If you came here because of recent issues with the OS update, readme.

[BlackRedDead]

You can revert/rollback to the previous installment following this guide.
But first make sure you have enough battery power or better plug the deck into wall power before following this guide:
https://www.gamesinhand.com/post/rollback-your-steam-os-version
or just the video:
https://youtu.be/AN_-Bn1Elz4
tho this sadly will only work until you shut down the SD, after a restart it will install the now previous (new) update over the now current (old) update.

you can make it permanent with this command in the console(/terminal), tho use at your own risk!

sudo rauc status mark-active booted

https://rauc.readthedocs.io/en/latest/using.html#manually-switch-to-a-different-slot