Xiaomi 13 ultra bootloop

[vasastan]

Hello everyone,
I recently updated my Xiaomi 13 Ultra using fastboot mode. Since then, it's entered a reboot loop. As soon as it turns on, it briefly displays the TWRP home screen, then the screen goes black, and then it displays the TWRP home screen again, then the screen goes black again, and so on without stopping. I can't turn it off, I can't reboot it in recovery mode. I can only put it in fastboot mode. I tried completely flashing the smartphone by formatting it and reinstalling the system, but it's still stuck in its reboot loop. Can anyone help me, give me a procedure, or a tutorial to fix this problem?
Thanks in advance for your answers.

 

[vasastan]

Nobody can help me ?

 

[vasastan]

So, thank you for your many replies. I deduce that there is no solution and that my Xiaomi 13 Ultra is not repairable and that I will have to buy a new one.

 

[medmed58]

Put the phone in FASTBOOT mode
Even if it bootloops, I do the following:

I hold down the buttons : Volume Down + Power for 15 to 20 seconds, until the text FASTBOOT appears on the black screen.
Check the connection from my PC
In a terminal (PowerShell, CMD or Linux/macOS terminal) : fastboot devices
I need to see a line with an identifier (e.g. c1235684 fastboot). If not, there's a driver or cable problem.
Check the active slot
I type : fastboot getvar current-slot
Possible answer : current-slot: a
or : current-slot: b
Flash the correct TWRP.img in the correct location.
Example: I'm in location b, so I flash boot_b:
fastboot --set-active=b
fastboot flash boot_b twrp.img