poco m3 does not turn on anymore

[ANerdyNub]

I also got the deadboot with this update, I am now trying to update to 12.5.7

I discharged the battery as described here on the forum and just got it restarted by booting it up with power button + volume down. It vibrated briefly and the Fastboot logo appeared. Then it got stuck. Then I long pressed the power button and it booted up. After booting up, it showed a battery level of 12%.
The message came that the February security patch was successfully installed.
I now have the following version:
MIUI Global 12.5.5 Stable
Android version 11 RKQ1.201004.002
Android security update 2022-02-01

Is there a way to upgrade to another MIUI version so I can turn it off and on again without any problems?

 

[ANerdyNub]

what worked for me was just waiting for battery to drain and then put on charge and the battery icon appears, after 5 minutes poco logo appeared, after that it went back to battery icon, so I kept pressing volume down and up buttons so it doesn't go black and then when it shows one percent I just hold power button

 

[sarabbafrani]

so if I just hold the power button when phone is on to force poweroff, I can just turn it on normally after?

I was tinking of waiting for battery to go to 0 when the phone is on

Loop-x forgot to quote​

All scenarios are available , depends on capacitor gap in your phone
Best way is fix that i told here
Ask someone mobile technician to remove that little shield for permanent fix to end this problem forever

 

[alecxs]

it's bad hardware design, all these software workarounds are just coincidence

 

[ANerdyNub]

it's bad hardware design, all these software workarounds are just coincidence

So coincidence that it happened after update and never happened before?

 

[alecxs]

So coincidence that it happened after update and never happened before?

yes, exactly. software update itself does not harm anything. it's the reboot itself that made the correlation in time

 

[ANerdyNub]

yes, exactly. software update itself does not harm anything. it's the reboot itself that made the correlation in time

Then why do people say it helps to update firmware?

 

[alecxs]

flashing from MiFlash in EDL mode forces reboot, so it may exit EDL mode (if you're lucky)
I am still on V12.0.9.0.QJFEUXM EEA btw and never did any update. one day in brigudav's TWRP I tapped reboot to system and it happened...

 

[mfoxbr]

I'd like to say thank you for @sarabbafrani for the method that worked great on my mom's Poco M3. I'm a complete newbie on soldering and all, and I adventured myself on doing the shield removing as I didn't quite have trustworthy technicians around my city. My mom's cellphone went from not responding at all on pressing the power button from working great, with (at least as I'm posting this) no sequels at all. I protected all the motherboard (except the shield) with aluminum foil, used the heat blower setted on slow flow (300ºC), one drop of RMA 223 flux on the shield and went very slowly, following the steps on the video posted by @rajlesta, for witch I'd like to say thank you also! You guys are great!

I followed the method suggested by @sarabbafrani and it worked. Thank s bro.
Able to reboot normally now

My steps

 

[sylvio2000]

Hi. I have not read all posts in this thread, but I have one question:
Is the removing of the shield the only possible fix to be able to restart or power on/off this device anymore?
Or is it possible, after draining the battery, to install a custom rom and everything is fine?

 

[sarabbafrani]

Hi. I have not read all posts in this thread, but I have one question:
Is the removing of the shield the only possible fix to be able to restart or power on/off this device anymore?
Or is it possible, after draining the battery, to install a custom rom and everything is fine?

If you want my opinion
Removing is better
Because I've seen some cases with draining battery , call instability and...
Its not dead problem only
Can affect on other parts.

 

[alecxs]

I can report after draining battery for three days and good portion of luck phone finally booted again. But next day my phone switched in Safe mode without reason. So something is wrong for sure. Now I am stuck in Safe mode and can't use most of my apps

 

[sylvio2000]

OK. I already wrote to Xiaomi support. They said if it is not a mechanical error they repair it for free. The phone is 1 year and 3 month old.
The question is: How does Xiaomi repairs the phone? I installed the xiaomi.eu rom. I think they will only set the device to stock rom. I will link xiaomi to this thread. Maybe it helps to understand the problem.

 

[alecxs]

they won't repair it. they don't know how.

 

[sylvio2000]

What do you mean? That Xiaomi installs the stock rom?

 

[Pablo Sub-Zero]

Hi guys, i own an M3, i got deadboot the first time and i had the shield removed by a good technician, after some weeks i got deadboot again when trying to reboot from fastboot mode, when i plug my phone to the computer makes the windows sound that the phone is connected to the computer but the screen is still black, what should i do guys???

 

[alecxs]

Bad. so the "fix" isn't as permanent as it seems...

you could try this

I don't think software update can fix that. EDL is booted straight from PBL it does not even pass SBL or XBL

so I let drain battery by holding vol down + power with hair tie for three days. it left EDL mode when battery died, and low battery icon is displayed.

From this state I somehow managed to enter fastboot mode by only holding vol down with hair tie + connecting usb to PC (low charging 500mA)

once in fastboot mode I installed android_winusb.inf and booted from fastboot.exe

fastboot continue

Now I won't update or reboot ever and keep battery charged between 20% - 80%

 

[sarabbafrani]

Hi guys, i own an M3, i got deadboot the first time and i had the shield removed by a good technician, after some weeks i got deadboot again when trying to reboot from fastboot mode, when i plug my phone to the computer makes the windows sound that the phone is connected to the computer but the screen is still black, what should i do guys???

Disassemble it take photo from motherboard and send me
To check you technician work
Measure charging amp
Connect to pc if Qualcomm 9008 detected feedback me

 

[wasThere]

The question is: How does Xiaomi repairs the phone?

I think they put a new motherboard in it. People having the repair done say the IMEI has changed.

 

[Burn2Hell]

They will change phone I think

The phone is back, they have swapped/replaced the motherboard (new IMEI number). It came with 12.0.9.0 I've updated it straight away to 12.5.7.0 and now I hope for the best that it keeps working.