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For the record . . . . I added the same quirk to 32-bit Raspberry Pi OS, 64-bit Ubuntu 20.10 (Pi 4 image), and 64-bit Ubuntu-mate 20.10 (Pi 4 image), and all three properly disabled UAS and downgraded to usb-storage which allowed the internal DeskPi Pro SSD to work OK.

Yes, the instructions I refer to are a little arcane and may not be specific to your situation. I interpolated the instructions and performed the fix in a different manner. While Ubuntu-mate 64-bit is an official Raspberry Pi 4 Debian-based Linux distribution, it is structured a little...

I have successfully reconfigured the DeskPi Pro with an SSD to work fairly well. As noted, the issue is with the internal USB 3 to SATA adapter. The internal adapter uses a JMicron chip that does not support UAS protocol on the Raspberry Pi 4 with any flavor of Linux. The issue is well...