Chinese tablets boot loop SOLUTION (works 100%)!!! - Android Q&A, Help & Troubleshooting

Problem description
Tablet is just with power and volume buttons and any of known common combination works, but he dont want to go further from ANDROID letters loop. PC can see it (two disks). but not in ADB (so, no chance to force recovery reboot from PC).
SOLUTIONS
Mainly, chinese manufacturers (for me) for unknown reason apply one (or booth) of two hidden options (some other is not excluded, but 99.99% exist):
1) Performing a simple pin-hole reset (so, look for very tiny hole, much more tiny that mic hole), usually placed near the power button.
2) Simple extended power press upgrade. Procedure is more than simple. Just press and hold power button till appear dialog with system upgrade (you should not to do anything else, tablet will be recovered itself).
Hopefully this will help for peoples in boot loop problems.

Related

Different hard-reset methods for different phones (esp. Verizon)

Hi,
After struggling trying to hard reset my Verizon TP I thought I would share it here. Turns out the same phone but from different carrier might have different hard-reset procedures. For example, everywhere I looked they said to:
1. Turn the phone off
2. Hold VOLUME DOWN and ENTER (center of D-Pad)
3. While holding the above press and release POWER button (although some said to hold them all together until warning screen comes on)
Turns out Verizon TP is totally different. To hard reset you have to:
1. Turn the phone off
2. Press and hold Center D-Pad button (also reffered to as ENTER)
3. While holding that one button, press and release POWER button, but keep holding ENTER.
Amazingly, all those methods are described at the end of each phones User Manual, so there is only one thing if something doesn't work:
RTFM (sadly, that applies to me as well).

[Q] Cherry Mobile Superion won't turn-on

Hi All,
I have flashed EUViewPad 7 based on Stock rom. installed SD Card Booster, CPU Master and etc.
The flash is fine since I managed to boot it and install several apps.
Until I needed to reboot the device since the hacker keyboard always forces to close. I rebooted it and poof I am in infinite boot animation without a way to remove the battery. afraid to fiddle just waited the battery to drain so I can test again(This happened on my O1. just removed the battery, put it back and its ok)
I have drained the battery after almost 8 hours of non stop boot animation. But this device won't turn on anymore. It just vibrates when I press the on button.
Tried opening the back(crap I have scratched the back covering. now it has large scratches ) but the battery is taped . My question folks is what is the possible solution to my problem aside from removing the battery(can't even get to clockword recovery)
Thanks
Not too sure about your device, but doesn't yours have a reset button like the viewpad?
Should be a small hole on the bottom edge right next to the microphone.
Try pressing that with a paperclip if you're having boot problems.
Anyway, if you've drained the battery completely, make sure to leave it charging for a little while. Too low battery voltage will make it unable to start. 15 mins or so should be more then enough.
Try starting with both volume buttons + power pressed. Keep holding it until you see "entering recovery mode."
Let me know if this gives any results.
Amalgation said:
Not too sure about your device, but doesn't yours have a reset button like the viewpad?
Should be a small hole on the bottom edge right next to the microphone.
Try pressing that with a paperclip if you're having boot problems.
Anyway, if you've drained the battery completely, make sure to leave it charging for a little while. Too low battery voltage will make it unable to start. 15 mins or so should be more then enough.
Try starting with both volume buttons + power pressed. Keep holding it until you see "entering recovery mode."
Let me know if this gives any results.
Click to expand...
Click to collapse
Ahh I have that reset button beside the microphone hole. Will try this later on. Thanks for your help and for your custom rom
Uh oh... Tried pressing the small hall beside microphone, pressed on button. No luck. tried pressing that hole and on at the same time No luck again.
Is it possible that it will mess up the whole boot process due to boot animation loop??
silencer07 said:
Uh oh... Is it possible that it will mess up the whole boot process due to boot animation loop??
Click to expand...
Click to collapse
I'm afraid and it sounded like, from your descriptions, that the boot process has been messed up .... so, what do you got to lose by trying to "wake" it up or at least respond to commands, right ?
Try holding the power button & use a small pin to press RESET - leave it connected to the power supply/charging unit.
Try holding both volume Up & Down key & use a small pin to press RESET
Try holding both volume Up & Down key along with the Power button at the same time, and press RESET (you might want to get someone to help you to this)
Try holding the volume Down (left) key & Power button, and press RESET with a small pin.
Does any of these work in getting the screen to show life, be patient as you might have to hold it for 10 to 30 seconds before it cycle & restart/display the 3 birds ...
Chances are you will need to flash a stock ROM with the SULT3 utility, and then if successful, root it again & start over (carefully) - it might work or it might not even connect via usb at all .... worth a try, got nothing to lose at this point.
As a last resort, contact Cherry Mobile and get it repaired & sending it back to the shop .... check the warranty details in your locale, opening the rear case & exposing the battery, might or might not void your warranty coverage.
Hi Letiride,
I have tried the combinations you have specified but no avail. I can't boot this so my PC with correct drivers cannot even recognize i plugged this.
Is my Tablet already bricked?? I have bought this second hand so no warranty already.
Huhuhu Did I already have one of the "Vibrator" Android phone
silencer07 said:
tried the combinations but no avail. I can't boot this so my PC with correct drivers cannot even recognize i plugged this.
Is my Tablet already bricked?? .... bought this second hand so no warranty. (
Click to expand...
Click to collapse
Oh mine, no - if it won't power up or boot into Recovery or FTM mode, I'm afraid it's critical if not officially certified "paperweight". Try uninstalling your PC's usb drivers for the device, or use another computer & install SUTL3 utility from Viewsonic, and see if it can at least beep & signal some USB sequence loading the drivers.
Here's a link to Droid Explorer posted elsewhere in XDA (instead of pointing you to "Search" for it) Install it if you can get the yours powered on, but use it with care as it's a very "powerful" tool to explore all the hidden workings of the Android device(s).
http://forum.xda-developers.com/showthread.php?t=558108
My feeling is that the core image & boot file(s) were corrupted, damaged & overwritten, and it need to be reformatted & reflashed from a stock *.nb0 file, someone with adb might be able to - maybe, just maybe - rescue it.
Let's see if one of our fellow developers might have a better solution on where to begin b/c this is about as far as I can offer - well, you can always put on eBay for parts & hoped you didn't spend a lot as 2nd. hand.
Uhhh looks like i have no other choice but to have this repaired at service center and pay

