I don't see the restore or update button on my iPhone screen.

Is this about your forgotten passcode?

In case your iPhone has iOS 15.2 or later installed, follow the steps in this article:

How to reset your iPhone, iPad, or iPod touch when you forgot your passcode - Apple Support

For older iOS versions follow this one, to erase it, using your computer:

If you forgot your iPhone passcode - Apple Support

to update read Update your iPhone, iPad, or iPod touch - Apple Support

to restore read

Restore your iPhone, iPad, or iPod to factory settings - Apple Support

and or

Restore your iPhone, iPad, or iPod touch from a backup - Apple Support