on CM7.
Update: I've opened a issue for this on Github. You can go there to post new information / symptoms so that hopefully it can be fixed: https://github.com/Quarx2k/android_device_motorola_umts_jordan/issues/204

Hi dasbin,
Since uninstalling Juicedefender from my phone I have not had this issue once, it has now been 3 days which is probably a record for me so I would say that it was causing me the issue, do you have juicedefender installed? I am now using green power it is much better so far.
Cheers

Random Reboots - FF18

I'm running the stock ICS FF18, rooted. All seemed reasonably well for the first couple weeks, now the damn thing wants to randomly reboot.
I tried wiping, reinstalling the stock ICS, but the problem returned. Reboots happen maybe upwards of a dozen times a day. I've tried isolating the problem but unable to find a common variable...sometimes it happens when I'm in the middle of something, like web surfing or texting. Sometimes it happens when I press the power button, sometimes it happens when it's just sitting there not being touched, sometimes it happens when plugged it, sometimes when not plugged in.
I can't think I have a bad install twice and I'm not finding much on the forums here about others with a similar problem with the stock ICS. So I'm thinking either an app is being a b1tch and causing problems or perhaps something related to the battery? If there was one common theme, it does always happen later in the day or at night after the battery is down below 50%.
Does anyone have thoughts, ideas, suggestions on the likelihood of a bad battery or perhaps someone experienced something similar?

waltcoleman said:
I'm running the stock ICS FF18, rooted. All seemed reasonably well for the first couple weeks, now the damn thing wants to randomly reboot.
I tried wiping, reinstalling the stock ICS, but the problem returned. Reboots happen maybe upwards of a dozen times a day. I've tried isolating the problem but unable to find a common variable...sometimes it happens when I'm in the middle of something, like web surfing or texting. Sometimes it happens when I press the power button, sometimes it happens when it's just sitting there not being touched, sometimes it happens when plugged it, sometimes when not plugged in.
I can't think I have a bad install twice and I'm not finding much on the forums here about others with a similar problem with the stock ICS. So I'm thinking either an app is being a b1tch and causing problems or perhaps something related to the battery? If there was one common theme, it does always happen later in the day or at night after the battery is down below 50%.
Does anyone have thoughts, ideas, suggestions on the likelihood of a bad battery or perhaps someone experienced something similar?
Click to expand...
Click to collapse
Any special wi-fi config? (That's the culprit in my case.)

garwynn said:
Any special wi-fi config? (That's the culprit in my case.)
Click to expand...
Click to collapse
No...never installed the hotspot hack, did have foxfi installed, but did not reinstall after reloading ff18.

im also having the same problem as well, and the problem has became worse and worse,what started off as once or twice a day,is now at least occurring every 10 min.I think im about to downgrade right now to stock gingerbread and see what happens

My phone has always had some amount of random "poweroffs" (not really reboots, I pick up the phone expecting it to be on and it boots from scratch instead). However its much more frequent on ICS (FF18/FH13).

rocket321 said:
My phone has always had some amount of random "poweroffs" (not really reboots, I pick up the phone expecting it to be on and it boots from scratch instead). However its much more frequent on ICS (FF18/FH13).
Click to expand...
Click to collapse
U can always unroot back to el29(gingerbread)i was having the same problems and now i can enjoy my phone
Sent from my SPH-D710 using xda premium

I had that issue on AOKP M6, then realized my power button was actually broken. It would reboot the phone because it was actually stuck down internally. Had to get a new phone.
Sent from my SPH-D710 using xda app-developers app

R0CKSTAR3N3RGY said:
I had that issue on AOKP M6, then realized my power button was actually broken. It would reboot the phone because it was actually stuck down internally. Had to get a new phone.
Sent from my SPH-D710 using xda app-developers app
Click to expand...
Click to collapse
The power button seems to be a common cause of random reboots and that's what I'm leaning towards now as no other software fix has resolved the problem. Supposedly Sprint ordered me a replacement to swap out phones. I'd definitely recommend trying a different Kernel if on FF18 and if that doesn't fix it, try rolling back to EL29.

