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Solving NVIDIA driver install problems
After editing the kext, when you run the command
kext-dev-mode allowing invalid signature -67062 0xFFFFFFFFFFFEFA0A for kext AppleGraphicsDevicePolicy.kext
In your output you are only seeing FakeSMC.kext which means that the modifications you made to the AppleGraphicsDevicePolicy.kext were not saved because it still has a valid signature.
Can you explain in more details on the first point?
I try nvda_drv=1 without nv_disable=1 after each modification.
After editing the kext, when you run the command
sudo kextcache -system-prelinked-kernel
You should see something like this in the output
kext-dev-mode allowing invalid signature -67062 0xFFFFFFFFFFFEFA0A for kext AppleGraphicsDevicePolicy.kext