Legacy booting to Linux ISOs with better compatibility using .iso83 (e.g. RHEL 9)

Note: The instructions below apply to E2B legacy booting only. If you have problems Legacy+UEFI-booting a payload, then convert the ISO file to a .imgPTN23 file using MakePartImage. When Easy2Boot boots to an ISO, it writes an entry to the empty USB drive MBR Partition 4 slot within sector LBA0 on the USB drive (which

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