The firmware then reads the update file from the internal EFI partition. On my HP PC, a firmware update is performed by first copying the update file to the FAT32 formatted internal EFI partition, then the firmware is asked to update itself. I do not know for sure why the internal drive is needed for firmware updates. This would mean you could end up failing to install a clean version of macOS or have a failure while running a routine update to macOS. Currently, firmware updates are included in with certain versions of macOS. Be aware, the internal drive is needed to do firmware updates.
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