Bricked and doesn't turn on - OnePlus 6T Questions & Answers

So here is the sad story , was just receiving the message in viber and the phone suddenly died, tried many methods
Tried to load into recovery
Tried MSMdownloadtool
when i hold volume +and - button and power button and plug it into the PC the MSMdownload tool recognize the device and when i follow the procedure it gives message like Firehose data read error.

That's "easy" to fix, first use the original USB cable (I don't know why, but on my device the flash always fails when I use a non-original cable), try with another USB port of your pc, or try with some other Qualcomm driver.

onliner said:
That's "easy" to fix, first use the original USB cable (I don't know why, but on my device the flash always fails when I use a non-original cable), try with another USB port of your pc, or try with some other Qualcomm driver.
Click to expand...
Click to collapse
yup, Tried original USB, different port and different laptop still stuck on those error

same problem tried multiple times no luck

Related

Problem with usb connection

Hi guys ,my problem is that when I connect my phone via USB cable at first there is no problem, data transfer , windows mobile device center, everything is OK. But when I want to flash the phone pressing vol-down + switch on/off keys the phone is not connected to the PC. And I can't flash it. Also the phone wouldn't like charge trough the charger ,only with the data cable. Is it possible to have any liaison between the problem with charging with charger and no-connection when try to flash.
Also my phone was to the service for touch-screen change ,is it possible the technician make any mistake ? Cause I think that if he make a mistake with the connector nothing gonna work ,but it works at different situations.
Regards!
check to be sure USB SYNC driver installed correctly and also try a different usb cable.
I'll try but there is no logic ,the cable works when charge the phone, works when is connected to device manager but doesn't works when flashing ?
exactly. the device requires different drivers.
1. there is internet sharing and disk mode (which works with all computers, because those drivers are in the operating system)
2. then there is one driver for syncing
3. and another one for flashing
it is not the same kind of data transfer, which is why you need a different driver. but the thread "[tut] updating htc sync drivers" should cover all your windows vista/7 driver needs and a tutorial on how to install them, which in case of a x64 system can be fairly complicated.
if you already have hspl installed (which you can determine by entering bootloader mode and looking whether it says 1.56Olinex), you can also flash using the sd car method. put a rom of your choice on the sd card, name in BLACIMG.nbh and enter bootloader mode, you will be presented with options to flash the rom.
Ok, but in instructions at the thread you give me is written that I have to start making the steps after I see "USB" on the flashing screen. But I don't see it, it's only "Serial". And now what ? I know that if on the screen i written "USB" the phone and the computer are connected and there is no problem to flash ,but now what ?
well, before you start, put your device into bootloader mode. it will show "serial", then connect it to the pc. test your connection using mtty 1.42 (you'll find several download options here in the forum).
the connection settings for mtty are USB 115200-8-1-No-NONE-None
if it works, connect and press enter, the command shell should show USB> then.
if usb is not present in the connection settings, your connection is not established yet. proceed with the tutorial then. during the entire procedure, the device should remain connected to the pc in bootloader mode, so you install the driver for the right device state.
Hello,
I've problem something like this. Few months ago when i was conecting my phone to computer was everything OK, activesync, disk drive, but now nothing, just charging the phone. I've tryed everything in USB to pc zone, but nothing. When i'm going to bootloader it's writen serial. What can be here?
since you already tried all the different connection methods and even bootloader mode does not connect, there are hardly any options left, where the trouble could be:
- the usb port on the blackstone
- the usb port on the pc
- the cable
you can try another port on the pc (or even better, another pc altogether) and/or another cable, like from a digital camera, an external hdd... (many devices have mini usb cables, you should be able to use either one of those)

