HOw to reset passcode without reseting iPhone?
I have not forgot my passcoade but the iPhone thinks I have. How do I reset the passcode without resetting iPhone?
You might try a forced restart - as you can’t do any harm:
Force restart iPhone – Apple Support (AU)
Beyond that unfortunately — and regardless of “how” the phone got to it’s current state — IT gets the “Final Vote.”
Your only way ahead is to reset the device and restore from a backup.
If you see an iPhone or iPad unavailable message or Security Lockout screen - Apple Support