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Nintendo have now released the Wii U's second firmware update since the console was launched two and a half weeks ago.
The first update weighed over 1GB and the new update is reported to be approx 625MB. This update is said to bring more system stability improvements.

Here is Nintendo's official advice regarding updating your Wii U

“A new system update is available now for your Wii U. Please read the following important information on updating your system.

If this is the first time you are updating your system:

The update can take up to an hour to download. The new system update may take an extended amount of time to download. Depending on the speed of the Internet connection used, it could take an hour or more to download and install. Please be patient.

During the update, the progress bar displayed on the Wii U GamePad may take a while to start moving. This is normal.

Do not unplug your system while the update is downloading or installing. If the system update is interrupted by unplugging the system, you may damage the system.


If you have downloaded the previous system update (before December 4) and are now downloading the latest update:

If your system is connected to the Internet, it will automatically download the system update in the background, which allows you to use your system while the update is downloading. You can check the status of the new download through the Download Manager screen.

The update can take up to an hour to download. The new system update may take an extended amount of time to download, even if you have already performed the previous update.

If the download is happening in the background, it is okay to power off the system using the power buttons of the system or the GamePad. The update will resume when the system is powered back on.

Do not unplug the system while the update is downloading or installing. If the system update is interrupted by unplugging the system, you may damage the system.”

As we have previously reported, if you do manage to brick your Wii U. We advise you either get in contact with Nintendo support or with the reseller you brought the console from.