Samsung A21s bootloop - Samsung Galaxy A21s Questions & Answers

Hey there, I'm stuck in a boot loop in my samsung galaxy a21s with the bootloader warning and the press power key button showing.
I used magisk to flash a custom rom and used odin to add it to my device. I'm kinda a novice when it comes to rooting so any help to getting out of the boot loop will be appreciated.

It will not boot to recovery or the download mode either

Fixed it! I just had to press volume UP and DOWN along with power until it rebooted and then afterwards I pressed volume UP and POWER to get to the download mode.

synnre said:
Fixed it! I just had to press volume UP and DOWN along with power until it rebooted and then afterwards I pressed volume UP and POWER to get to the download mode.
Click to expand...
Click to collapse
Very good to know , and thank you for putting it as you solved

Hey @synnre,
I have the same problem with the phone. It also shows "fingerprint protection failed" in the top left corner on booting screen.
The button combination you mentioned is not working.
Do you have any other ideas?
Thankful for any help!

Related

[SOLVED] How to go into boot recovery LG Optimus Black P970

A boot loop happen after i tried installing cyanogenmod 7 early realease from this forum. Now the device stuck in boot and will display cyanogenmod 7 blue circle around 3 -4 seconds over and over. Can anyone of you help me because i think i need to do a factory reset, but now it stuck in boot loop and it does not have a key combination to go into recovery mod. Help
Noone answer till now...
There is a key combination. Search it on google. How to boot lg optimus (your model) into recovery. Once in wipe data then wipe cache
Sent from my Nexus S using XDA App
Expansion
From searching other forums and google I found the following:
You can enter update mode by removing the battery, then while holding down the VOL + button plug in your usb cord(i assume while it's connected to your computer).
Then you can search the forums here and find:
[LG P970] Upgrade Kit 3.5
(the title is longer than this i just didn't put it all in here due to laziness)
This should help you in your quest of retrieving your phone from light up paperweight status. I don't really know though. Since I've never used your phone. Good luck.
recovery mode
you need to press the home button,volume -, and power,
to enter to the recovery mode.
sorry for my bad english.
Does not work on the LG-P970g from Telus aka Optimus Black
To get into Recovery mode :
Press and hold Volume down + Home key
then press and hold the above combination and also press and hold power button for a while
You'll get into Recovery mode
Hope it helped :angel:
awesomestvi said:
To get into Recovery mode :
Press and hold Volume down + Home key
then press and hold the above combination and also press and hold power button for a while
You'll get into Recovery mode
Hope it helped :angel:
Click to expand...
Click to collapse
works!!!!!!!!!!!!!!!11
Home Key?
but which key is home key on lg optimus p970?
can anyone please tell me the key combination for optimus black p970 to get into recovery mode.
i have cwm touch installed and can get into recovery mode with aneboot application.
but now i am stuck in bootloop. please help.
raevilman said:
but which key is home key on lg optimus p970?
can anyone please tell me the key combination for optimus black p970 to get into recovery mode.
i have cwm touch installed and can get into recovery mode with aneboot application.
but now i am stuck in bootloop. please help.
Click to expand...
Click to collapse
The Home key is actually the touch key on the Optimus Black..it's not a button but a touch input
The combination is the same as above :good:
Vol Down + Home not working for me! Straight booting into cm10.1
awesomestvi said:
To get into Recovery mode :
Press and hold Volume down + Home key
then press and hold the above combination and also press and hold power button for a while
You'll get into Recovery mode
Hope it helped :angel:
Click to expand...
Click to collapse
Doesn't work when you power up your device with those keys.
Power on your device before you press the key combination.
Took me a frustrating half an hour to find out...
washbeer said:
Doesn't work when you power up your device with those keys.
Power on your device before you press the key combination.
Took me a frustrating half an hour to find out...
Click to expand...
Click to collapse
can you please explain in a little more details?
tried to get into recovery with the instructions, but a straight boot!
BTW I am on stock gingerbread ROM rooted!
power up your phone, then press and hold vol down + home key and then also press and hold the power button until the phone restarts. then it should boot into recovery.
btw i made a small video tutorial
youtube.com/watch?v=Iu4O_zvrn6U
washbeer said:
power up your phone, then press and hold vol down + home key and then also press and hold the power button until the phone restarts. then it should boot into recovery.
btw i made a small video tutorial
youtube.com/watch?v=Iu4O_zvrn6U
Click to expand...
Click to collapse
Just watched your Youtube-Tutorial.
Thank you. Finally i can boot into recovery
washbeer said:
power up your phone, then press and hold vol down + home key and then also press and hold the power button until the phone restarts. then it should boot into recovery.
btw i made a small video tutorial
youtube.com/watch?v=Iu4O_zvrn6U
Click to expand...
Click to collapse
this dont work for me
vladnosferatu said:
this dont work for me
Click to expand...
Click to collapse
power up your phone, when the buttons start to blink (or the cm logo appears or whatever boot logo you have) press and hold vol down then press power button (home key is not really needed like the video ) . it also works on stock rom if you have a recovery installed.
note that it won't work at the early bootup when the lg logo appears or when android is booted and ready.
washbeer said:
power up your phone, when the buttons start to blink (or the cm logo appears or whatever boot logo you have) press and hold vol down then press power button (home key is not really needed like the video ) . it also works on stock rom if you have a recovery installed.
note that it won't work at the early bootup when the lg logo appears or when android is booted and ready.
Click to expand...
Click to collapse
Thanks a lot ! :laugh: You almost saved my life ! USB PC connexion don't work, I couldn't do anything else than achieving booting recovery without adb.
washbeer said:
power up your phone, when the buttons start to blink (or the cm logo appears or whatever boot logo you have) press and hold vol down then press power button (home key is not really needed like the video ) . it also works on stock rom if you have a recovery installed.
note that it won't work at the early bootup when the lg logo appears or when android is booted and ready.
Click to expand...
Click to collapse
It takes me in safe mode, i'm not even sure what it is (I guess is something similar to window's? It has less apps when I am in safe mode!
I'm not sure what to do, I tried to reboot in recovery mode with the ROM manager but it doesn't work (nothing of the ROM manager works actually).
Any ideas on what safe mode is?
Thanks!
UPDATE:
I tried this app to reboot in recovery mode
play.google.com/store/apps/details?id=com.siriusapplications.quickboot&hl=en
It rebooted the phone, the android robot showed up with some stuff turning in the stomach (like this: upload.wikimedia.org/wikipedia/commons/7/76/Android_Update_Screen.JPG) and then it turned on normally except that all my data now is gone (which is not a problem since I wanted to wipe it from the recovery mode, the problem is that I still can't get into recovery mode!
P.S.: it wouldn't let me post normal links because I'm a new member, I hope I didn't break any rule posting them like this! (after all it's not spam!)

