Hey there. I posted a similar topic recently, but I decided to repost, because of the fundamentally changed state.
I originally couldn't update from 6.9.2. In my long troubleshooting steps I tried just reinstalling the newest version from scratch, and it gave me the same error: Unraid is detected, starts, but fails to finish booting. It stops working near the end of the normal boot process. I either get a green screen, or a glitching text screen. Unraid is not available on the network. I tried a different USB stick (of the same brand). My USB is the SanDisk Cruzer Fit. I tried installing with UEFI enabled and CSM disabled, as well as with UEFI disabled and CSM enabled, same result. I am still stuck on 6.9.2, and the MyServers Plugin is starting to break, so I really want to update. Thanks for any suggestions.