Re-download the update NSP from a verified source and clean install via DBI. Verification: How to Know It Worked
[Current Date] Target Console: Nintendo Switch (CFW / Atmosphere / Ryujinx / Yuzu) one piece pirate warriors 4 nsp update dlc work
The base game NSP and the update/DLC NSPs must share the same base Title ID. A game with a US Title ID cannot read an update or DLC package meant for the European or Japanese eShop regions. Re-download the update NSP from a verified source