Tab 4 7.0 bootloop. - Galaxy Tab 4 Q&A, Help & Troubleshooting

The device is a sm-t237p. I'm not going to go into serious detail but basically here goes: Brother wants me to root tablet. I don't know how to use Samsung devices so I decide to take the easy path and use KingoRoot. Now its in a boot-loop. I've tried wiping data and cache, but it just turns on, goes to the sprint and spark screen, turns off, vibrates and turns back on, repeat. The only way I've found to keep it off is to go into recovery and select power off. How can I restore the stock firmware and get it working, and I'd prefer to use Linux, but I can use Windows.

Following this is probably going to be your best bet.
https://forum.xda-developers.com/tab-4/general/guide-how-to-restore-stock-firmware-t2979006

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Tab issues: won't do a thing....

Ok, before I get flamed, I did search (and search and search and search)...
Here's the back story. I have a VZW Galaxy Tab, and I was running OldMacNut's Honeycomb alpha on my tab... I wanted to be able to use 3G, so I wanted to use another ROM, so I attempted to flash one through recovery. It failed everytime I tried, so I went back to Heimdall and did a clean original stock download, and everything went wonderful...
Me, not being able to leave the damn thing alone figured I would root it, and then throw CWM back onto it, then install the GB rooted ROM on... Well, when I ran CWM it converted the the file extention, and when it went to reboot, it just boot looped.
So I held the power button down, and shut it down. I had it plugged into the charger and walked away from it for a few minutes to take care of something else, and when I came back to it, the sceen showed the battery icon like it was charging, but a multi-lined circle in the middle of the battery, and the green moving part of the battery wasn't working like I have seen on the Galaxy S devices...
I went to try to turn it back on, and nothing happened, so I researched some, and left well enough alone and let it charge.
Now, the battery icon isn't even on the screen, and the screen stays black all the time.... No matter any combination of buttons or screen holds I do, it isn't turning back on now, even while it is plugged directly into the wall.
I'm at a lost.
Any help would be AWESOME!!!!
THANKS IN ADVANCE!!!!!
EDIT: I let the Tab sit for a LONG time, and I got the battery icon thing back... Still afraid to try anything else atm.
PLEASE PLEASE HALP!!!!!
Can you get to download mode?
Tabulous said:
Can you get to download mode?
Click to expand...
Click to collapse
That's the issue... I can't. I've tried and tried. I left the tab plugged in overnight, so I'm hoping that it at least is fully charged now, so I can try to mess with it today some.
here's what you should do. let's start from the very beginning.
1. download heimdall. get it here: http://forum.xda-developers.com/showthread.php?t=755265
2. download the stock verizon files. get them here: http://www.blackmugmedia.com/Android...n/VZW Stock/
you need all four files.
3. download the drivers for the samsung sch-i800. find those here: http://downloadcenter.samsung.com/co...v1.3.350.0.exe
4. unzip heimdall. go into the drivers folder, and run zadig.exe. at the top, select 'list all devices'. go to the dropdown menu, and select Samsung Composite USB (i'm pretty sure that's what it was called.) click start, and let it run.
5. open the heimdall front end.
6. put system in system (if you're flashing to ec02, then put factory in system) put cache into cache put param into param put the zimage into both the kernel and recovery slots.
7. turn your tab off, and plug it into the computer using USB. hold down the power and the volume down buttons until you see the little droid dude with a shovel.
8. click the start button on heimdall.
9. wait for the flash to complete (don't unplug your device, obviously, during the flashing.) once your phone reboots, it's okay to unplug it.
10. now, boot into the stock recovery, and wipe data and cache. update to ec02
11. enable usb debugging.
12. plug your phone back in to the computer.
13. now run superoneclick for root. get that here: http://forum.xda-developers.com/showthread.php?t=803682
14. either play with it in stock, or go find oldmacnut's excellent Better Than Life Rom, and follow the instructions to flash that.
15. enjoy your tab!
Hit me on the thanks button if you find it useful ; )
Sent from my Galaxy Tab using xda premium
That's good advice for some people infinity, but as detailed in the immediately prior post, the OP cannot access Download Mode, rendering your instructions unworkable. Without either Recovery or Download modes, there's not much you can do unless you're willing to try the UnBrickable Mod (search for it).
Hope that helps.

