you sure can…but only for a little while. Once Ninty bans your switch from accessing Online Services then you won’t be able to. You can read about ban risks here:
Switch Banning Hub — The
@Draxzelex definitive place to read about console bans and how to reduce your risk of being next!
Be safe out there, my friend.
After taking my own advice I searched through the ban hub and didn’t find any reference to Challengers. This might not be as risky as I initially thought. Since I clearly don’t know what the fork I’m talking about here, I’m going to strike my statement in hopes someone more knowledgable than me can speak definitively on SSBU Challengers piracy.
Incognito masks your Switch‘s serial number. Your serial number is required to access Ninty servers and services. You will not be able to connect. Incognito is a “self-ban” if you will.
If your Sysnand is clean you can boot into OFW and download updates there and then dump them for use in your emunand or even copy your Sysnand with updates to your emunand again. I hear that’s a bit cumbersome for sure.
The easiest way will be to grab updates from the same Shop or site where you find backups of the base games that other sinners have uploaded.
Typically when you find one you find the other…