Even with a working update, Diablo II: Resurrected will try to phone home to Blizzard's servers. On a hacked Switch with no internet (or with 90DNS blocking Nintendo), this causes a 30-second hang at the title screen.
If you are managing files manually or using local installation tools, ensure the following to ensure the update "works": Base Version & DLC Reign of the Warlock diablo ii resurrected switch nsp update of work
Installing the latest updates without a proper connection to Battle.net may trigger "Failed to Authenticate" errors. Users often use tools like Linkalho to link accounts offline. Even with a working update, Diablo II: Resurrected
: This major expansion added the Warlock, the first new playable class in over 25 years. It also introduced new treasures and quality-of-life updates. Console Fixes Even with a working update