Check below video to flash TWRP within Old TWRP
[youtu.
be/WAXyPXRkCb0
And If you are Mi 10 Ultra user download below TWRP to flash
https://androidfilehost.
com/?fid=17248734326145679757
This dude helped me to install previous build with 21.4.28 but unfortunately with a full format, luckily i did a week go backup with mi account and google account. restore 85 % of my data