M21 logo loop, can't access recovery - Samsung Galaxy M21 Questions & Answers

My mum tried to do the last update on her phone, during which most probably battery ran out - now phone is basically a brick.
When turned on it's stuck on logo loop, rebooting itself every 5-10 seconds or so vibrating once and repeating. When unplugged or plugged into the wall none of the button combinations work - the phone basically ignores everything.
When plugged to PC via USB I can invoke "updating process"? with Volume Up + Power / Volume Up combination, which should lead me to recovery menu - instead the phone goes into "update", loads bar up to 25%, gets stuck for about a minute or so, reboots and goes into logo loop.
Hard reset also "works" when plugged into PC - update screen shows up, gets stuck on 1%, phone gets hard rebooted, update comes up again, goes up to 25%, reboots and on to the logo loop...
Can I even somehow get into recovery mode to wipe cache to allow the phone to get update again or even wipe data to flash custom ROM? Screw data, I just want to make it work and not have a brick lying on the desk...

UnableToSee said:
My mum tried to do the last update on her phone, during which most probably battery ran out - now phone is basically a brick.
When turned on it's stuck on logo loop, rebooting itself every 5-10 seconds or so vibrating once and repeating. When unplugged or plugged into the wall none of the button combinations work - the phone basically ignores everything.
When plugged to PC via USB I can invoke "updating process"? with Volume Up + Power / Volume Up combination, which should lead me to recovery menu - instead the phone goes into "update", loads bar up to 25%, gets stuck for about a minute or so, reboots and goes into logo loop.
Hard reset also "works" when plugged into PC - update screen shows up, gets stuck on 1%, phone gets hard rebooted, update comes up again, goes up to 25%, reboots and on to the logo loop...
Can I even somehow get into recovery mode to wipe cache to allow the phone to get update again or even wipe data to flash custom ROM? Screw data, I just want to make it work and not have a brick lying on the desk...
Click to expand...
Click to collapse
Have you tried using reiboot-for-android.exe by Tenorshare Co Ltd? Might help. Or if the device is within warranty then try Service Centers for that device.

You can try flashing stock rom from odin.
Download your current stock rom from samfw.com and extract the zip file.
Install odin and samsung usb drivers (link) and reboot your pc.
Reboot into download mode from your phone and press volume up:
Keep USB connected, Hold Volume Down and Power buttons, When screen turns off, hold Volume Up and Volume Down buttons
Click to expand...
Click to collapse
Open odin and load the files:
AP = AP*.tar.md5, BL = BL*.tar.md5, CP = CP*.tar.md5, CSC = CSC*.tar.md5
Click to expand...
Click to collapse
Click flash and wait till it says pass
Press and hold volume down and power to reboot. The first boot can take a while. Hopefully this will fix it.

Related

[Q] Galaxy Tab GT 1000N won't start

Day 1
Hard reset my device. After rebooting, my tab stuck at Samsung logo and vibrating. But still can enter download mode
Day 2
The device still stuck at Samsung logo and can enter download mode. Then i tried flashing with dbdata.rfs PDA via Odin to try my luck. After reboot , the same things goes up,stuck at Samsung logo. After few minute , i tried flashing the GT-P1000_PRT_P1000XWJQ9_P1000PRTKL1_P1000XXJPZ ROM.During flashing(i don't know either it's finish already or not or either battery problem.Before flash i noticed the battery has low power about less than 10%) ,the device suddenly shutdown by it self. After the shutdown, the device goes black and try to reboot again,nothing comes up.Then i thought the battery was fully drained out, then i decide to charge up till morning.
Day 3
Trying to power up the device but nothing happen.Holding the power button about 20 sec and nothing happen but the device feel a little bit hot at the back.But when i plugged in to USB, it can detect the device and show the MTP Installation has failed.But at My computer shows 2 removable disk which comes from the device it self.After i pressed it,it say Please insert a disk to removable disk.
Can anyone please help me?Help my Old Tab.
Sounds like you have bricked your device. And I mean a real brick, not a "soft brick" as some people like to call it.
You should never try and flash your device if you have low battery as power could fail and corrupt your bootloader.
If you cant get into recovery or download mode your screwed and need to send it away for JTAG fix or board replacement.
Zelz said:
Day 1
Hard reset my device. After rebooting, my tab stuck at Samsung logo and vibrating. But still can enter download mode
Day 2
The device still stuck at Samsung logo and can enter download mode. Then i tried flashing with dbdata.rfs PDA via Odin to try my luck. After reboot , the same things goes up,stuck at Samsung logo. After few minute , i tried flashing the GT-P1000_PRT_P1000XWJQ9_P1000PRTKL1_P1000XXJPZ ROM.During flashing(i don't know either it's finish already or not or either battery problem.Before flash i noticed the battery has low power about less than 10%) ,the device suddenly shutdown by it self. After the shutdown, the device goes black and try to reboot again,nothing comes up.Then i thought the battery was fully drained out, then i decide to charge up till morning.
Day 3
Trying to power up the device but nothing happen.Holding the power button about 20 sec and nothing happen but the device feel a little bit hot at the back.But when i plugged in to USB, it can detect the device and show the MTP Installation has failed.But at My computer shows 2 removable disk which comes from the device it self.After i pressed it,it say Please insert a disk to removable disk.
Can anyone please help me?Help my Old Tab.
Click to expand...
Click to collapse
Try this:
start odin, and press power + volume down for at least 5 seconds, plug to your computer
Odin should recognize your tab. Flash again. Btw jq8, sithout the correct kernel is not for p1000n/m/l.
What u did on day 3 was ALMOST right. But you didn't press the volume down. Hence you didn't go to download mode.
P.s. if you post this in the Q&Asection, we could hv helped you earlier.

