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how do I downgrade big sur to high sierra
MacBook Pro 13″, macOS 10.13
Do you have a Time Machine backup to Restore to/from?
https://support.apple.com/guide/mac-help/revert-to-a-previous-macos-version-mh15216/mac
If not…
There are numerous methods but the central idea must be to BOOT into the system installer. You just can't launch a system installer previous to the drive you are currently booted into....
how do I downgrade big sur to high sierra