(FIX) Can't boot into rom, recovery, or download/constant restarts

Hey guys,
This is a possible fix for anyone who is experiencing all of the following issues. If you are NOT experiencing all of these issues then my fix is most likely not the cause of your problem.
1) Can't boot into ROM (phone will get no farther than GALAXY S III logo)
2) Can't boot into RECOVERY (phone will try to boot into recovery but will never make it)
3) Can't boot into DOWNLOAD (you may get as far as the caution screen but phone will turn off)
4) Phone starts, then turns off after about 3 seconds.
The solution that worked for me involves the power switch. It turns out that the reason you are unable to boot is because your power button is constantly being pressed due to a "sticky" button. This is a hardware flaw with only a temporary solution.
Steps to FIX issue.
1. Use fingernail to gently remove POWER BUTTON from phone. Notice that the bumps in the middle of the button are a little off-center.
2. Use a pair of fine tip tweezers to gently PULL on the yellowish/white POWER SWITCH inside the phone.
3. Test the fix by reinserting the battery. If the phone doesn't auto boot then press the POWER SWITCH with the end of your tweezers.
4A. If phone continues to power cycle then return to step 2.
4B. If phone properly boots then reinsert the POWER BUTTON with bumps in the middle aligned with the POWER SWITCH. If you don't align the bumps then the button will not function properly.
Once again, if this fix did not work for you then your problem is most likely in software (bootloader) and not hardware.
Hope this helps someone. Cheers!
Nice to see someone posting something new, glad it worked for you. It would be a good idea to put a caveat that the fix may invalidate a warranty that would otherwise replace the power switch free of charge
The sticky power button will apply to relatively few and though a last chance fix noway round the fact that the phone will fail warranty .
Probably worth trying for those with constant reboots .I would personally try to hold the power button out first if i thought that was the problem .

[Q] Xperia Tablet S (SGPT1211) not responding to reset/boot comands

Hello,
I think I might be at the end of the road with my tablet. I've never rooted it or tampered with it in an way, however yesterday it locked up so I did the usual soft reset (hold power and vol+ for 10 seconds) I then turned it back on and the sony logo popped up, but there it just hung. If I press and hold the power button it switches off, a brief press on the power button brings it back on in the same state. So I go Googling, including looking at threads on this site, all seemed to advise to try to get the Android recovery menu up. on the Sony this is done by holding the power and vol+ and then releasing the power button (only) when the son logo appears (this process to be started when the tablet is off) so I did this, and no response at all. Worse than that, where it would turn on and instantly hang, it now doesn't turn on at all. Hooking it up to my PC I can see the device in device manager, but it tells me my usb device has malfunctioned.
At the moment, my thoughts are to open it up, to:
1. Check that the power/volume buttons aren't stuck in some way (preventing the boot command being given correctly)
2. Remove and resolder if necessary internal battery to force a power cycle.
3. Bin it and get something new (it is 2.5yrs old so no big loss i suppose)
Any ideas where to look or similar experiences?
Thanks

[HOWTO] Force a reboot in TWRP

So the dog tried to eat the phone, thus the bottom part of the screen is dead so there are no software buttons to use.
Now where the problem comes in.
You go into TWRP to see if you can make a more resent backup but you can't see enough due to the strips on the screen and since the software buttons are gone you're stuck and it will lock itself and you can't even swipe to unlock. Since newer phones don't allow the battery to be pulled you're stuck until you run it down which will take days.
TWRP and any other recoveries should reboot when the power button is held down IMHO but obviously they don't. Few things are more annoying than something electrical that you can't turn off.
I found that if you hold down the volume up and volume down buttons then press and hold the power button it will force a reboot.
Forced power off is holding power down and power button: https://www.verizon.com/support/knowledge-base-215164/
This is also provided as a popup instruction when you first boot the phone after setup. So, there is a way to force it off, just not with a single button as you might prefer.
You may have found another option with the reboot process.
I can confirm this procedure worked on my Redmi Note 4 (MTK) stuck in TWRP after I executed "/sbin/recovery" from adb shell, which killed the touchscreen and USB connectivity (??). The standard way (volume down + power) did not work, but this volume up + down + power worked, strangely enough.

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