[Q] Bootloop help (cannot access fastboot/adb)

Note: This is a re-post from the Verizon HTC forums (http://forum.xda-developers.com/showthread.php?t=2533042)
I just rooted and S-off my HTC via rumrunner.
No flash roms install or custom recovery installed.
I wanted to see if I still had CWM from my last root (I returned to stock via http://forum.xda-developers.com/show...highlight=s-on.
So I went into the bootloader or fastboot (I don't remember) and hit recovery. This did not send me to a CWM, but it appeared to be the stock version of recovery. The process took too long (I know impatient) so I turned it off via power button + volume down.
Now I come to you in need, my phone is constantly turning off/on only displaying the green htc text, no red text, then pausing for 8 seconds, then off again to black screen. The whole process lasts 12 seconds, and this had been going on for about 10-15 min atm.
Plugging it in, my computer does not have the time to recognize it with adb, or fastboot.
I cannot use the power button + volume down to go into bootloader, and pressing the power button does nothing.
Please help me.
So here's the update.
Screen is now black, meaning the boot up/down process has stopped.
I have tried these:
A. Hold down the volume down + power button for 20+ seconds.
B. Hold down the volume up + volume down + power button for 20+ seconds and let up on the volume up button when screen goes black.
These two methods results in a single boot up to green HTC text then black screen.
I suspect the device has lost most of its power. Tried it for a third time, the device is now unresponsive and remains at black screen.
Now I plugged the usb cable connected to the power adapter.
The device enters the aforementioned continuous boot loop.
I tried method A and B, and there are no results, the boot loop continues. Now the device returns to the low or no powered state.
Now the device is connected to the computer. The same happens as if it were connected to the power adapter.
Method A and B still do not work.
Results: holding down buttons longer do nothing for me. The device seems to have lost power, but when charged, immediately the device enters the boot loop state.
Note: when doing method A and B the trials were done when screen is on and when screen is off, still no results.
Now the screen is off and not connected to anything. The problem still persists.
geeibara said:
Note: This is a re-post from the Verizon HTC forums (http://forum.xda-developers.com/showthread.php?t=2533042)
I just rooted and S-off my HTC via rumrunner.
No flash roms install or custom recovery installed.
I wanted to see if I still had CWM from my last root (I returned to stock via http://forum.xda-developers.com/show...highlight=s-on.
So I went into the bootloader or fastboot (I don't remember) and hit recovery. This did not send me to a CWM, but it appeared to be the stock version of recovery. The process took too long (I know impatient) so I turned it off via power button + volume down.
Now I come to you in need, my phone is constantly turning off/on only displaying the green htc text, no red text, then pausing for 8 seconds, then off again to black screen. The whole process lasts 12 seconds, and this had been going on for about 10-15 min atm.
Plugging it in, my computer does not have the time to recognize it with adb, or fastboot.
I cannot use the power button + volume down to go into bootloader, and pressing the power button does nothing.
Please help me.
So here's the update.
Screen is now black, meaning the boot up/down process has stopped.
I have tried these:
A. Hold down the volume down + power button for 20+ seconds.
B. Hold down the volume up + volume down + power button for 20+ seconds and let up on the volume up button when screen goes black.
These two methods results in a single boot up to green HTC text then black screen.
I suspect the device has lost most of its power. Tried it for a third time, the device is now unresponsive and remains at black screen.
Now I plugged the usb cable connected to the power adapter.
The device enters the aforementioned continuous boot loop.
I tried method A and B, and there are no results, the boot loop continues. Now the device returns to the low or no powered state.
Now the device is connected to the computer. The same happens as if it were connected to the power adapter.
Method A and B still do not work.
Results: holding down buttons longer do nothing for me. The device seems to have lost power, but when charged, immediately the device enters the boot loop state.
Note: when doing method A and B the trials were done when screen is on and when screen is off, still no results.
Now the screen is off and not connected to anything. The problem still persists.
Click to expand...
Click to collapse
If I had to guess I would say your volume down is broken, else it would enter hboot
plug in the power and let it charge all day. then plug it to your pc and try to adb reboot bootloader or adb reboot recovery the instant you here the pc usb ingage.
once you get to the bootloader try and fastboot erase cache followed by fastboot reboot
