What to do if the phone turned off and does not turn on after an unsuccessful firmware?

Question

Mobile devices

My friend had an unsuccessful firmware, what should he do if the phone does not respond to any actions?

Phone: Xiaomi Redmi Note 5A
Background:
My friend wanted to upgrade to Android 9, he unlocked the bootloader and entered FastBoot mode After downloading the
utilities, he entered into the console:

C:\Users\anton\Downloads\redmi note 5a\tools>fastboot devices
22b4541f        fastboot

C:\Users\anton\Downloads\redmi note 5a\tools>fastboot erase recovery
erasing 'recovery'...
OKAY [  0.014s]
finished. total time: 0.015s

C:\Users\anton\Downloads\redmi note 5a\tools>fastboot flash recovery recovery.img
target reported max download size of 535822336 bytes
sending 'recovery' (34528 KB)...
OKAY [  1.103s]
writing 'recovery'...
OKAY [  1.798s]
finished. total time: 2.904s

C:\Users\anton\Downloads\redmi note 5a\tools>fastboot.exe boot recovery.img
downloading 'boot.img'...
OKAY [  1.115s]
booting...
FAILED (remote: dtb not found)
finished. total time: 1.647s

C:\Users\anton\Downloads\redmi note 5a\tools>fastboot.exe boot boot.img
downloading 'boot.img'...
OKAY [  1.097s]
booting...
FAILED (status read failed (Too many links))
finished. total time: 1.184s

And after executing the last command, the phone turned off and no longer responds to the power buttons and does not enter fastboot, what should it do?

Answer 1

maybe this?