Is there any way to find the solution when Beta Updates are not getting installed on the SteamMachine? Since the July 29 Beta Update the updates are not able to install anymore. They are always popping up again after the restart and the OS Version stays the same.

Stable channel is working as expected. But when getting back to Beta the System is not installing the newest version. I like the Raytracing and VRAM improvements so I will stick with Beta until those tweaks ars available at the Stable Branch.

Is there any way to maybe clean some Beta Update cache etc?

Where do I find Change Logs for the Steam Controller?