It’s been a quiet few months for Deltarune fans waiting for news on Chapters 3, 4, and 5. But if you’re currently playing on a modded Nintendo Switch or keeping your digital library backed up, there’s been some technical movement regarding Deltarune Chapters 1 & 2 (the NSP release).
Let’s break down what the latest update actually does, how it affects performance, and what "working" means for the current scene.
Symptom: Tinfoil says the update is installed successfully, but when you hover over the game icon, it reads "Ver. 1.0.0," and you don't see the bug fixes. deltarune chapter 1 2 switch nsp update work
The Fix: You need to reset the required system version flag. Use DBI (Don't Be Idiot) installer.
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. Deltarune Chapters 1 & 2 on Switch: The
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 via Hekate without fss0 patches. Launch DBI
fusee.bin from the SD card root.fusee.bin loads full sigpatches and KIP patches, which are required for Deltarune’s update to bypass Nintendo’s anti-CFW checks.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.
The core technical hurdle regarding the Deltarune "update" was the structural shift between versions.
3.1. The Chapter 1 Standalone Model Initially, Deltarune Chapter 1 existed as a self-contained application ID. Its filesystem contained assets strictly for the first chapter.
3.2. The Chapter 1 & 2 Merge When Chapter 2 launched, the developers did not simply append data to the existing Chapter 1 structure. Deltarune is built in GameMaker Studio 2 (ported to Switch via specialized middleware). The update required a restructuring of the asset index.