If prompted for a password, check the source site (Ziperto) as they frequently use their domain name as the default password.
Wait for the transfer to complete. DBI will automatically install the update and notify you when finished. Return to the Switch Home Menu. Highlight the Splatoon 3 icon. Press the (+) button to open Options. SPLTOON3-(USA)-NSwTcH-NSP-Update121-Ziperto.rar
Once extracted, you should see an .nsp file. This is the actual update file. If prompted for a password, check the source
This specific file is an Update , not the base game. You must have the base version of Splatoon 3 already installed for this to work. If prompted for a password
Do not attempt to play online or access the eShop while using CFW, as this will lead to a permanent console ban.