https://wccftech.com/apple-releases-macos-big-sur-device-support-update-to-fix-bugs-while-restoring-or-updating-iphone-and-ipad/

If you have a Mac, then you should download the latest 'Device Support Update' update which Apple has just released for Big Sur users.

macOS Monterey is several weeks away and right now those running macOS Big Sur should download the update which has been made available to them over the air. Dubbed as 'Device Support Update,' it basically fixes issues, if you were having any, while trying to restore or update an iPhone and iPad using your Mac.