SteamOS 3.4.11 has been released to the Stable channel for Deck with the following changes:
Firmware 116
- Improved robustness of the Firmware Settings Reset chord (Volume Down + Quick-Access + Power) against some boot hang scenarios.
- Fixed a rare issue that would set the processor TDP limit too low causing CPU and GPU frequencies to be stuck at 400 MHz and 200 MHz respectively.
- Fixed an issue when the charging light would turn back on when plugged in for a while after fully charged.
SteamOS
- Fixed an issue where power button presses could switch games to keyboard/mouse mode.
So you mean that people that are on 3.5 preview will also receive the firmware update because it isn't already in the 3.5?
The beta also had a firmware update included. Don't know if it was the very same or an earlier version.