If you are managing this update via NSP files, here is the technical breakdown:
Update 1.0.3 represents a balance between the blurry launch version and the laggy "Ultra Texture" version. doom nsp update 103
: The update introduced a 3D Sound option , upgrading the sound system beyond its original two-speaker limitation to handle individual sound effect levels more realistically across multi-speaker setups. The Switch Story: Precision and Portability If you are managing this update via NSP
The most significant "1.0.3" update for on Nintendo Switch is for the recently released DOOM + DOOM II doom nsp update 103