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Thanks ed209, I had a look at those links and in the first one, he's referencing a MacbookPro5,5 (Released 2010) which uses 64-bit EFI. In the second, he's also using a machine with a 64-bit EFI, since the earliest Retina-enabled MBP was in 2012:

This particular machine uses a 32-bit EFI. Apple released quite a few machines using 64-bit processors and 32-bit EFI. I also have some 2007 iMacs that use 64-bit processors and 32-bit EFI, and they boot, install, and run Fedora beautifully - although the dual-core, non-hyperthreaded mobile-grade procs are only barely able to keep up with current-day tasks.

I went ahead and reverted the firmware and SMC coding of this system back to its 1 1 roots, but no change - I'm still unable to boot Fedora in EFI mode (or any of the other distros I've manually retrofitted with a 32bit EFI file).

Since Fedora's pioneering work in making 32-bit EFIs a standard part of the installer was done (I think primary by @pjones ? ), and considering my enjoyment of participating in the Fedora project in the past, I'd like to figure out what's going wrong here, solve it, and hopefully enable the project to support these cool old systems going forward.

I just don't know how to get any useful information out of the system; once I select any option from the GRUB menu on the USB installer, it just hangs for about 30-60 seconds and reboots. Other liveUSBs don't even reboot, they just hang until I kill the machine manually.

Further assistance appreciated (: and/or, if anybody is running a Mac Pro Classic (cMP or MPc) 1,1 or 2,1 from 2006 or 2007 successfully on Fedora, please share your experience here! It might just be that I have a funny bit of hardware or something, not sure.

Thanks kindly