thats what i thoughtThis is the information I could find regarding this. Correct me if I'm wrong.
Rename your .NSX file to .NSP, then unpack the .NSP. Then either you can open the .tik file in a Hex Editor and add the titlekey to line 180 once using the title key included in this archive. Finally, just install the nca with tinfoil or pack it to NSP.
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I dont think so, I have key that somebody said, it was 01006A800016E000 but the thread was deletedif you have the titlekey for said nsx file, just add it to the titledb, and run nut with the --unlock-all command ... that will add the titlekey to the nsx and rename to nsp