2020 SOLUTION/FIX Macbook A1502 "The volume recovery on disk1s3 couldn't be unmounted because..."
How to erase an encrypted Macintosh disk and install a fresh OS
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My customer had gotten a few mac books as collateral for loans, but they did not come through, so these macbooks have password protected accounts on them... this is how i went about erasing the encrypted Disk to reset and install a fresh Mojave.