2. Reboot 3. In terminal enter - “diskutil list” (note drive with same name as your drive and not data one) “sudo mount -o nobrowse -t apfs /dev/diskXsY /System/Volumes/Update/mnt1” (replacing y with your disk identifiers we found)
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cp -av /path/to/mixed/* /System/Volumes/Update/mnt1 (don’t copy paste, use your brain. You also may get pop-up about unsupported kexts, ignore it.) sudo bless --folder /System/Volumes/Update/mnt1/System/Library/CoreServices --bootefi --create-snapshot sudo reboot Enjoy!
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Is this to get rid of the you don’t have permission to open thing?
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For that, right click and click open

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