If Citra says the ROM is encrypted, use Batch CIA-3DS Decryptor to decrypt it. No-Intro Nintendo 3DS DLC and Updates Encrypted. Nintendo - Nintendo 3DS (Digital) (Pre-Install) Nintendo - Nintendo 3DS (Digital) (Dev ROMs) Unofficial - Nintendo - Nintendo 3DS (Digital) (Updates and DLC) (Encrypted) Unofficial - Nintendo - Nintendo 3DS (Digital) (Updates and DLC) (Decrypted) Nintendo - New Nintendo 3DS (Digital) (Deprecated) Nintendo - Nintendo 3DS (Digital) (Depreciated)
No-Intro Nintendo DSi (Decrypted+Encrypted) ()
If you are looking for Retro ROMs, see the Retro Games page.