It's probably because the nands are still linked or something. Either get rid of emunand completely by following the guide to the end (unless you need it for something, though AFAIK it's pretty much useless with a9lh..) or try this:
"I think I had the same error I know it was the same issue though.
how I fixed it was formatted sysnand and then emunand and then sysnand again.
I think it was because I didn't unlink my NNID from the sysnand but for whatever reason it fixed it."
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Also, do all of the formatting with TinyFormat not the system format.
Well i'll try but i already followed the tutorial till the end :/
Formatting both nand with TinyFormat will erase everything so i'll have to installe lumaupdater cia again right?