Can't access recovery menu. Is my 10.1v bricked?

So I installed this ROM (http://forum.xda-developers.com/showthread.php?t=1200985) a few days ago w/o much trouble. Today I updated the ROM to version 2.4 (first used wipe.zip and then the rom). When I rebooted my tab I got stuck at a bootloop (the ROM's logo keeps showing up) and it seems I'm unable to get into recovery.
AFAIK, I should get into recovery by pressing the VOLUME UP & and the power button simultaneously, but nothing happens when I do this. Getting into fastboot isn't a problem, but I just can't seem to get into recovery mode.
Can I access my recovery menu through the fastboot via the SDK manager? Did I use the correct buttons to get into recovery?
Thanks in advance
You should push on both Power Button and Volume Down buttons. Right after the Samsung logo shows, you will see two menus, let go of both buttons immediately and choose your recovery boot. i hope this will help your problem

Help! Cannot Boot Into Recovery

So I'm trying to boot into the bootloader so I can enter CWM, but for some reason whenever I hold the power and volume down buttons my Galaxy Tab 10.1 WiFi just keeps showing me the "Samsung Galaxy Tab 10.1" splash screen and will just stay in a boot loop of that until I release power and volume down, at which point it will enter a normal boot and start up normally.
What am I doing wrong or what is the problem? I rooted back when I was on 3.1 and I did the OTA update to 3.2. Could it have something to do with that?
Please help. Thanks!
You have to leave the power button alone without leaving the volume button when you see the logo.
Just so you know, 3.1 with CWM and doing an OTA update will result in removal of your CWM. That's probably why you aren't getting it down right, that or you aren't pressing the right combo buttons.
Was pressing the wrong button combo lol. Thanks guys, I got it!

[Q] My galaxy s3 suddenly off and keep restarting!!!

