ArcaOS Install Issue: Failed to restore A20 gate

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  • ArcaOS 5.0.6
  • Installation Issue

ArcaOS can not be installed due to this error on the installation phase.

Explanation
It seems to be an issue related to UEFI CSM. The same error message shows on older MacBooks with a CSM in the UEFI firmware. Seems to be an issue on the "MemDisk" component.
Workaround
Remove the HDD device from that machine, install ArcaOS on a different machine with that HDD and reinstall the HDD back on the original machine.
Additional Comments
It seems this issue may be solved on ArcaOS 5.1 with formal UEFI support.