Download the latest patch/update to your PC from one of the trusted websites and install it via DBI or TinWoo Installer? How do you usually install patches/updates?
Then you are out of luck as you cannot patch games on the Mig Switch. Either you have to hope that there is a retail cartridge dump of the game you want with the DLC/update pre-patched or go on without it.
You can just pirate it on emuMMC or if you're really religious, dump it from your sysMMC to install it on emuMMC.
The only way I know of requires you to have another console, preferably modded, that has the same game you'd like to update on the version you'd like to update to. You can match the game versions locally between two Switches, therefore updating the version on your Switch that uses MIG Switch flashcart without connecting to the Nintendo servers. However before you do that make sure that you have 90DNS set up as you'll need to turn on WiFi in order to initiate local connection with another Switch.
However, there might be a problem: If you're using incomplete dumps and staying offline all the time hoping to evade ban, you're probably just delaying the inevitable. Complete/Full dumps should be fine to update this way, but I'm not sure if the publicly available dumps are safe to use and therefore avoid getting banned. It should be fine to use shared dumps between a small group of people that you share your own dumps with.
WOW. Thanks guys for finding time and patience for such of detailed explanation.
Appreciated.














