iPhone unavailable error fix?
iPhone unavailable error fix for iPhone 12?
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See this Apple article: If you forgot your iPhone passcode
If you forgot your iPhone passcode - Apple Support
If you can’t get your iPhone to show the recovery mode screen and you need help, contact Apple Support.
If the iPhone is running iOS 15.2 see -> How to reset your iPhone, iPad, or iPod touch when you forgot your passcode
How to reset your iPhone, iPad, or iPod touch when you forgot your passcode - Apple Support