[Q] NFC error puzzle. USB debug not an option

Two days ago my wifes 1st generation Nexus 7 refurb started giving the "Unfortunately, NFC service has stopped" error. You click OK and the error instantly pops up again. There is a moment to click on something if you're fast and I've been able to click on settings but when settings opens it's nothing but a black screen with no options. This means that I can not enable usb debugging. I have tried quite a few different processes, ADB sideload, going through the bootloader, but they all seem to require usb debugging and the tablet is never recognized. The tablet is stock but I have no way of knowing what version of android it is currently running with the blank settings window (unless you can give me a tip on that). Have done two wipe/factory restores on it and the error comes up right at the first boot screen. I am willing to pursue any option to get this tablet in working order. Rooting, flashing, whatever but I am a novice in the world of android rooting. It was purchased off groupon (won't make that mistake again) and the 14 days are past so If I have to send it in, it's cash money out of our pockets.
Do I have any options? Thank you for your time!
Most frustrating of all is that everything else about the tablet seems to be functioning normally. I can install apps from google play. I can't really run many of them though.
notnorm said:
Most frustrating of all is that everything else about the tablet seems to be functioning normally. I can install apps from google play. I can't really run many of them though.
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Click to collapse
If the tablet has never been rooted, and the factory reset procedure seemed to complete successfully, then your symptoms suggest that something is wrong with the /system filesystem - which, for stock devices is never modified (always mounted read-only).
So that in turn suggests *perhaps* flaky hardware - probably the flash memory chip - that has gone awry and is the root cause of the problem.
It is conceivable that you could go through the process of unlocking the bootloader and re-flash a Google-provided "factory image", and that the problem will go away. But if the root cause is really a flaky flash memory chip, it will very likely return with a vengeance, and your efforts will be for naught.
There is something missing in your narrative, however - if the appearance of the "NFC Service has stopped" dialog on-screen prevents you from interacting with your (intended) foreground apps, how were you able to perform a factory reset and then follow that up with a tablet configuration? (e.g. to get Google credentials on the tablet so you could push apps to it by using a PC Web browser from the Google Play market).
If you are unfamiliar with rooting but still want to proceed with reloading the factory images, you will have to follow the Stock Recovery tutorial threads. Many users - especially those with Windows machines - seem to get stuck at this step, although truth be told that has nothing to do with Android, and everything to do with Windows Driver Installation Hell.
Note - specific to your situation.. You do not need to enable USB debugging to re-flash factory stock images. You only need to communicate with the device (booted into bootloader mode) with the "fastboot" program. For this you only need working USB hardware - not "adb".
good luck
BTW, note that you can perform a factory reset in the stock recovery without launching it from the O/S. The sequence is:
1) Turn the tablet off (not screen off, but powered completely off)
2) Boot into bootloader mode by holding Power+Vol-Down together (hold them down until android lying on its' back shows up - about 4 seconds)
3) Using the vol-up/vol-down button, select "Recovery Mode" on screen and press the power button
At this point the screen will go black. Wait about 10-13 seconds. The screen will remain black even though the stock recovery is now running. To get the screen to show the (stock) recovery menu,
4) press and release the Power & Vol-Up keys simultaneously.
The stock recovery menu should show now up. If it doesn't, try again. (After 60 seconds if you have done nothing, the tablet will reboot to the "normal" OS).
5) Use the on-screen menu to perform a factory reset (follow the directions on-screen for key usage).
Thank you so much for your response! The unanswered question is that I managed to put in the network info and what not during setup by hitting OK on the error and tapping the letter in the moment before the error popped up again. Not a fun task!
I've been trying to flash and after installing the google usb drivers it's still doing the <waiting for device> for infinity. I think I will have to bite the bullet and send it in. You saying that it might be a flash chip is kind of comforting because I think I might have bashed my skull against this issue forever before giving up!
Chris
flashed the wifi fix for the TMObile us version (from the X Note rom page)and was able to get out of the loop.

