Guys. The system is on DDR5. On BIOS F6 everything works, it boots. Attempting to update BIOS to a newer version stops booting at the very beginning. I think it's even before the kernel is loaded. Maybe I don't understand something about these new systems?
I have solution for this problem. Start install update. After first reboot you have a kernel cache error. Reboot to recovery hd (need cp, mkdir, rm skill) or to working system (install OS to flash or external disk). You must put files from com.apple.boot.* folder to other. Your Boot OS X disk...
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