If you don't have a hard drive, plug in a formatted . 3. Use a USB Flash Drive (Offline Update)
If the update is stuck halfway, you can reset the update "memory." Go to > System > Storage . Enter this button sequence: LB, RB, X, LB, RB, X . How to fix a xbox360 software update failed
Unzip the file and copy the $SystemUpdate folder to the root of a USB drive. Plug the USB into your Xbox 360 while it is turned off . If you don't have a hard drive, plug in a formatted