[Q] Galaxy Nexus Sleep of Death

Problem: Cannot turn on the screen by pressing the power button sometimes. The screen is black or very dim, I cannot tell. One can see nothing on the screen, and it doesn’t accept any touch input, either. The phone still rings if there’s an incoming call. If this happens, the following several presses (about 10 - 20) on the power button will probably lead to a reboot. The “screen auto-rotate” and the proximity sensor may fail after the reboot, but will recover after a manual reboot.
Frequency: Fewer with higher Rom version. About once per day for 4.3.
Other description:
 The problem frequently happens when I just take the phone outside my house/office, and seldom happens when the phone just stays somewhere.
 The problem seems to be irrelevant to the remaining battery capacity or the uptime, but it never happens when charging.
 The problem seems to be irrelevant to the Apps installed.
 The problem seldom happens in the first 3-4 days after flashing a Rom, but happens more and more frequently as time goes by. My guess is some cache is stuffed by some trash, which causes the problem. The phone may be fine as long as the trash can be cleaned up on a regular basis.
 I manually reboot my phone at most every two days.
Solutions tried, but don’t work
 Flashing official ROMs 4.0.4, 4.1.1, 4.1.2, 4.2.2 and 4.3 following the procedure “adb reboot bootloader; fastboot oem unlock; flash-all; fastboot oem lock”, without google wallet, not rooted.
 Turning off the auto-brightness control, as suggested by some post on the Internet.

Does it look like it goes to standby normally or does the screen show gibberish and then turns off?
Sent from my Galaxy Nexus using XDA Free mobile app

Thymo said:
Does it look like it goes to standby normally or does the screen show gibberish and then turns off?
Sent from my Galaxy Nexus using XDA Free mobile app
Click to expand...
Click to collapse
Thank you very much.
I think it's standing-by normally even through the screen is black (or very dim, I cannot tell), since it rings if there's an incoming call. I can see nothing from the screen, and I don't think the screen accepts any touch input, either.
Does this answer your question? Thank you.

Bobby_yan said:
Thank you very much.
I think it's standing-by normally even through the screen is black (or very dim, I cannot tell), since it rings if there's an incoming call. I can see nothing from the screen, and I don't think the screen accepts any touch input, either.
Does this answer your question? Thank you.
Click to expand...
Click to collapse
Thanks.
Was just asking if you had gibberish yes or no. In that case i've got a different issue than you (Suspecting f*cked GPU).
Have you tried a different ROM/Kernel combination maybe it's related to that.

Thymo said:
Thanks.
Was just asking if you had gibberish yes or no. In that case i've got a different issue than you (Suspecting f*cked GPU).
Have you tried a different ROM/Kernel combination maybe it's related to that.
Click to expand...
Click to collapse
No.
No, I just tried the official ROMs. Any suggestion?

Perhaps it's just busy in the background and running low on RAM. Give LagFix a try. Sorry can't link atm as I am on mobile...

eKeith said:
Perhaps it's just busy in the background and running low on RAM. Give LagFix a try. Sorry can't link atm as I am on mobile...
Click to expand...
Click to collapse
Thanks a lot. I'm trying it.

Bobby_yan said:
Thanks a lot. I'm trying it.
Click to expand...
Click to collapse
LagFix does NOT help in my case. Any other suggestions? Thanks.

I've also had this blank screen with calls still ring issue for as long as I can remember, nearly 2.5 yrs.
I've always suspected it's my ROM and so I'd try out another ROM'S, BUT no other ROM works like how I'd like, so I always come back to my ROM.
It doesn't happen every single day, but it does happen very often.
I've tried using apps that auto reboot daily, but eventually this blank screen issue will return.
Unfortunately I can't seem to find any solution, so I just put up with it, it's like the 1 only flaw with my ROM.
&
Not to be at all rude, but I'm really glad op has had this issue from testing other versions of Android, cause then at least I know I don't need to give up my great tablet mode ROM.
LOL

I think I've finally found a work around for this screen of death.
Using Exposed, download/install this module/extension:
Disable Proximity
http://repo.xposed.info/module/com.mrchandler.disableprox
It does exactly what it's name is and ever since then I've not once had to remove my GN battery to work again because the screen went completely dead.

NVM
Screen still goes dead.
Anyone find an actual fix to this?

isajoo,
I had pretty much the same problems with my Galaxy Nexus running CyanogenMod 11 M12.
It got better by doing the following :
Blowing dry air in the earpiece… though the proximity sensor is clearly beside it. Can't do any harm though, I guess.
Settings/Applications/All/menu/Reset applications preferences (or whatever that's called in english) : that seemed to do a lot of good to my phone ! However, it's a very unsatisfactory answer on a technical point of view, as I still don't know WHAT was precisely needed. It's a "magic wand" solution for which I can't give an explanation.
Not specifically related, but greatly helped my phone in the responsiveness area : Trimmer (fstrim) (https://play.google.com/store/apps/details?id=com.fifthelement.trimmer), an updated version of LagFix that you may already know
Hope that helped !
(I wanted to try http://www.androidlegend.com/how-to-perform-proximity-sensor-calibration-on-any-samsung-phone/ as well, but apparently, /sys/class/sensors/proximity_sensor/prox_cal does not exist on my phone…)

