You'll need to find a reliable source for NSP files. This community-driven and piracy-focused area can be risky, and details can't be provided here.
Do not use Goldleaf for updates larger than 100MB, as it has known timeout issues. miitopia switch nsp update 103
: This update ensures that the game's high-level customization—including the intricate wig and makeup systems—renders correctly across different hardware revisions [28]. How to Install (Manual Update) If you are managing your updates manually for an NSP file: Backup Save Data : Always ensure your save data is backed up You'll need to find a reliable source for NSP files