I got 2 Quest 2's for early Christmas. I successfully used Sidequest to mod Beat Saber to play custom songs on mine, yay!
But when after installing the old version .apk to my wife's Oculus using Sidequest, Beat Saber wouldn't start - it would show the Beat Saber opening splash screen but then would return to the Oculus Browser instead of showing the play menu. After a few uninstall/reinstalls, I allowed it to update to the current version, and it did the same thing! I rebooted the headset, and all apps were gone. I did a factory reset.
After the factory reset, I resynced it with my account so Beat Saber is available for install on the main menu. I assured that Developer Mode was still on and USB Connection Dialog was enabled (also double-checked that Account Sharing is off and no lock is set). When I plugged it into the computer, the Oculus gave the "Allow Access to Data" notice (Deny/Don't show again/Allow) but no USB dialog. Sidequest does not recognize the device, though Windows 10 does. If I switch the cable back to my Quest, Sidequest connects immediately after Windows sees it. Switch it back to my wife's and Windows sees it but Sidequest doesn't.