Hello, and welcome.
I don't know if anyone else has an EFI-bootable Macbook 4.1 here. This is a small community, and for specific hardware like this, you may have better luck posting about this to the misc@ mailing list, which is read by a much larger audience of users, and about half of the developers.
I know that for 5.9, both the miniroot59.fs and install59.fs images are designed to be bootable via EFI or via legacy BIOS. But I don't have a Macbook, and apparently, no one else who is active on this forum has one either.
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