There’s no risk, but there’s also no official way to downgrade iOS, even though downgrading does work as long as the version of iOS you’re downgrading to is still being signed.

Is it safe to downgrade to iOS 13?

Can I downgrade iOS 14 to iOS 13? We’ll deliver the bad news first: Apple has stopped signing iOS 13 (the final version was iOS 13.7). This means that you can no longer downgrade to the older version of iOS. You simply can’t downgrade from iOS 14 to iOS 13…

Is it safe to downgrade your Mac?

Unfortunately downgrading to an older version of macOS (or Mac OS X as it was previously known) isn’t as simple as finding the older version of the Mac operating system and reinstalling it. … But it is still possible to downgrade your Mac.