Software for this iPad is not currently available.
Trying to remove iPad OS 17.1 Beta and return to regular iPad OS
iPad Pro, iPadOS 15
Question marked as
If you are currently enrolled in a beta programme and wish to return to using the current production version, this support page provides the necessary information to remove the beta from your iPad:
How to uninstall iOS beta software - Apple Support
iPadOS 17.0.3 is the current production release.