https://us.community.samsung.com/t5/Discussions/Stable-release-rolling-out-for-S21/m-p/2434431/highlight/true
Stable release rolling out for S21 - Samsung Community - 2434431
Nov 11, 2022 - https://www.sammobile.com/news/public-galaxy-s21-android-13-and-one-ui-5-0-update-is-out/ - 2434431
stable releaserolling outsamsung community