after your phone boots you should be able to go back to bootloader and reinstall custom recovery
clsA said:
If I had to guess I would say your volume down is broken, else it would enter hboot
plug in the power and let it charge all day. then plug it to your pc and try to adb reboot bootloader or adb reboot recovery the instant you here the pc usb ingage.
once you get to the bootloader try and fastboot erase cache followed by fastboot reboot
after your phone boots you should be able to go back to bootloader and reinstall custom recovery
Click to expand...
Click to collapse
I have a few questions/concerns to this.
1. When I charge it, I can't stop the phone from the continuous boot. I'm afraid that doing this all day might hurt the phone more.
2. Currently I have been charging it via computer (still boot loop), and the computer does not recognize it at all. I think there is really not enough time because the loop duration is only a few seconds.
3. Since the phone is connected to the computer, the commands adb reboot bootloader and adb reboot recovery does not work. Error: device not found.
geeibara said:
I have a few questions/concerns to this.
1. When I charge it, I can't stop the phone from the continuous boot. I'm afraid that doing this all day might hurt the phone more.
2. Currently I have been charging it via computer (still boot loop), and the computer does not recognize it at all. I think there is really not enough time because the loop duration is only a few seconds.
3. Since the phone is connected to the computer, the commands adb reboot bootloader and adb reboot recovery does not work. Error: device not found.
Click to expand...
Click to collapse
well have you held the phone under a bright light and held just the power down for 15 seconds and let go when the phone go's off ?
clsA said:
well have you held the phone under a bright light and held just the power down for 15 seconds and let go when the phone go's off ?
Click to expand...
Click to collapse
So what is this method supposed to accomplish?
I did this and the phone stopped the continous boot. However when I tried to go to hboot it went back into the loop. I did this twice, and I'm able to stop the loop with the bright light method, but I don't know what to do from here.
Note: when plugging phone into computer, the loop starts again.
geeibara said:
So what is this method supposed to accomplish?
I did this and the phone stopped the continous boot. However when I tried to go to hboot it went back into the loop. I did this twice, and I'm able to stop the loop with the bright light method, but I don't know what to do from here.
Note: when plugging phone into computer, the loop starts again.
Click to expand...
Click to collapse
will the phone charge when in the off state / not from PC ?
clsA said:
will the phone charge when in the off state / not from PC ?
Click to expand...
Click to collapse
Plugging the phone into the adapter, the phone charges, but the boot loop occurs again.
geeibara said:
Plugging the phone into the adapter, the phone charges, but the boot loop occurs again.
Click to expand...
Click to collapse
the phone should not bootup with the power cord plugged in from an off state (are you turning the phone back on ?)
turn off phone by holding power 15 seconds under a bright light
plug phone into outlet (not PC) let charge till green light comes on (not Red)
hold volume down and power for 10 seconds ( you should be in hboot)
plug phone to PC choose fastboot hit power
your now in fastboot usb
from here you reflash recovery
fastboot erase cache and reboot recovery
if your still in bootloop I'm at a loss, and seems your hboot is corrupted I think you have to return your phone to Verizon or HTC.
clsA said:
the phone should not bootup with the power cord plugged in from an off state (are you turning the phone back on ?)
turn off phone by holding power 15 seconds under a bright light
plug phone into outlet (not PC) let charge till green light comes on (not Red)
hold volume down and power for 10 seconds ( you should be in hboot)
plug phone to PC choose fastboot hit power
your now in fastboot usb
from here you reflash recovery
fastboot erase cache and reboot recovery
if your still in bootloop I'm at a loss, and seems your hboot is corrupted I think you have to return your phone to Verizon or HTC.
Click to expand...
Click to collapse
Well I don't know if it is truly off, I'm just assuming it is.
But yes as soon as I plug the phone into the power adapter the red led flashes on, and the htc logo appears, then the loop continues.
I'll probably take it into Verizon tomorrow and update on what happens.
Update: Welp, I gave up. I'm going to get my replacement soon and I'll be turning it into Verizon. Really it's not that bad of a loss since I just wiped the phone, only thing is I lost my screen protector and carbon skin
geeibara said:
Update: Welp, I gave up. I'm going to get my replacement soon and I'll be turning it into Verizon. Really it's not that bad of a loss since I just wiped the phone, only thing is I lost my screen protector and carbon skin
Click to expand...
Click to collapse
sorry to hear that mate!!!

