Big Sur on iMac 27", Mid 2011, flashed 4GB NVIDIA Quadro K4100M by Nikey22, having issues with screen brightness, any ideas? Brightness control was working with Catalina Patcher, after installing Big Sur
APPLE IMAC 27" 2011 3.5GHz Quad Core i7 10 GB RAM NVIDIA Quadro K2100M EUR 700,50 - PicClick IT
Apple iMac 21.5" Slim intel® Quad-Core i5 2.9GHz Late 2013 (Ricondizionato) macOS Catalina - Smart Generation
Installing Mac OSX Catalina on a Unsupported Macbook, iMac, & Mac - YouTube