This guide:
https://switch.hacks.guide/
There's 1 Nintendo account as the only Switch, so I hope I don't need to do anything.
So account setup on this old Switch I'm trying to mod is as follows from left to right before starting apps/games:
Account 1: My own account, linked to 3 Switches, Pass enabled on Switch 2.
Account 2: My brother that used the account on the old Switch, the only Switch that has been linked too.
6 other profiles without Nintendo accounts. They're for Animal Crossing to build extra houses.
So account 2 has probably the Pass Enabled console? So is it pass enabled so I can continue the guide, otherwise I'm doomed.
From the guide:
"If you choose the emuMMC path introduced later in the guide, you will also need a microSD card that is
at least 128 gigabytes. In this path, it'll be important to disable the
Automatic Save Data Cloud function beforehand, as well as making sure
the Switch is set as the primary Pass-Enabled console."
^So there's that, unfortunately.