Hope not affiliated w/ Promise as this would be a significant miss on their part. I bought a Pegasus32 R6 with my new M1 mac mini and MBP, specifically to use with them, after verifying on both the Apple store and Promise websites that they specifically call out compatibility w/ M1 / Big Sur. Fortunately Apple gave no resistance to my return. But spent >1 hour on Apple tech support. Gave up on Promise tech support after 3 "can I place you on a hold" follwed by 10-30 minutes on hold followed by hang up. Guess they're stumped and can't stomach telling customers "sorry, it isn't working right now and we don't have a solution" followed by either "and we're working on it and expect something by MM/DD" or "and probably won't so might as well toss it in the garbage or return it if you can...good luck"