After a Switch firmware update (e.g., from 15.0.0 to 16.0.0), the encryption keys for NCA validation change. If your CFW’s prod.keys file is outdated, it may misread ProgramType.
are up to date, as missing decryption keys for newer updates can sometimes trigger generic file errors. Which emulator or tool are you using (e.g., Yuzu, Ryujinx, DBI) to trigger this message? The NSP file is missing a Program-type NCA. : r/EmuDeck the nsp file is missing a programtype nca upd
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