iphone 12 factory reset
how to factory reset iphone12 while it being disabled
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If you mean that it is telling you the phone is disabled then
iPhone Unavailable, Security Lockout, or Disabled
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 remove your iPhone, iPad, or iPod touch passcode without a computer - Apple Support
video
ios 15.1 and earlier:
If you've forgotten your iPhone passcode – Apple Support (UK)
If you mean the phone is broken/kaput/dead then you cannot do that but the data is inaccessible to anyone