Can't connect my viewpad 10s...unknown device problem

Ok...here is my story. I have a really big problem. I have the 10s(same is the advent vega) for about 3 weeks and i couldn't manage to connect it to my computer. I bought a male to male usb cable and when i plug in the tab and do the 2 sec back, 2 sec power thing my computer sees the tab as a unknown device. I tryed all the usb ports on my computer and nothing. I have xp but i tried on two other computers with win 7 and the same thing. I tried to update the driver from device manager ...tried to uninstall and search for new device and the same thing. I tried everything.... read all tutorials tried every usb driver... I ''broke '' my tablet and it won't boot now ...the backlight just starts and it turns off.So I need to connect my tab now badly.... so if someone could help....
Once more.....things i tried:
every usb port on comp
diffrent windows and computers
usb driver update
audi
vega tools
10000000 times to get in to the recovery mode (hoping that the comp would show the apx device)
I didn't get a usb cable with my device so i had to buy one..i found a male to male cable
So if anyone knows a way to help me with my unknown device problem... please do... i'm really sad that my tab is ''dead'' have it for a couple of weeks...
Do you have the device USB drivers?
I can send you the drivers and you can try to see if it works with your device , Not sure if it will fix the problem but you can try.
PM me your email and I will send you the file
same problem here, onluy "Unknown device".
Have the right drivers and tried to manuell select the drivers, but it won't work, see screenshot
I had the same issue, BUY ANOTHER CABLE, IF POSSIBLE DIFFERENT BRAND.
That solved my issue, believe it or not the cable was broken. This will work in case you have all the drivers and entered into recovery mode correctly.
Give it a try.
Hi!
I used to have the same problem with my Viewpad 10s whenever I came from stock version. What I found out was that the driver for advent vega must be a bit different from viewsonics.
Try to use the ones on viewsonics site and then try to flash...
...if not maybe its really a cable problem!
Cheers