[Q] AT&T LG G2 won't boot

I've been messing around with my phone, trying to flash CWM and CyanogenMod (to no avail), and yesterday something happened. I woke up, my phone was dead so I started charging it. It booted into the Stock OS (the one that ships with the G2--build D20010o I think). Shortly after, a message appeared on the screen about an update the phone was going to install (I'm assuming one that AT&T was pushing to my phone), and shortly after it powered down on its own. I have not been able to get it to boot into the OS since.
Before all of this happened, I rooted the phone with IORoot, tried to flash CWM (I think successfully), but was not able to install CyanogenMod, so I flashed an earlier build of the stock OS (D20010o), rooted it again (I'm not sure that I had to--I think it stated that my phone was already rooted), tried to flash CWM again (unsuccessfully this time), and I gave up. Then this problem occurred.
Every time I try to power on the phone, the LG logo flashes, and the screen stays on, but it's black. If I try to do a factory reset via the hardware buttons, I am able to see that screen, but as soon as I follow the instructions of pressing the power button twice, it says that it's initializing the reset, but then the phone's screen goes black again--not sure if the screen is on or off, though. The LED light is also not on during any of this.
I'm unsure what to do. I've had the phone for about 6 months, but I had not owned an Android before that--iPhone user for 3 years. I obviously did not do enough research or ask enough questions, but I would like my phone to be in a usable state. I would greatly appreciate any help that anyone can give me!
NEVER take an OTA with a recovery.
Use the lg flash tool to go back to stock
http://forum.xda-developers.com/showthread.php?t=2432476
Sorry, should have also mentioned that I can't boot into Download Mode. I'm assuming there's no .kdz file for AT&T, and the other method in that link requires Download Mode. :/

I tried rooted and now I'm stuck at verizon screen

It won't boot past the verizon screen. I've tried wondershare dr phone recovery but it says i have to enable USB debugging and come to find out it doesn't even support samsung galaxy s7. SM-G930v. I have literally tried everything to my knowlege to get this thing to stop. Like pressing volume down + power and then going to wipe factory reset. Wiping cache. Everything I can think of. Is there any advice yall can give me to help me with this?
maybe there is a way i can flash something to take the verizon screen off?
brandon110 said:
It won't boot past the verizon screen. I've tried wondershare dr phone recovery but it says i have to enable USB debugging and come to find out it doesn't even support samsung galaxy s7. SM-G930v. I have literally tried everything to my knowlege to get this thing to stop. Like pressing volume down + power and then going to wipe factory reset. Wiping cache. Everything I can think of. Is there any advice yall can give me to help me with this?
maybe there is a way i can flash something to take the verizon screen off?
Click to expand...
Click to collapse
You should be able to boot into download mode by holding home volume down and pressing power. Then you be able to use Odin and flash back to stock. In the root thread follow the unroot instructions. You will need to download the stock image.
thanks
that is what i am doing is flashing back to stock that is what my next method is going to be. thank you so much.
Solved!!!!!!!!!!!!!!!!!! But dont delete this people might wanna read this

I need to recover from bootloop without losing data

I was trying to get some data off of a T-Mobile LG G2. Unfortunately, the phone tried to fight with me, so I decided to root it to get around the bull**** because electronics that fight with me always get taught a lesson. The phone has been rebooted several times since then, but on one particular reboot, the phone decided to strike back at me and not actually boot up, and it has never booted up since. I get stuck on the LG logo with the smoothly transitioning green/blue LED. And this is where I'm stuck, but I won't let a phone defeat me. It would be nice if I could get the phone working, but I don't care about the phone itself that much because the phone has already been replaced. I only need some of the data from it. (It was not backed up because it is my mom's old phone, not mine, and my mom is an idiot.) I can think of several ways to proceed.
1. Try to fix it with recovery mode. Unfortunately, the built in recovery mode only offers a factory reset, so I would have to install TWRP with download mode first. Except from my research it seems like I can only flash the main OS with download mode, overriding the data in the process, and I'd have to use a Windows machine to do it.
2. Somehow get access to ADB and use that to do anything that has to be done. USB debugging is enabled, but as far as I can tell, ADB only runs when Android is fully booted. Which obviously doesn't happen anymore.
3. Boot into fastboot mode and do stuff from there to get it back up. It seems like in order to make it do that, the phone has to be unable to pass execution to whatever boot mode I try to boot it into (whether that's Android, download mode, or LG's ****ty excuse for "recovery" mode). If that's right, it means that the phone is not broken enough and I need to somehow break it more.
What should I proceed with, and how should I go about it? If none of these are good ideas, what should I do instead?

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