I'm currently developing a game across all Apple platforms (iOS, macOS, & tvOS). External QA found an issue where one of our libraries does not work on iOS 13 devices; however, all my in-house devices are iOS 14 or later.
Is there a way or a best practice to install a much older version of iOS on an iPad Mini 4? I know some images are hosted at IPSW dot me; but those require jailbreaking the device. There are also some images hosted on the Apple developer portal here, but they don't go far enough back to cover iOS 13; likewise, I cannot find iOS 13 listed in the full downloads listing.
Is there really no (acceptable, legal) way for developers to install an older version of iOS on a device for testing? I've seen other threads asking the question, but no real acceptable answers...