[Q] Galaxy S5 CANT FIND USB

Im in England and the phone for S5 for America, how do you find the USB "connection as camera" its not in the notification panel ? im trying to get on Kies, but i cant.
ron101 said:
Im in England and the phone for S5 for America, how do you find the USB "connection as camera" its not in the notification panel ? im trying to get on Kies, but i cant.
Click to expand...
Click to collapse
Do you have the usb drivers installed correctly? Or try another usb port/ cable.
IVE put the USB driver in the c drive along sid the KIES and still it says its (USB) not recognised. Is there something else i could use instead ,i didnt like kies anyway.I tried to get airdroid to work (ive had that for 3 years) but it doesnt handle software (my phone) 4.4.2 it only does 4.3. It says FORBIDEN.FAILED TO SEND MESSAGE on my PC.
Most likely you are using an outdated version of Kies. There are multiple versions of Kies, ensure that you install the latest version of Kies. Then open Kies and have it detect your phone. That is by far the easiest way to install the proper driver for your S5 model. After the driver is in place you can close Kies and never use it again. Or uninstall it if you wish.
Do not use an USB hub, connect directly to your phone. If you have ongoing issues, use a different USB cable and port. Ensure that you are using a data cable, not a charging (only) cable that has the data lines shorted. If your PC has USB driver issues in general, then you'll need to resolve those issues first or use a different PC.
.
fffft said:
Most likely you are using an outdated version of Kies. There are multiple versions of Kies, ensure that you install the latest version of Kies. Then open Kies and have it detect your phone. That is by far the easiest way to install the proper driver for your S5 model. After the driver is in place you can close Kies and never use it again. Or uninstall it if you wish.
Do not use an USB hub, connect directly to your phone. If you have ongoing issues, use a different USB cable and port. Ensure that you are using a data cable, not a charging (only) cable that has the data lines shorted. If your PC has USB driver issues in general, then you'll need to resolve those issues first or use a different PC.
.
Click to expand...
Click to collapse
KIES V3. The trouble is i cant find the USB i now it should be there in the notif panel but it is not, ive got developer options & usb debugging ticked but thats all, have i got to do anything else (hair pulling time) i dont think so?
1) Should i plug it in the mains or usb on the pc
2) Im using the cable that came with the S5 is that good enough.
3) The S5 sits on a cradle shall i take it of.
4) How do i tell data cable, not a charging (only) cable that has the data lines shorted
5) Ive tried 4 different USB software and it gives the message DEVICE DRIVER SOFTWARE WAS NOT SUCCESSFULLY INSTALLED every time
6) Ive done a reboot every time the drivers are put it
ron
ron101 said:
KIES V3. The trouble is i cant find the USB i now it should be there in the notif panel but it is not, ive got developer options & usb debugging ticked but thats all, have i got to do anything else (hair pulling time) i dont think so?
1) Should i plug it in the mains or usb on the pc
2) Im using the cable that came with the S5 is that good enough.
3) The S5 sits on a cradle shall i take it of.
4) How do i tell data cable, not a charging (only) cable that has the data lines shorted
5) Ive tried 4 different USB software and it gives the message DEVICE DRIVER SOFTWARE WAS NOT SUCCESSFULLY INSTALLED every time
6) Ive done a reboot every time the drivers are put it
ron
Click to expand...
Click to collapse
If you use Windows 8(.1) you have to disable driver signature verification to get the usb drivers installed. Here is a tut. https://learn.sparkfun.com/tutorial...abling-signed-driver-enforcement-on-windows-8.
gee2012 said:
If you use Windows 8(.1) you have to disable driver signature verification to get the usb drivers installed. Here is a tut. https://learn.sparkfun.com/tutorial...abling-signed-driver-enforcement-on-windows-8.
Click to expand...
Click to collapse
Noooop its not that i have win 7 pro
ron
You are juggling too many unnecessary variables. Try to simply that and don't skip checking any of the points.
I have no idea what you mean by plug it in the mains? And at least until you solve this you should not be using a cradle, hub or anything else. As I suggested earlier, connect the phone directly to your computer USB hub. And if you have ongoing problems, try a different cable, USB port or even PC.
Making an assumption that the cable that came with the phone is good enough is counter productive. It's not impossible that it may be damaged or have some problem. Borrow or buy another cable, to eliminate one more possible cause of your issue.
Retrace and double check each step. As soon as you make an assumption that it's not worth checking x step because it couldn't possibly be the cause, you are skipping a possible solution. Make sure that you are using the latest Odin, make sure that you installed it from windows administrator mode, connect directly to the PC's USB port, different cable, etc. If you are methodical, you'll resolve the problem.
Good luck
.
Have you activated developer oprions and usb debug?
ron101 said:
IVE put the USB driver in the c drive along sid the KIES and still it says its (USB) not recognised. Is there something else i could use instead ,i didnt like kies anyway.I tried to get airdroid to work (ive had that for 3 years) but it doesnt handle software (my phone) 4.4.2 it only does 4.3. It says FORBIDEN.FAILED TO SEND MESSAGE on my PC.
Click to expand...
Click to collapse
If you haven't given AirDroid permissions to send SMS directly, "FORBIDEN.FAILED TO SEND MESSAGE" might appear. Change the permissions in phone's settings for a try
fffft said:
You are juggling too many unnecessary variables. Try to simply that and don't skip checking any of the points.
I have no idea what you mean by plug it in the mains? And at least until you solve this you should not be using a cradle, hub or anything else. As I suggested earlier, connect the phone directly to your computer USB hub. And if you have ongoing problems, try a different cable, USB port or even PC.
Making an assumption that the cable that came with the phone is good enough is counter productive. It's not impossible that it may be damaged or have some problem. Borrow or buy another cable, to eliminate one more possible cause of your issue.
Retrace and double check each step. As soon as you make an assumption that it's not worth checking x step because it couldn't possibly be the cause, you are skipping a possible solution. Make sure that you are using the latest Odin, make sure that you installed it from windows administrator mode, connect directly to the PC's USB port, different cable, etc. If you are methodical, you'll resolve the problem.
Good luck
.
Click to expand...
Click to collapse
AFTER last nite i started again this morning (im disabled completely down the right side of my body) with a new spirit fffft i got stuck in.So here we go first i put the USB cable in another usb port (one that i havent used) and the phone came alive and that was that it was done.So i tried another usb cable,that also came alive, so that was that it was the usb port that i was using wasnt suitable simple as that. Thank you for all of your help fffft and the rest it was essential for me THANK YOU.

Bricked Jiayu S3 Advanced help!

