This is the best summary I could come up with:

Valve has released the latest stable update to SteamOS for Steam Deck, and it includes quite a healthy dose of bug fixes and general improvements.

Fixed black screen when launching Forza Horizon 4 and other titles on Steam Deck OLED.

Fixed an issue where modifying settings in the desktop partition manager could prevent the SD card from being mounted and visible in Steam.

Fixed a WiFi crash occurring where certain bands would cause the driver to attempt to set an incorrect spatial stream count.

Fixed the performance overlay displaying GPU clock speed as an instantaneous measurement rather than an average, resulting in misleading numbers.

Reduced stutters when the upscale filter was set to FSR or NIS under high GPU load.

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