This is almost always a Signature or Firmware issue.
The following is for educational purposes regarding file management.
For the scope of this article, "Chapter 1&2" generally refers to the free demo version that includes the first two chapters, which received numerous updates and fixes over time.
Originally, Toby Fox released DELTARUNE Chapter 1&2 as a completely free, standalone package on the Nintendo eShop. Following the launch of Chapters 3 and 4, the deployment architecture changed:
how long do you think the full game will be once it's fully released? deltarune chapter 1 2 switch nsp update work
If your update does not appear to "work" or the game fails to launch after patching, consider the following:
Update Atmosphere to the latest version, update your Nintendo Switch firmware using Daybreak , and ensure you have refreshed your Sigpatches/Sys-patch to match the new firmware version. Issue 2: Only Chapter 1 is Playable
The standalone "Chapter 1&2" title ID has been phased out on official storefronts in favor of a unified base application. This guide explains how the updated file structure operates, how to ensure your update files work correctly, and how to preserve your hard-earned save progress. The Evolution of DELTARUNE on Nintendo Switch
: The specific update file (e.g., version 1.0.x) that adds Chapter 2 and subsequent patches. This is almost always a Signature or Firmware issue
Toby Fox (the creator of Deltarune and Undertale ) has always supported fan content, ROM hacks, and even watching full playthroughs. However, he’s also clear:
Use the Lockpick_RCM homebrew payload to dump your system's latest prod.keys file. Without these updated keys, your Switch installer will throw a verification error. 2. Match the Correct Base and Patch Versions
// Restore Save Data Mapping restore_user_save(USER_ID_CURRENT);
If you are updating to prepare for new chapters, ensure your save files are properly managed. Community-created "Perfect Saves" are available for download if you want to skip the 100% completion grind for pacifist, neutral, or "weird" routes before Chapter 3 launches. Originally, Toby Fox released DELTARUNE Chapter 1&2 as
The full paid release (v1.0.0 for Chapters 1–4) launched on June 4/5, 2025 Status of Chapters:
A common issue isn't the update itself, but the game failing to recognize save data between chapters or across different versions of the demo. Old vs. New Demo:
Disclaimer: This article assumes familiarity with modified Nintendo Switch consoles. Always download game content from official sources or reputable community archives. If you'd like, I can: between base NSP and update NSP.