Factory reset old iPhone
iPhone Unavailable in my 11 pro max forgot password, how to factory reset
iPhone 11 Pro Max
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If you forgot your passcode, you can use your Apple ID and password to erase and reset your device without a computer.
If you enter the wrong passcode on your iPhone Lock Screen too many times, an alert lets you know that your iPhone is disabled. (Learn what to do if you see "[Device] unavailable" or "Security Lockout" on your iPhone or iPad.)