Hi apmezzo,
Thank you for posting in the Apple Support Communities. It sounds like you may be trying to restore a backup from a device that was on an older version of iOS, is that what the error indicates? If so, we would love to help see if we can get the issue resolved for you. Let's go ahead and follow the troubleshooting steps we've linked for you below.
Restore an iPhone, iPad, or iPod touch when a later version of iOS or iPadOS is required
If that doesn't address the issue, please provide additional details about what's happening, including any error messages you're getting. We're always happy to help.
Cheers!