OS Tried:
Windows 10 Pro
Arch Linux (with usb udev rules)

What Happened?
Plugged in my Redmi note 9 with unlocked bootloader, usb debugging enabled with security features disabled.
Flashing went well, firmware was flashed, then it was stuck on "ADB is waiting for devices" and the device bootlooped for some reason.

What can cause the problem?
mostly incorrect image flashed, because when i flashed Engineering ROM for merlin, it did boot, but when I flashed some other custom rom, it didn't(I used the one for merlinx but both are the same). I couldn't get it working and got it hard bricked and restored it using BROM mode.

NOTE
Custom recoveries such as LineageOS recovery, UBports recovery didn't go well, it never went to recovery screen despite me holding the hotkeys
but the TWRP for Redmi 10X went well, it worked, but it was temporary flash, (I just booted from it)

What did I not try to do
I didn't try to flash manually using twrp, but I flashed manually using fastboot by first erasing the partitions then flashing via fastboot mode

What happened next
It still was in a bootloop, lost IMEI due to flashing Engineering rom using sp flash tool but successfully restored using MAUImeta, but now stuck on engineering rom.
Xiaomi never provided a working image of its stock rom via its website, its servers are painfully slow and made me wait 3 days but it didn't work

What help do I need?
I need to somehow flash a working UT image and make it work

@MrT10001 It doesn't work right now.

@MrT10001 I can enter fastboot and flash images, but the images flashed from fb don't work. flashing via recovery mode (and only eng. rom) works.

@Vlad-Nirky I also hope it. I hope he will find a solution to help me out.

Rewriting doesn't work.
It is now bricked except for engineering rom which is unusable except for testing purposes

This doesn't work. it causes infinite bootloop part of the reason why is nv data is corrupted. Can rewriting nvdata with mauimeta fix it?. I'll try it.

@MrT10001 are they mediatek phones. If yes then this will help you (beware that this works on only old xiaomi mediatek devices)

@MrT10001 Afaik, both are same, since twrp of 10x 4g works on note 9, codenames are same (merlin).
@Vlad-Nirky I will try the rom you gave tmrw mrng (its 12:00 AM here)
Thanks for the response.
I'm downloading this

@MrT10001 Yep, it is an indian variant.
What can be my chances of saving it now?
Any help?
i found this on the web

@MrT10001 I am sure.
Take a look
.

@MrT10001 I Downloaded this Since My Device Is India (NOT NFC) and I even tried the Global 12.5.4 ROM both didn't work.