Most "update work" failures happen due to booting via Hekate without fss0 patches.
First, a quick reminder for anyone confused: Chapter 1 is free on the official eShop. Chapter 2 is also free as a standalone download or as an update to Chapter 1.
You do not need an NSP file to play this game legitimately. However, the conversation around NSP updates usually involves: deltarune chapter 1 2 switch nsp update work
5.1. Title ID Management Nintendo assigns a unique Title ID to every piece of software. If the developer changes the architecture significantly, they may issue a "new" application, rendering the old update channel dead. In Deltarune's case, the update mechanism had to ensure that users who downloaded Chapter 1 for free could update to the bundle without re-purchasing, requiring specific entitlement checks on the Nintendo server side.
5.2. Save Data Persistence
A critical aspect of the update's functionality was ensuring that save.dat files created in Chapter 1 were correctly recognized by the Chapter 1 & 2 executable. This required the update to maintain the same unique user ID association and file pathing structure, despite the internal game code changing to support a chapter select screen. Most "update work" failures happen due to booting
Yes, properly sourced and installed updates for Deltarune Chapters 1 & 2 work flawlessly on the Nintendo Switch (both on standard firmware and custom firmware like Atmosphere).
However, success depends on three key factors: You do not need an NSP file to play this game legitimately
Since its surprise release in 2018, Toby Fox’s Deltarune has captivated fans of the Undertale universe. The arrival of Chapters 1 and 2 as a combined, free-to-start package on the Nintendo Switch eShop was a major event. However, for users navigating the technical side of digital game files—specifically the NSP (Nintendo Submission Package) format—questions often arise regarding installation, updates, and cross-chapter functionality. This article provides a solid, factual overview of how Deltarune Chapters 1 and 2 work in the NSP ecosystem on the Switch.