Troubleshooting a Fatal Error When Running Fusee: Common Causes and Solutions


A “fatal error occurred when running fusee” message can be frustrating and confusing for Switch users who are trying to launch custom firmware. The error can occur due to various reasons, including outdated firmware, incorrect file format, or corrupted files. If you are facing this issue, don’t worry, we have got you covered. Here, we will discuss the common causes and solutions for the “fatal error occurred when running fusee” error.

  1. Outdated firmware

One of the primary reasons for the “fatal error occurred when running fusee” message is outdated firmware. If you are using custom firmware on your Switch, it is essential to ensure that it is up-to-date. Updating the firmware can often fix the issue and help you launch custom firmware without any issues.

  1. Incorrect file format

Another common reason for the “fatal error occurred when running fusee” error is the incorrect file format. If you are trying to launch custom firmware, ensure that you have downloaded the correct files in the right format. For example, if you are using a .bin file, ensure that it is not corrupted and in the correct format.

  1. Corrupted files

Corrupted files can also cause the “fatal error occurred when running fusee” error. If any of the files required for launching custom firmware are corrupted, it can cause the error message. To fix this, you can try to re-download the files and ensure that they are not corrupted.

  1. Incompatible firmware

If you are trying to launch custom firmware that is not compatible with your Switch’s hardware or firmware, it can cause the “fatal error occurred when running fusee” message. Ensure that you have checked the compatibility of the firmware with your Switch before trying to launch it.

  1. Overheating

Overheating can also cause the “fatal error occurred when running fusee” error. If your Switch is overheating, it can cause the system to shut down and display the error message. Ensure that your Switch is not overheating and that the fans are functioning correctly.

  1. Hardware issues

If none of the above solutions work, it is possible that your Switch may have some hardware issues. In such cases, it is recommended to take your Switch to a professional technician to diagnose and fix the issue.

Steps to Fix the Fatal Error When Running Fusee

If you have encountered the fatal error when running Fusee, there are some steps you can take to fix it. Here are some of the most common solutions:

1. Check Your USB Cable and SD Card

First, make sure that your USB cable and SD card are functioning correctly. The USB cable should be properly connected to your computer, and the SD card should be inserted into the correct slot. Also, check to ensure that your SD card is not corrupted or damaged. If necessary, try using a different USB cable or SD card.

2. Update Your Drivers

If your USB drivers are outdated or not installed correctly, this could cause issues with Fusee. To update your drivers, go to your computer manufacturer’s website and download the latest drivers for your USB ports.

3. Disable Your Firewall or Antivirus

Sometimes, a firewall or antivirus program can interfere with Fusee’s operation. To check if this is the case, try disabling your firewall or antivirus temporarily and see if Fusee works. If it does, you may need to configure your firewall or antivirus settings to allow Fusee to run.

4. Reinstall Fusee

If none of the above steps work, you may need to reinstall Fusee. First, uninstall Fusee from your computer and then download the latest version from the official website. Make sure to follow the installation instructions carefully.

5. Check Your Switch’s Firmware

Finally, make sure that your Switch’s firmware is up to date. If your firmware is outdated, this could cause compatibility issues with Fusee. To update your firmware, go to your Switch’s settings and select “System Update.” Follow the instructions to update your firmware to the latest version.


In conclusion, the “fatal error occurred when running Fusee” error can be frustrating, but it is not uncommon. By following the steps outlined in this article, you can fix the issue and get back to using Fusee as intended. Remember to always download Fusee from a trusted source and keep your drivers and firmware up to date to avoid future issues.

If you are still experiencing issues with Fusee after trying these solutions, it may be worth seeking additional help from online forums or professional support services. With persistence and patience, you can overcome the “fatal error occurred when running Fusee” error and continue using this useful tool for your Nintendo Switch.

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