I’m having problems with my Wii U system update
Restarting the download
If your system update fails, there are a number of things you can do.
If this was your first attempt at a system update, please try again. If this does not work, or you have previously updated your system successfully, follow the advice below.
Go to Download Management and delete the incomplete download. Then try starting the download again. If this does not work, restart your wireless network.
Restarting your wireless network
If restarting the download does not work, we recommend that you restart your home network. Switch off your wireless router, unplug it from the mains and leave it for 30 seconds.
After 30 seconds, plug it back in and wait for the device to restart. Once restarted, attempt the download again.
Adjusting network firewall settings
It may be the case that your network’s firewall settings are stopping the download. This guide is provided for information purposes, but it is your decision as to whether you wish to adjust the security settings for your network.
For information on how to adjust your wireless network’s firewall settings, please see the manufacturer’s guide.