For me, only with Catalina Update in the installation of Big Sur, being by the pen in the last reset of the stick, I can only update by Catalina 10.15.7 ai show of the ball without stress and using Clover 5129 and the newer kexts that came out just now. I prefer Clover and running smooth. I tested everything. I worked on it. I played on it all without problems.
And all the best for everyone at the Forum hug.
After much fooling around I finally got Big Sur running on my ancient hardware. Had to install it on a different machine though. Booting and running without issues using latest Clover. As far as I can tell nothing broke, Sleep and Wake both working. Some apps are noticably laggy compared to Catalina so I might switch back – anyway, I'm quite happy that it's actually working on a first gen i7 rig.