Change previous owner's Apple ID?
My used iMac still has the previous owner's Apple ID on it. How can I change it?
iMac, macOS 10.12
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The original owner should always do that before selling.
see > What to do before you sell, give away, or trade in your Mac - Apple Support
Now you have to skip to step #6 and follow the > erase your hard drive and reinstall macOS instructions.
