how to connect a disabled iPhone to Itunes
how to connect a disabled iPhone to iTunes
iPhone 12 Pro Max, iOS 14
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You can sometimes remedy this without a computer if on iOS 15.2 or later by tapping on "erase iPhone" , but you will still need the Apple ID password. It will WIPE the phone, no choice!
How to reset your iPhone, iPad, or iPod touch when you forgot your passcode - Apple Support
video
ios 15.1 and earlier:
If you've forgotten your iPhone passcode – Apple Support (UK)