Yesterday i flashed my Jiayu S3 to lolipop (i tought) and i just bricked my phone!
After reboot it was just dead.. when i plug into pc with USB i hear the connect sound and after 2 seconds the disconnect sound. This keeps on going until i pull the USB plug. When i look in DeviceManager i see it refresh after every sound, but nothing pops up (unknown device or whatever). I deletet all usb drivers with usbdeview, restart pc but still no changes.
I tried with or without battery, but without it does nothing at all.. i tried holding Vol+ or - or both or with power button, but nothing.
Read some threads about unbrick and install correct usb driver for jiayu s3, but all the options they came with does not work on my device!
I'm a little despered now and don't know what to do.. i get the feeling that my 2 weeks old phone is dead? :'(
My pc has windows 7
Did the flash with SP Flashtool 5.1516
Did not untick preload in flashtool, i guess i got the wrong preload or something??
Please help!
No one..? :crying:
Lowrida said:
Yesterday i flashed my Jiayu S3 to lolipop (i tought) and i just bricked my phone!
After reboot it was just dead.. when i plug into pc with USB i hear the connect sound and after 2 seconds the disconnect sound. This keeps on going until i pull the USB plug. When i look in DeviceManager i see it refresh after every sound, but nothing pops up (unknown device or whatever). I deletet all usb drivers with usbdeview, restart pc but still no changes.
I tried with or without battery, but without it does nothing at all.. i tried holding Vol+ or - or both or with power button, but nothing.
Read some threads about unbrick and install correct usb driver for jiayu s3, but all the options they came with does not work on my device!
I'm a little despered now and don't know what to do.. i get the feeling that my 2 weeks old phone is dead? :'(
My pc has windows 7
Did the flash with SP Flashtool 5.1516
Did not untick preload in flashtool, i guess i got the wrong preload or something??
Please help!
Click to expand...
Click to collapse
so you cannot boot into recovery or fastboot either?
Lowrida said:
Yesterday i flashed my Jiayu S3 to lolipop (i tought) and i just bricked my phone!
After reboot it was just dead.. when i plug into pc with USB i hear the connect sound and after 2 seconds the disconnect sound. This keeps on going until i pull the USB plug. When i look in DeviceManager i see it refresh after every sound, but nothing pops up (unknown device or whatever). I deletet all usb drivers with usbdeview, restart pc but still no changes.
I tried with or without battery, but without it does nothing at all.. i tried holding Vol+ or - or both or with power button, but nothing.
Read some threads about unbrick and install correct usb driver for jiayu s3, but all the options they came with does not work on my device!
I'm a little despered now and don't know what to do.. i get the feeling that my 2 weeks old phone is dead? :'(
My pc has windows 7
Did the flash with SP Flashtool 5.1516
Did not untick preload in flashtool, i guess i got the wrong preload or something??
Please help!
Click to expand...
Click to collapse
Just flash it again, but this time with "Firmware upgrade " in SP Flashtool instead of "Download". Change from KK to LL needs reepartitioning, so firmware upgrade.
The reason why you don´t "see" the S3 any longer on the pc is, that the USB storage mode from KK, which is driverless for windows, don´t work right now on LL.
Once flashed to LL you will need to install a driver, for windows to connect to the S3.
@ Dior DNA:
No i can't. Phone does nothing with the buttons. Only diference if i hold Vol - then time from connect sound and disconnect sound is a little longer.. about 10 seconds. But still nothing happens.
@1testi:
Flashtools can't see my phone. I tried it a hundred times. With battery, without battery, with Vol - and with Vol +.
When i connect the USB cable i hear the connect sound and after 2 a 3 seconds i hear disconnect sound. This goes on and on until i pull the USB cable out. In devicemanager i see a refresh going on, but nothing pops up.
I'm realy despered on what to do now?
Lowrida said:
@1testi:
Flashtools can't see my phone. I tried it a hundred times. With battery, without battery, with Vol - and with Vol +.
When i connect the USB cable i hear the connect sound and after 2 a 3 seconds i hear disconnect sound. This goes on and on until i pull the USB cable out. In devicemanager i see a refresh going on, but nothing pops up.
I'm realy despered on what to do now?
Click to expand...
Click to collapse
Why the SP Flashtool isn´t working any longer? You didn´t deinstalled the driver, did you? Just try to flash again with "Firmware Upgrade".
I don´t know a way to reinstall the driver in windows without the preloader. The only thing you can do, as far as i know, is to use a linux
pc to flash again. Linux don´t need a driver for SPF, only some rules.
Lowrida said:
@ Dior DNA:
No i can't. Phone does nothing with the buttons. Only diference if i hold Vol - then time from connect sound and disconnect sound is a little longer.. about 10 seconds. But still nothing happens.
