Fix A Xbox360 Software Update Failed - How To
: Turn off the console. Hold the Sync button (the small button used to link controllers) while turning the power back on. Keep holding Sync until the console fully boots to clear the failed update download from memory. Connectivity and Storage
: Ensure you have at least 190 MB (or 256 MB in Japan) of free space. How to fix a xbox360 software update failed
: Power cycle your router and modem. Unplug them for 5 minutes before trying the update again. : Turn off the console