Updating wii firmware without internet
Jailbreak exploits are rarely supported on the latest firmware (plus, it's likely that future Homebrew and CFW support will be supported up to firmware 4.1.0).
Make sure your automatic system updates are disabled and future updates to your firmware are blocked.
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This will block your Switch from pinging Nintendo to check for updates.
Thanks to Switch Hacks for this helpful bit of information.
Considering that this update would take most anywhere from an hour to five hours to download, it's understandable as to why some users would apply the update, see that it's taking longer than expected to apply, and decide to ignore the warnings of not shutting off their console during an update.
Let me take a moment to remind you that jailbreaking your Switch might completely ruin its usability. The Switch is so very new that jailbreak options are very limited and not easily reversed (if at all).
If you only own one Switch, and you like using it, don't jailbreak it. The first thing you should do when powering on your jailbreak Switch for the first time is to disable automatic updates. You want to make sure your Switch doesn't start downloading any software updates that you don't want.
As an added precaution, you can also do as the header says: disable automatic software downloads.
If you go into internet settings, the option to enable/ disable is below the 'View Mac Address' button.
Sign up for free See pricing for teams and enterprises The listed DNS servers will block various Nintendo URLs that the Wii U communicates with.