(
Click to expand...
Click to collapse
Booting into recovery or flashtool I meant regardless of pc and/or spflashtool.
If I recall correctly:
hold volup and power boots recovery
hold voldn and power boots flashtool
If you can boot recovery then which one is it? Maybe you can restore something or manually flash preloader bin from there.
After the flash i reboot and then the connect and disconnect sound appears. So i tried differend things, but could not connect. I wanted to flash again, but flashtool did not reconice the phone and nothing in DeviceManager. That's why i thought to remove the driver and try to re-install it. But that did not help..
Holding Vol - or + button with power button or both Vol buttons with power button does nothing.. i tried to hold all combinations at least 30 seconds, but nothing at all.
I have no Linux pc or any knowhow to make a Linux pc.. or a pc to install Linux on..
One last thing you can try: remove the battery, wait a little, insert the battery again. Hold vol+ key, keep holding it and press power
button, while still holding the vol+. If you don´t see anything happening then you bricked the phone.
You will need help from a professional or at least from someone with a linux machine, sorry.
I'll try that.
You have any idea what could have caused the brick?
As i wrote above, moving from KK to LL with wrong parameter "Download" in SPF.
....and a not working recovery.
You should try this method :
darmowyinternet.net/forum/temat-poradnik-jak-uruchomic-uceglony-telefon-po-wgraniu-zlego-romu-test-point_383
unfortunately you have to translate before
Ok i tried that site with google translate and i could a little make up what they are saying.
But that is a very drastically operation, and i would like to give it some other tries before dismantling my phone.
So i googled and googled.. came here: http://forum.xda-developers.com/showthread.php?t=889128
Had enough electronics lying around from my former 27mc hobby, so searched for the right resistors,
cut up a micro usb cable and give it a try... well.. nothing! Tried for about an hour and gave up.
Then i googled on Unbrick Jigs, but for what i read they are only for Samsung phones, so i gues the trick
with the resistors were also?
So googling again... came here: http://forum.xda-developers.com/showthread.php?t=2454004
Reading the tread and the comments, someone mentioned a download for "Mediatek Driver Auto Installer".
Downloaded that and installed the drivers. Plugged in my phone and... whoohoo!! Something is happening! :silly:
My devicemanager saw an "Alcatel single RNDIS interface". I unplugged and plugged my phone a few times to
be sure it was my phone. Sooo... one step further! :good:
Then i googled on this device.. came up with all sorts of network devices, not helpfull. Then googled on Jiayu with
this device. Came up with this tread: https://www.china-devices.com/topic...vcomm-drivers-onto-your-pc-win-7vistaxp-only/
It's a tread about bricked Jiayu G3 devices, but i thought, 'What the heck, lets give it a try!'.
I downloaded the "MTK Megapack - All Tools Here!" and unpacked. Wend back to device manager and manually updated the driver
of the Alcatel device. Show all devices - browse - wend to Megapack map and there were MTK drivers for the 65xx device.
And yess.. when i plug in my phone there's the device: " MTK USB Port (COM7) "
SP Flashtools sees my phone again! :good:
Tried to flash a stock preloader, but got an error: "BROM ERROR : S_FT_ENABLE_DRAM_FAIL (4032) – [EMI] Enable DRAM failed!"
But for now that's a problem for tomorrow.. it's almost 2:30 and i have to got some sleep!
(sorry for the misspellings or telling things not clear, i'm tired and english is not my main language)
Grats!
You can google the error. This leds you in the right direction.
It's alive!!!!!! :laugh::silly::victory:
Because the kitkat stockrom i downloaded gave me the same error over and over i searched for something else.
So i downloaded TF Extreme lolipop 5.1 this morning and give it a try. And all went well. I pulled the usb plug and
pushed power button.. only vibration but nothing. Then pulled the battery and after few seconds put it back in
and try power again. Only 1 vibration.. then tried Vol + and - combinations but nothing. (dammn!)
Then plug the usb in and i saw the battery icon.. it was total empty! (because of a week trying).
So now it's charging and i hope it starts, can't wait!!
Thanx all for the effort in helping me out! :good:
Edit: Ok, so i could not wait and hit power! It shows green screen with Jiayu S3 logo and text "New Load". So i guess it's prepairing for first startup!
my s3 basic is not charging when on.. also when connected to pc thru usb, ipc shows device malfunctioning ,and there is no indication on phone..I try to connect to sp flash tool also no success..same error"usb device not recognized pops up every 2s.everything else is fine..Any method to upgrade to 5.1 now on official kk
Kinda need help, happened something similar
It happened something similar to me.
I flashed the whole ROM, bootloader included, I was very sure that my model, Jiayu S3 3GB ROM + 32GB RAM, was the correct, but still bricked my phone.
