Use a tool like or SAK (Switch Army Knife) to check the Title ID of your base game NSP. You must download an update NSP with the exact same region (e.g., 01009B90006DC000 for US/World, 0100ABF008FE0000 for EU).
For those utilizing the NSP format, version 3.0.3 is known for its stability. In the context of modded Switch consoles (atmosphere/hekate): super mario maker 2 nsp actualizacion 303
The "303" error in the context of Super Mario Maker 2 usually points to a when trying to install or launch an update. Specifically, it indicates that the installed update (ver. 3.0.0 or later) is corrupted, incomplete, or incompatible with the base game NSP you are using. Use a tool like or SAK (Switch Army
: The profile now displays "likes" more clearly and has improved stability for Maker Points. : The profile now displays "likes" more clearly
For most users with an internet connection, the Nintendo Switch will download and install the update automatically when you attempt to launch the game. If you need to trigger it manually: Navigate to the icon on your Home Menu. Press the + Button to open the Options menu. Select Software Update and then Via the Internet . A Look Back: The Road to 3.0.3