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https://github.com/mlch911/one-key-hidpi this script helped me a lot into getting HDR and Night shift on my screen wanted to share it, since I got lots of benefits from your EFI - still searching for getting 5,1 Audio from HDMI

Big Sur brought significant changes to the way kexts operate with the kernel and further tightened filesystem protection. It's now most difficult for anyone to make any changes to /S/L/E folder. As such, kexts should be considered cacheable only from /L/E. To repair permissions after any any kext addition, removal or modification in /L/E, type the following Terminal commands: sudo chmod -Rf 755 /L*/E* sudo chown -Rf 0:0 /L*/E* sudo touch -f /L*/E* ` To rebuild the cache, type the following Terminal commands sudo kextcache -i / -> will invoke the required kmutil command sudo kcditto For additional information on the commands: man kmutil man kcditto

Looks like the above method no longer works, certainly not in Big Sur 11.4, possibly before. @Slice reminded us that Gatekeeper can be used as an alternative. Many people often disable Gatekeeper by default through Terminal command: sudo spctl --master-disable Kexts can be cached from /L/E in Big Sur (and Monterey) by re-enabling Gatekeeper, copying the kexts to /L/E through Terminal via sudo commands and authorizing the kexts from Security & Privacy PrefPane. Upon such authorisation, Gatekeeper will rebuild the cache and restart macOS with the newly cached kexts. Gatekeeper can then be disabled again afterwards. sudo spctl --master-enable sudo cp -Rf <path>/xxxx.kext /L*/E*/ GateKeeper can be disabled again afterwards.