There's no problem at all when I plug it into my PC, I installed the lastest MTK drivers on windows 10, having to disable the signature enforcement.
The problem comes when I start flashing. I only mark the bootloader, then I press "Download" (on the lastest version of SP Flash Tools), and plug the phone, with the battery in it (I've tried without battery, pressing all possible combinations and does nothing), when I plug it in with the battery and pressing no buttons, the driver is detected as MTK USB Port. That's a good thing I guess. But It does not pass from the red bar, and gives me the known error "Enable DRAM Failed".
I've tried to google any possible solutions, reinstalling other version of the MTK drivers, on different versions of Windows, with other versions of official ROMs, and the result is always the same.
The only thing that's left to try is flashing it with an Ubuntu machine, which is something I do not expertise to be honest, but I'm gonna gather some info and try to do it.
However, if someone has any idea of what I might be doing wrong (excluding the part when I flashed the bootloader, I'll never do it again), I would be really grateful for any kind of help.
Thank you!
Kiei said:
It happened something similar to me.
I flashed the whole ROM, bootloader included, I was very sure that my model, Jiayu S3 3GB ROM + 32GB RAM, was the correct, but still bricked my phone.
There's no problem at all when I plug it into my PC, I installed the lastest MTK drivers on windows 10, having to disable the signature enforcement.
The problem comes when I start flashing. I only mark the bootloader, then I press "Download" (on the lastest version of SP Flash Tools), and plug the phone, with the battery in it (I've tried without battery, pressing all possible combinations and does nothing), when I plug it in with the battery and pressing no buttons, the driver is detected as MTK USB Port. That's a good thing I guess. But It does not pass from the red bar, and gives me the known error "Enable DRAM Failed".
I've tried to google any possible solutions, reinstalling other version of the MTK drivers, on different versions of Windows, with other versions of official ROMs, and the result is always the same.
The only thing that's left to try is flashing it with an Ubuntu machine, which is something I do not expertise to be honest, but I'm gonna gather some info and try to do it.
However, if someone has any idea of what I might be doing wrong (excluding the part when I flashed the bootloader, I'll never do it again), I would be really grateful for any kind of help.
Thank you!
Click to expand...
Click to collapse
Oeps it might be the same problem with the 32GB version as I have.
See http://forum.xda-developers.com/showpost.php?p=68036678&postcount=295
I am waiting for a stock ROM backup.
I have learned to never flash the original preloader again.
xtyphoon said:
Oeps it might be the same problem with the 32GB version as I have.
See http://forum.xda-developers.com/showpost.php?p=68036678&postcount=295
I am waiting for a stock ROM backup.
I have learned to never flash the original preloader again.
Click to expand...
Click to collapse
You're right, with the 32GB rom version (which is still unavaliable for public use) it worked! I still got it here, so anyone feel free to ask me the link too.
Thanks to xtyphoon and Dior DNA and everyone who made this possible, if you ever come to Girona city, I'll buy you a drink ;D
Kiei said:
[...]if you ever come to Girona city[...]
Click to expand...
Click to collapse
I was around there few weeks ago

My (bricked) Xiaomi MI A1 won't connect to pc

Almost a month ago, my phone ran out of battery so I charged it. When I got back, there was a warning sign and below it said: "the system has been destroyed"
I tried everything I could to flash it, included the official Xiaomi flash tool, but the problem isn't the method itself, but the phone, which it's not being recognized by my pc at all.
When I connect it (In fastboot mode), a notification shows up saying: "The USB device is not recognized", I tried commands, updating the drives, cleaning up the USB port, another USB cable, but nothing worked.
Does anyone know any possible solution for this? Thanks in advance : D
faulty usb cable may be the reason and try edl mode
MrHarveen said:
faulty usb cable may be the reason and try edl mode
Click to expand...
Click to collapse
I have already tried with other cables (and all of them are working for everything except this, so it's the device's fault), and edl mode can only be activated with a computer, so i guess i'll keep trying
Drivers must have been installed multiple times.Delete them and reinstall.
Cheers.
Same problem bro
Hi!
There is a way to enable EDL mode without computer but you'll have to open your phone.
Once opened, you must short two specific test points while connecting USB.
That's how I got out of a bootloop with a locked bootloader.
For the procedure just search for "edl test point mi a1", there are many videos.

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