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1. Back up your data. 2. Sign out of iCloud and deauthorize iTunes. 3. Restart in macOS Recovery, erase the hard drive, reinstall macOS, and set up your Mac.
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1. Back up your data. 2. Sign out of iCloud and deauthorize iTunes. 3. Restart in macOS Recovery, erase the hard drive, reinstall macOS, and set up your Mac.