iPad locked by Activation Code
How can I reset my iPad that is locked by Activation Code?
My previous email to set up the login at App Store was lost and I could not recover the password. How can I unlock my iPad?
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Turn off Find My iPhone Activation Lock - Apple Support
the fact that the appleID is an email which is no longer in use does not mean the appleID stop working
if you forgot the appleID password If you forgot your Apple ID password - Apple Support
if you forgot the appleID itself If you forgot your Apple ID - Apple Support
otherwise you need to present proof of purchase to apple Contact Apple Support