Hello, (Sorry for my bad English)
I have Samsung Galaxy S3 GT-I9300 not rooted and I have had it working fine for at least 7months now. Yesterday it suddenly off and keep restarting and not going into touch-wiz i am not familiar with android platform. I have tried to get into download mode (power + volume-down + menu button) and in recovery mode (power + volume-up + menu button) after getting into recovery mode android logo disappears quickly then restart and also getting into download mode phone shows the warning page i press the volume up button to get into download mode but phone restart.
I had removed the battery for one day and put it back and phone start auto without pressing the power button and it goes to start up Samsung galaxy logo then restart and keep restarting. Now, whenever i put the battery back phone start auto and keep restarting.
I need help what should i do?
Maybe power button got stuck?
Power button is working fine
emressazeri said:
phone start auto without pressing the power button and it goes to start up.
Click to expand...
Click to collapse
It certainly sounds like the power button is shorted out, send for warranty repair.
Need Help
emressazeri said:
Hello, (Sorry for my bad English)
I have Samsung Galaxy S3 GT-I9300 not rooted and I have had it working fine for at least 7months now. Yesterday it suddenly off and keep restarting and not going into touch-wiz i am not familiar with android platform. I have tried to get into download mode (power + volume-down + menu button) and in recovery mode (power + volume-up + menu button) after getting into recovery mode android logo disappears quickly then restart and also getting into download mode phone shows the warning page i press the volume up button to get into download mode but phone restart.
I had removed the battery for one day and put it back and phone start auto without pressing the power button and it goes to start up Samsung galaxy logo then restart and keep restarting. Now, whenever i put the battery back phone start auto and keep restarting.
I need help what should i do?
Click to expand...
Click to collapse
Did u fix it.....If yes tell me how
emressazeri said:
Hello, (Sorry for my bad English)
I have Samsung Galaxy S3 GT-I9300 not rooted and I have had it working fine for at least 7months now. Yesterday it suddenly off and keep restarting and not going into touch-wiz i am not familiar with android platform. I have tried to get into download mode (power + volume-down + menu button) and in recovery mode (power + volume-up + menu button) after getting into recovery mode android logo disappears quickly then restart and also getting into download mode phone shows the warning page i press the volume up button to get into download mode but phone restart.
I had removed the battery for one day and put it back and phone start auto without pressing the power button and it goes to start up Samsung galaxy logo then restart and keep restarting. Now, whenever i put the battery back phone start auto and keep restarting.
I need help what should i do?
Click to expand...
Click to collapse
this happened to me once. i removed the battery for a few minutes. then put it back and immediately entered the recovery mode. i hold the combo for a long time so that the samsung logo appears for 3 times and after the 3rd time, i released the combo and it entered the recovery mode. may/may not work for you. but worth trying? sounds funny but worked for me unexpectedly!!
sriram231092 said:
this happened to me once. i removed the battery for a few minutes. then put it back and immediately entered the recovery mode. i hold the combo for a long time so that the samsung logo appears for 3 times and after the 3rd time, i released the combo and it entered the recovery mode. may/may not work for you. but worth trying? sounds funny but worked for me unexpectedly!!
Click to expand...
Click to collapse
I got fixed by Samsung Customer Service Center. I t was a hardware problem.
emressazeri said:
I got fixed by Samsung Customer Service Center. I t was a hardware problem.
Click to expand...
Click to collapse
glad to hear that

Galaxy S3 no power button, stuck at boot loop after flashing 6.0 cyanogenmod 13

Hi everyone,
I flashed the newest ROM from cyanogenMod to my old galaxy s3. I did this with the phone still on. After flashing, the phone is stuck in a boot loop. The problem is that I have removed the power button completely because it was faulty(even from the board). Has anyone had the same problem, or has any ideas what to do?
Thanks
dragonilly said:
Hi everyone,
I flashed the newest ROM from cyanogenMod to my old galaxy s3. I did this with the phone still on. After flashing, the phone is stuck in a boot loop. The problem is that I have removed the power button completely because it was faulty(even from the board). Has anyone had the same problem, or has any ideas what to do?
Thanks
Click to expand...
Click to collapse
I never had the same problem but you can try to hold vol + and home to go in recovery mode, or vol - and home for download mode
I don't have a power button. What you're saying can be done if you press those buttons along with the power one.
dragonilly said:
I don't have a power button. What you're saying can be done if you press those buttons along with the power one.
Click to expand...
Click to collapse
buy a USB JIG is a device that automatically enter download mode
Short the power button connections, if you can get at them.
Beamed in by telepathy.

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