I have a 2012 iMac 21.5. Do you think the procedure you followed would work on mine? Anyone successfully load BS on a 2012 iMac with everything working? ThanksSUCCESS! Big Sur beta 3 on iMac late 2013 (iMac 14.1)
I have used the old method, csrutil disable from recovery passing from @jackluke opencoreloader3, then using @ASentientBot very simple installer with hax3. After installation all works perfectly: acceleration, wifi, bluetooth, internal sounds in and out and it is REALLY FAST on a Samsung T5 external SSD. Now I can test all the options and 3th party softwares. Its really a shame that Apple doesn't support it officially.
To all Big Sur on Unsupported mac forum users: Just tell me if you need help to patch this 7 years old Mac!
Thank you very much @jackluke and @ASentientBot I'm available for all test you could need to help others to fix issues, also for the Mac mini 2010.