Supports: Android 10, 11 (through GSI’s)
Device-specific ROMS: None at the moment, only GSI’s, due to the fact it is an MTK device.
Device-specific XDA Forums: https://forum.xda-developers.com/redmi-note-9
My own XDA guide: https://forum.xda-developers.com/redmi-note-9/how-to/faq-guides-bootloader-magisk-edxposed-t4176581
I am willing to give all the support I can, whether you need me on Windows 10 or Linux.
I own the device and am willing to experiment on it, as long as it’s not hard bricked and there’s a way to recover it for daily use.