Mi 9T bootloop with locked bootloader - Redmi K20 / Xiaomi Mi 9T Questions & Answers

Hello all, I recently got this Mi 9T that is apparently stuck on bootloop with a locked bootloader.
Both the recovery mode (stock) and the fastboot mode are accessible.
I tried to wipe from the stock recovery, but I got nothing. Still stuck in bootloop.
I then tried using the XiaoMiTool V2 by Francesco Tescari to reflash the latest official ROM from Recovery, the program said installation succesfull, but the same problem happen.
Sometimes it menage to boot in a black screen with the lower buttons (back, home, recent apps) but stays here for maximum 1-2 seconds then it restarts.
Any suggestion on hot to repair the decive would be much appreciated.
Thanks!

Fastboot and mi flash tool

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my Redmi 3S is bricked?

I unlocked the BL and flashed an International Developer MIUI two years ago, and it has been working fine.
I want to flash a stable ROM now. the miui website gives three approaches (system update, recovery update, fastboot update).
I first tried system update, but the system cannot proceed.
then for recovery update, volume up + power button enters Teamwin (TWRP), not the recovery interface shown in the official guide.
then fastboot update, unfortunately the MIFlash tool does not recognize the phone in fastboot mode.
so I went back to TWRP, clicked Install, and installed this ROM: http://bigota.d.miui.com/V9.2.1.0.MALCNEK/miui_HM3S_V9.2.1.0.MALCNEK_fe706c31c4_6.0.zip
which I saved to the phone storage earlier.
now the phone is in a bootloop , stuck at "mi" boot screen. somehow I can still enter fastboot mode, but I don't know what I can do to save it.
please help me , thanks
Trying to make guide for that
I just resently came out from hard bricked
https://m.facebook.com/groups/14118...link&id=1794691427491837&refid=18&__tn__=*W-R

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Hello,
I unlocked boot loader few days ago and then flashed TWRP 3.0.3 for my device.
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No physical buttons are working. No hard restart, no boot loader nothing.
Please help.
This subforum is for markw btw.
If no hw buttons work, you may try test point method to reset/reflash. Better search on MIUI Forum for details.

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Hello everyone,
I have a problem with my mi a1, it's stuck in the logo (android / mi logo)
When I try to flash the fastboot method, it flashes "Flash modem_a error"
I can only flash through EDL points, but after the phone is finished and when it restarts, it gets stuck on the same screen.
I tried to install twrp recovery, but it gets stuck on twrp home screen (Teamwin logo)
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I tried to add photos from the screens, but as I am a new user and not allowed, sorry

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Downgrade to Oreo via mi flash tool , i think it might fix it.

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