cckoinu Said:
"cannot sign out from find my: Hi, I was resetting my Mac, apparently I have to sign out from Find My first, but I have revised my account name before, Find My asked me to log out the previous account. I tried different combination (all the passwords I used) and it always showed the input was wrong. Any idea how can I solve this?"
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Logging Out of Find my:
So, is Find My associated to a difference Apple ID? Or is is associated tot the Apple ID that is currently signed in to iCloud on this Mac? If a different Apple ID, then use that Apple ID's password.
Is this a Used Mac?
If so, and you cannot sign in, then you need to have the person currently sign in to iCloud on it sign out on iCloud. Once they signed out, your need to restart the device, and then sign yourself in. Elsewise, it is useless to you. Go to: System Preferences, and click the name on the top left. the person who'll have perform as instructed here, including the iCloud logout: What to do Before you Sell, Give Away, or Trade in your Mac - Apple Support. The seller should have known better.
Learn from this:
So, contact them, seeing if this can be done. If this is on no option, then take this as a learning experience, knowing to always be allowed to log into it prior to purchasing a used Mac.