Passcode
How to change passcode if your locked out of your phone and it gets disabled for an hour
iPhone 8 Plus, iOS 15
Question marked as
If your iPhone has iOS 15.2 or later installed, check out this link→How to reset your iPhone, iPad, or iPod touch when you forgot your passcode - Apple Support. Otherwise:
See this Apple support link→If you forgot the passcode on your iPhone, or your iPhone is disabled - Apple Support
Or watch this companion video ⬇️
After restoring the phone using one of the methods above you can restore your most recent backup.