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Currently, I'm using your EFI with a GenSMBIOS generated serial, putting BaseSystem.* files into com.apple.recovery.boot and UEFI mode selected in BIOS (1.2.9) and trying to boot the installer that way. I'll get another USB stick to see if maybe that's the problem somehow.

I wish it was that simple. I've followed it to the letter, using the 0.6.4 OC files, including the DEBUG version. It never gets to running the kernel after it loads it from BaseImage.dmg with 1.2.9 BIOS. The 70 page thread is full of random caveats regarding BIOS versions and using UEFI or...

What's the current best starting point for Dell 7559: 4K, i7-6700HQ to get ANY macOS version running ? I can't seem to even boot the installer properly (High Sierra, Catalina, Big Sur), trying BIOS 1.2.2 , 1.2.4 , 1.3.1 and others. Thanks for any pointers.