Factory reset iPhone SE
How to factory reset any iPhone without an Apple ID password… is it possible?
iPhone SE, iOS 14
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You might be asked for the phone's passcode instead of the Apple ID password.
If you forgot the Apple ID (iCloud) password, enter the Apple (iCloud) ID, and click Forgot Password. See if you can get a Rescue or Notification email option if necessary. Link to contact Apple Support at the end of the 2nd article.