How to Fix – A Fatal Error Occurred When Running Fusee (Complete Guide)

How to Fix – A Fatal Error Occurred When Running Fusee (Complete Guide)

Nintendo Switch pirates are receiving an irritating error message, “A fatal error occurred when running Fusee,” which has frustrated many gamers. Since hacking and jailbreaking consoles is a complex process, many are eager to find an instant solution to fix this error so that they can resume their gaming.

What is Cause behind “A Fatal Error Occurred When Running Fusee.” ?

Fatal errors can occur when trying to connect a gaming chair to a Nintendo Switch, and these errors can have multiple causes. It is difficult to provide a single solution without identifying the specific issue. Here are some common causes of these errors, You can also read this guide

  • Incorrectly organized payload injectors
  • Incorrectly formatted payload files
  • Mismatched hardware
  • Mismatched firmware version
A fatal error occurred when running Fusee

How to fix the “A fatal error occurred when running Fusee” issue

Before diving into detailed fixes, let’s discuss some quick solutions first.

  • Make sure your Nintendo Switch has the latest firmware and is fully charged.
  • Check that the USB cable is in good condition and working properly.
  • Ensure that the USB cable is securely connected to both the power switch and the system.
  • Make sure to update the Fusee Gelée software and use the correct version for your specific Switch model.
  • Run the software on your computer with administrator privileges.
  • If possible, try using a different USB port on the system.
  • If you have an antivirus program installed, try temporarily disabling it and running the software again.

Here are a few methods that can help fix the “A fatal error occurred when running Fusee” issue.

✅ Method 1# Inspect The SD Card

It is important to use an SD card that is formatted correctly, so keep an eye on it. Most emulators work well with NTFS or FAT32 formats.

If you encounter errors while playing music from the SD card, it can also cause this problem. To ensure everything is working properly, try formatting the SD card and test it in another device.

✅ Method 2# Update The Atmosphere and Hekate

  • When using Fusee, it’s important to update Atmosphere and Hekate with the latest stable versions. This ensures they work well with the newest Switch firmware.
  • Update fusee.bin and regularly check for updates to the configuration files to stay up to date with software changes.
  • Make sure to have all the necessary files for the programs to work properly after enabling the update setting on your memory card or Switch’s storage drive. Sometimes, updates can remove important configuration files needed for the emulator to function correctly.

✅ Method 3# Turn Off Auto RCM

Hekate has a feature called auto RCM that makes the console start-up in the default operating system automatically. But sometimes, this feature can bypass the modified OS and go directly to the stock OS.

To fix the fatal error, try turning off auto RCM in the Hekate settings and see if it resolves the issue.

✅ Method 4# Replace fusee files

Besides replacing your configuration files, you can also attempt to replace the fusee-primary.bin file currently in use with fusee.bin, and the fusee-secondary.bin file with package. This action should help fix the emulator configuration and resolve the error.

✅ Method 5 #Find a Solution on Reddit

Many frustrated users who encountered the “A Fatal Error Occurred When Running Fusee” error have taken to Reddit to share their problems and offer helpful tips that have worked for them in resolving the issue.

Here are a few Reddit posts that can help you find answers on how to fix the “A Fatal Error Occurred When Running Fusee” issue.

Reddit Post 1
Reddit Post 2
Reddit Post 3

A Fatal Error Occurred When Running Fusee

Where does fusee.bin go ?

The fusee.bin file should be placed in the root directory of your device or storage medium. It should be located in the same directory where other system files and folders are present.

The location of the fusee.bin file depends on the specific context or purpose for which you need it. Generally, fusee.bin is a payload file used for Nintendo Switch homebrew purposes, such as custom firmware installation or system modifications.

Fusee.bin can be obtained from trusted sources online, typically from homebrew or hacking communities. However, please note that I cannot provide or assist with obtaining such files, as it may involve unauthorized use or potential violations of terms of service.

It’s important to ensure you comply with legal and ethical guidelines when using any firmware or modifying your devices.

A fatal error occured when running Fusée. Incorrect fusee version! ?

To start the atmosphere, you need to update the payload you use. This update can be done on your PC if you push fusee with Tegra, or in your SD card bootloader folder if you start with hekate, Read this guide to know how to do it.


If the above-mentioned fixes don’t work, you can try searching for solutions online or asking for help in a forum like Reddit or another community dedicated to the Fusee Gelee exploit.

Remember, it is important to check the firmware version of your console before attempting any exploit. If the firmware version is higher than what the exploit supports, it won’t work. Always verify the firmware version before attempting any exploit.

Related Post: How to Fix – Atmosphere Error Code 2001-0123

Akash Singh

Akash loves to create & share informative ideas and tricks related to the internet, social media, technology, gadgets, and latest trends. In addition, he is passionate about learning and researching new things that excite him the most.