New - Memory extension feature (Redmi K30 5G/Redmi K30i 5G/Redmi K30 5G Speed)
Optimization - Unlocked Xiaomi's refresh rate limits for international apps like YouTube

New - Unlocked "Performance mode" in Battery settings for supported devices
New - Unlocked "Optimized charging" for supported devices
Fix - Couldn't update virus definitions if Avast definitions are set

Fix - App was crashing while updating Tencent definitions or trying to start a scan if Tencent definitions are set

WARNING: Camera doesn't work properly on Mi 10T Pro. We don't recommend upgrading to this version if you own Mi 10T Pro. Redmi K30S Ultra/Mi 10T camera works fine.
This changelog doesn't mention all changes made by or Xiaomi.