How do Wii U patches work?

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Do the Wii U patches effectively modify the data as it comes off the game disc? Or do they replace the main executable and run off internal storage?
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Does the Wii U still get updates?
Software updates will be installed while the Wii U is powered down, and system updates will be installed the next time the Wii U is switched on. Further improvements to overall system stability and other minor adjustments have been made to enhance the user's experience.How do I do a system update on my Wii U?
Complete these stepsWhat does bricked Wii U mean?
It means it's about as useful as a brick now. It won't play games or display media at all... but you can throw it at people and maybe stack things on it.Do Wii U games need updates?
If connected online, the Wii U automatically checks for updates to your software. Any available updates will be downloaded and installed in the background.What Can You Do With A Hacked / Modded Wii U In 2021/2022?
Sources: Stack Exchange - This article follows the attribution requirements of Stack Exchange and is licensed under CC BY-SA 3.0.
Images: Teona Swift, Ivan Samkov, Pixabay, Eva Bronzini