Updating xbox offline
The emergency offline update is intended for users having trouble downloading the system update from Xbox Live.In order to download the update offline, users will first need to know what OS their system is running.After you reset your Xbox One, you'll need to attempt the update again.If it still fails, then you can try checking your network connection, attempt an offline update, or perform a full factory reset.
Once it restarts, you have to wait to see if the update completes.
choose the right option for you, there are two osu files.osu1 used for offline system updates using the diagnostics tool and osu2 for when your console won’t show the diagnostics tool onscreen.
There is also a seventh reason that Xbox One consoles fail to update, but you can't do anything about it yourself.
That means you can reset your Xbox One, finish the update, and go right back to playing your games without having to download them again.
This process also leaves all of your game save data intact, so you won't even lose your progress.