Tab S 10.1 Touch Screen Stops Working

Ok so I am having a strange touch screen issues with both mine and my wife's tab S 10.1. It started on mine several weeks ago. When using the device, the touch screen will all of a sudden stop responding. If I press the home button, the device goes to the home screen, it just does not respond to any touch. If I press the power button to put the device to sleep and push it again to turn it back on the screen is working again but it will freeze up again, sometimes in less than a minute. When it first happened I tried to do a factory reset to see if that would help and the problem actually occurred during the initial device setup then so I know it's not related to an App that I have installed. I have sent mine to Samsung now three times trying to get them to fix it. They have replaced the screen once and said that there is nothing wrong the second time (still waiting on the determination of the third time). I have tried to research the issue but have not seen anyone experiencing the same thing. I do not have the rebooting issues that others have mentioned and turning the screen off and then back on does make it work, at least temporarily. I only remember noticing it since upgrading to Android 5 so I am going to try getting the device downgraded to Android 4.4.4 to see if that helps. Wanted to see if anyone had any other ideas. Samsung has basically told me if their techs say there isn't a problem they won't do anything for me.

A few people have mentioned touchscreen problems after upgrading to v5.0.2 mostly 8.4" but some 10.5" have you had any horizontal/vertical lines on the screen.
John.

Tinderbox (UK) said:
A few people have mentioned touchscreen problems after upgrading to v5.0.2 mostly 8.4" but some 10.5" have you had any horizontal/vertical lines on the screen.
John.
Click to expand...
Click to collapse
I have never noticed any lines. I have noticed after the first time at the repair center that the touch screen also seemed to be acting erratically, jumping around when trying to scroll or pan instead of having smooth motion. If I am able to get the device downgraded to KitKat and that improves things, I will just stay there until they figure out what is wrong with Lollipop.

I have stayed on kitkat because of the problems with lollipop, it`s just not worth it to me, but the majority of people don't seem to have any problems with it, I cannot see how upgrading to lollipop affects some touchscreens and not them all, but some people have reported the problem after upgrading i just don't know what to say.
It is normal for the touchscreen to behave erratic if you use it while your tablets is being charged, it is mentioned in the user manual.
I would say you have a faulty touchscreen, do you use a screen protector, have you tried the setting that increases the sensitivity of the touchscreen.
John.

I did not know about the charging item so that might explain the erratic behavior. I thought it might explain the screen locking up too but I know that has happened at times when I am not charging the device. I will be interested to see what happens this time when it comes back the third time from Samsung and whether downgrading my wife's device helps the issue on hers or whether we will need to fight with Samsung about hers as well.

For a couple months, I've had exactly the same problem on my Galaxy Tab S 10.5 (SM-T807V). It comes and goes in severity; some days, I lose all touch input every 5 minutes, it seems, while other days, I can go hours without trouble. Using the device without a case seems to help, as does restarting it, at least temporarily.
I have not sent my device to Samsung, nor have I performed a factory reset. But based on your experience, I'm not sure if either option is worth it.

Hi.
I would suggest removing any screen protector and cleaning the screen looking for any damage, download a touchscreen tester app from google play and testing your screen.
After searching around i found an touchscreen recalibration app for android, but i am very wary of it being fake or causing more damage or that it is for a specific brand of phone/tablet.
EDIT: I used an hex editor, and found this text within the apk file, see photo below.
John.

Well Samsung is finally sending the device back to me. This time they said the found the problem and replaced the main board and updated the software. So we will see what happens when it gets back to me tomorrow.

For anyone who is having this problem like I did. My wife has not had problems since she stopped using the device while it was charging. I have not had problems with mine since it got back related to this but whether that was Samsung fixing the issue or the fact that I also am not using it on my charger, I do not know. So if anyone else if having the problem, try the charger thing; otherwise, you may be looking at some kind of hardware issue that Samsung will have to resolve for you.

Most devices behave erratically while being charged. My HTC does it so does my tab.
Samsung even mention it.

Hi, i am having EXACTLY the same issue. The tab toucj freezes and normalizes if i lock it and unlock it with home button. I think its a software issue.
Sent from my GT-N7000 using Tapatalk

I have two of these from Verizon (T807V) and after updating them to 5.0.2 they both have this same behavior.
Quite annoying.

