Ensure you installed the specific DLC NSPs alongside the Update NSP. The update file prepares the game code for the content, but the actual assets reside in the DLC files. To help tailor this information to your specific needs, If you'd like, I can provide:

: If you are managing backup files or digital licenses, always ensure that your base game ID perfectly matches the update file ID. Mismatched regional files (such as mixing US and EU regions) will cause the game to crash on launch.

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: While character movement can still feel stiff, the update has doubled the number of animations to smooth out player transitions during legendary rallies. Key Game Features Review: Tennis World Tour 2 (Switch) - GamingBoulevard