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That seems to make it exit even earlier on an RTC read failure.

Also, I tried disabling all the debug stuff. Apple logo and progress bar shows up but it just gets to like 5% and then goes to the black screen.

I have, but just recently as I was testing this. I tried it before a BIOS update, no dice. After, no dice. I have all the correct options as well, that is, disabled CSM, IOMMU, Fast Boot, Secure Boot, Serial port. (no COM/PAR port) Also tried with and without Above 4G and ReBAR (changing...

Tried adding MMIO whitelist, disabling reBAR and setting ResizeAppleGpuBars=-1, nothing worked.

For the record, sonoma has the same issue. I also noticed that it spams "vm_shared_region_start_address() failed".

Booting OpenCore works fine; after that it gets past a bunch of text, but after a few seconds the screen goes black and eventually the system resets after a minute or so. I took a slomo video and the last things I could see were: Unsupported CPU Unsupported PCH Couldn't alloc class...