Hacking Some questions regarding updating only emuMMC

[Ichigo1000]

I have been debating on updating my switch that is on 9.0.0 on sysNAND and emuMMC. I read that on the NH switch guide, updating from 9.0.0 to 12.0.2 would update the gamecard firmware also, making the slot unusable if downgraded. Here is where I got confused. Is it only talking about emuMMC downgrades, or will it affect sysNAND, making the gamecard slot unusable if I ever want to play on it on sysNAND 9.0.0? Or on the other hand, will the gamecard be rendered useless while on emuMMC on 12.0.0 until I update sysNAND to match the "gamecard firmware"?

 

[Draxzelex]

I recommend posting your question in the Switch Noobs Paradise instead.