Forgot my iPhone 12 Pro Max passcode

You will need to restore the device using a computer. The process will erase the device. Later you can restore your data from a recent back-up. Instructions here…

If you forgot your iPhone passcode - Apple Support

If you see an iPhone or iPad unavailable message or Security Lockout screen - Apple Support

Perhaps you have a friend with a computer who can help or you can make an appointment at the nearest Apple Store for assistance...

Apple Store - Find a Store - Apple