HELP: Stuck on sony screen after installing ROM

edit: fixed it, just flashed a stock FTF, i'll dot the whole process again later on and hope this time it works out
You can close teh thread (i've tried to delete it but can't find the option)
I've just checked that I can boot my phone and recovery works. But for instance when i try to put service mode it gives an error with IMEI
edit: i've booted to the other recovery (using volume up) and installed the pre-rooted FW again. Shut down and tried again the flashmode process but still no luck, red and quick green light. After booting the phone, it seems to work basically, but wifi not working, it doesn't turn on.
What should the next step be?
The computer does not recognize the phone when my connect it to the USB port, not even charge. The only thing that happens is a flash of red light then green light. Same thing if phone is shut down when i connect the usb cable, red flash, then sony screen appears, then green light, and finally it vibrates two times before showing the level of battery, but without actually charging it.
Anf if i try a Vol Down+Power when in standby and connect with usb cable, it shows a quick red then green flash, and then nothing.
Ok i fixed that problem apparently the USB cable decided to stop working...
Now i have another problem as I decided to install the deodexed ROM and now my phone gets stuck at the sony screen and i can't even boot to recovery.
What i did to install:
Boot to recovery using Volume Up (PhilZ)
Prepare to install new rom (which formats Data, cache, etc)
Install ROM form SDcard1
Everything went fine but at the end it says "root lost or something" I put yes, then rebooted to system, and got stuck on sony screen....
What did i do wrong and how to fix it??
Thanks for the help!

bootloop android logo

I have problem I formatted my phone via recovery and no system found. My phone going to bootloop after power on Every time i power ON the device it gets to the screen that says "Powered by android" device untrusted and keeps rebooting. Many buttons combos not working. only way to turn device off is battery disconnect. Help
mati5000 said:
I have problem I formatted my phone via recovery and no system found. My phone going to bootloop after power on Every time i power ON the device it gets to the screen that says "Powered by android" device untrusted and keeps rebooting. Many buttons combos not working. only way to turn device off is battery disconnect. Help
Click to expand...
Click to collapse
Only you can do is to flash original firware with NOST flasher.
OK i get this software but i cannot get this phone to download mode and phone has only bootloader unlocked not critical. What i can do?
OK i successfully boot my phone to download mode and all fixed. Thread closed

bricked?

I was trying to go back to stock after having Lineage installed but it crapped out during the install. The tablet is now stuck on the SAMSUNG logo screen and it seems impossible to do anything to get around it. The only button combo options that work are power+vol down which reboots and power+vol down +home which puts it into download mode. I've tried reloading the stock firmware and twrp using Odin but it always results in the same, the tablet reboots then goes to the standard android update screen, says it's doing an update and then reboots and it's back to the SAMSUNG screen. Nothing I do gets me into recovery and while Odin connects I can't get ADB etc to.
Any suggestions other than throw it in a drawer and forget about it?
TIA
Ok I got further. I left the tablet for the battery to die, then fully charged it, plugged into the PC and then started with the recovery key combo and bingo got the No Command screen then the standard recovery options. Deleted the cache and did a factory delete/reset and it's alive again.

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