I use emunand when i do homebrew stuff and sysnand where i play my bought games but in the past i needed to but cfw on sysnand in order to fix warmboot error if sysnand and emunand firmware were mismatched or updated in wrong order
Havent updated my mariko switch in a while. I forgot after i update atmosphere should i first update sysnand or emunand to avoid needing to do boot into syscfw so it does warmboot error fix