If the game won't launch after the update, ensure your signature patches (sigpatches) are updated to match your current firmware. Conclusion
Once extracted, you will have a file usually labeled something like "Astral Chain [01007300020FA800][v65536].nsp." This is the actual update data. How to Install the 1.0.1 NSP Update
Resolves minor scripting errors in certain File (chapter) investigations.
When prompted, you can usually choose to install to "NAND" or "SD Card." For updates, either works, but SD Card is generally preferred to save internal space.
Once the process finishes, go to the home screen, highlight the Astral Chain icon, and press the (+) button. Check the version number under the title; it should now display v1.0.1 . Troubleshooting Common Issues
If your extraction tool says the .rar is "corrupt," the download likely failed. You will need to redownload the file.