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With the Big Sur release, Apple dropped support for even more Macs, even ones that was capable of running Catalina.
This website tries to cover as much information about installing Big Sur on unsupported macs as possible, providing necessary links to the guides, tools, kexts and other stuff.
Navigate website by using menu on the left.
!> Please consider, that me or anyone else but you is not responsible for any OS or device damage that can occur during the installation or usage! Try everything at your own risk and don't use mission-critical machines or ones with important data!