All currently known Wii U exploits can, unlike e.g. the Nintendo Switch RCM exploit, be patched by a system update. Although the Wii U is no longer officially supported, Nintendo may still release updates for it. Namely, the updates 5.5.3, 5.5.4 and 5.5.5 were all released after the Wii U was discontinued, so blocking updates is still a recommended action.
?> This method of update blocking is a bit more advanced than DNS Blocking and uses a homebrew app to modify system files. However, it has the advantage that the eShop's functionality will not be restricted.
?> This method is the easier method and is recommended to less advanced users. It does, however, prevent the eShop from working. This can be worked around by running [NNUPatcher](https://wiiubru.com/appstore/zips/nnupatcher.zip) before starting the eShop.