Any luck finding a cure ? I have noticed that the ram usage gets crazy. Any given time 1.8 gb is utilized out of he 2.77 gb available. I have uninstalled quite a few apps and shut down background processes but still the system is eating too much ram. Can any one help me on how to monitor aap ram usage ?
Sent from my SM-T807V using Tapatalk

Hi.
I was reading the HTC forum as i have qone of their phones, and i read that some people were using an Samsung touchscreen app to boost the touchscreen as they were having problems, the app is called "SGS Touchscreen Booster" link below, The Tab S1 has it`s own touch screen booster in the settings, maybe try that first.
https://play.google.com/store/apps/details?id=br.shop4apps.touchscreenbooster.com&hl=en_GB
http://forum.xda-developers.com/showthread.php?t=1581098
John

siddiqui.nauman said:
Any luck finding a cure ? I have noticed that the ram usage gets crazy. Any given time 1.8 gb is utilized out of he 2.77 gb available. I have uninstalled quite a few apps and shut down background processes but still the system is eating too much ram. Can any one help me on how to monitor aap ram usage ?
Sent from my SM-T807V using Tapatalk
Click to expand...
Click to collapse
That's how android works. Its pointless trying to reduce ram usage if there is still ram to spare.
Android utilises ram not wastes it.

siddiqui.nauman said:
Any luck finding a cure ? I have noticed that the ram usage gets crazy. Any given time 1.8 gb is utilized out of he 2.77 gb available. I have uninstalled quite a few apps and shut down background processes but still the system is eating too much ram. Can any one help me on how to monitor aap ram usage ?
Sent from my SM-T807V using Tapatalk
Click to expand...
Click to collapse
I had multiple problems with 5.0.2, ram hogging, touchscreen problems, my solution was to root and install a custom rom 4.4.4 the tablet is so much more responsive after reverting back to kitkat. I know it's not a solution for everyone but it fixed mine (SM-T800). Just throwing it out as an option.

Used kies today to upgrade to the latest firmware but still the problem continues. I have the Samsung sm t807v Verizon locked. Is there a way I can downgrade it to kit kat? Xda experts are saying it's bootloader is locked
Sent from my SM-T807V using Tapatalk

Steve1698 said:
I had multiple problems with 5.0.2, ram hogging, touchscreen problems, my solution was to root and install a custom rom 4.4.4 the tablet is so much more responsive after reverting back to kitkat. I know it's not a solution for everyone but it fixed mine (SM-T800). Just throwing it out as an option.
Click to expand...
Click to collapse
This is a strange one I used to have the opposite. 4.4.4 every now and then touch screen stopped responding. Pressing power resolved it.
When I upgraded to LL the problem went away.
However I mostly use custom builds. At the moment the best for me is PhoeniX ROM.
Absolutely bug free so far.
Can't say I had any issues with Ironrom either.

ashyx said:
This is a strange one I used to have the opposite. 4.4.4 every now and then touch screen stopped responding. Pressing power resolved it.
When I upgraded to LL the problem went away.
However I mostly use custom builds. At the moment the best for me is PhoeniX ROM.
Absolutely bug free so far.
Click to expand...
Click to collapse
I'm running BlissStalk (discontinued) but I haven't had any issues with it. I was running the CM11 unofficial also without issues. But the stock 5.0.2 it had on it when I purchased it (used) had issues. All my devices eventually end up with a custom rom eventually!
---------- Post added at 02:19 PM ---------- Previous post was at 02:15 PM ----------
siddiqui.nauman said:
Used kies today to upgrade to the latest firmware but still the problem continues. I have the Samsung sm t807v Verizon locked. Is there a way I can downgrade it to kit kat? Xda experts are saying it's bootloader is locked
Sent from my SM-T807V using Tapatalk
Click to expand...
Click to collapse
I flashed stock kitkat firmware via Odin... But it is a different tablet than yours (SM-T800). I found the following thread when I was trying to do it. Just make sure you flash the firmware for your specific model.
http://forum.xda-developers.com/galaxy-tab-s/help/sm-t800-best-to-downgrade-5-0-2-to-t3069929

Bootloader unlocking
So basically searching around the internet to find a kitkat firmware for this. I think it can be downgraded but I need the stock firmware for the sm-t807v.
XDA forums have support for the other variants but for the one I have which is Verizons sm-t807v there are no STOCK firmwares anywhere.
Ashyx and steve if you know any resource, please help me out. I need to get this fixed. I don't have access to any verizon stores where I could go and get this fixed or sorted. It just me and the internet.