Problem with my new iPhone

Recently I bought a new iPhone 14 Max Pro with a iOS 17 Beta release. While updating the phone with a cloud backup from my old iPhone 7 Plus the latest software (iOS17.5) has been installed on the phone. Now, every time I use my new phone the following message appears: A new iOS-Update is available. Please update from iOS 17 Beta.

Unfortunately I can't do this because the menu "Settings", "Common Settings", "Software updates" shows that I've already installed the latest version. The message is "17.5 - Your iOS is at the latest release".

I've already tried to set my phone to the factory settings and several other steps like disabling Beta-Updates didn't work.

What can I do?

By the way: I'm not an Apple professional I'm a standard user but the standard Apple Support told me they can not help me but to reach out to you guys.

Problem with my new iPhone
 
 
Q