Demote or erase a disk from a later version MACOS-Error degrading or erasing a disk from a higher version of MACOS: Incompatible disk This disk uses a feature that is not supported by this version of macOS
Demote or erase a disk from a later version of MACOS Error: Incompatible Disk This disk uses a feature not supported by this version of macOS
Incompatible disk This disk uses features not supported by this version of macOS
Reason: When demoting or erasing a disk from a later version of MACOS, you only need to format the partition instead of erasing the entire disk.
Solution: Reinstall the system, only the partitions are displayed by default when erasing the disk, select the entire hard drive in Disk Utility, select Mac OS Extended (Journaled) as the partition format, and install MACOS.
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