no legitimacy the moment u chose to use sx pro. (u try to purchase dlc? good luck, u will be banned 100% after your purchase... since they can get the tracking info that u used sx os)
u can't use nxshop/cdnsp now!!!! read my previous post!!!
read this:
https://gbatemp.net/threads/r-i-p-public-cdnsp-cert-as-nintendo-getting-better.515973/
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btw, u can't even legitmately purchase anymore. since u said nxshop already gives you error.(which means your console cert is banned already) this is superban, u can't even do online system update
just go the full offline pirate route.
and why u use nxshop in the first without knowing the consequences.....