If you are a Nintendo Switch owner who likes to customize your system with custom firmware (CFW) and homebrew applications, you may have heard of fusee. Fusee is a payload that allows you to launch CFW on your Switch by exploiting a vulnerability in the boot process. Fusee is part of the Atmosphere CFW project, which is one of the most popular and widely supported CFW options for the Switch.
However, sometimes things can go wrong when you try to run fusee on your Switch. You may encounter a fatal error message that says something like this:
“A fatal error occurred while running Fusee. Incorrect fusee version! (program=0xb6b6ac70, mtc=0xb4dcf71) Press POWER to reboot.”
This error means that the fusee version you are using is incompatible with the firmware version of your Switch. This can happen if you update your Switch firmware without updating your fusee payload, or vice versa. If you see this error, you will not be able to boot into CFW or access your homebrew apps.
Fortunately, there is a way to fix incorrect fusee version and get rid of this error. In this article, we will show you how to do it in a few simple steps. We will also explain what causes this error, how to prevent it from happening again, and what to do if you still have problems after following the guide.
What Causes Incorrect Fusee Version Error?
The incorrect fusee version error is caused by a mismatch between the fusee payload and the Switch firmware. The fusee payload is a file that contains the code that launches CFW on your Switch. The Switch firmware is the software that runs on your Switch and controls its basic functions.
The fusee payload and the Switch firmware need to be compatible with each other to work properly. If they are not, the fusee payload will fail to launch CFW and display the error message.
The reason why the fusee payload and the Switch firmware can become incompatible is because they are both updated frequently. Nintendo releases new firmware updates for the Switch regularly, usually to add new features, fix bugs, or improve security. The Atmosphere CFW project also releases new versions of the fusee payload regularly, usually to support new firmware updates, add new features, fix bugs, or improve security.
However, the fusee payload and the Switch firmware are not always updated at the same time. Sometimes, Nintendo releases a new firmware update before the Atmosphere CFW project releases a new fusee version that supports it. Sometimes, the Atmosphere CFW project releases a new fusee version that supports a new firmware update before you update your Switch firmware.
If you update your Switch firmware without updating your fusee payload or update your fusee payload without updating your Switch firmware, you will end up with an incorrect fusee version error.
The solution to fix incorrect fusee version errors is simple: you need to update both your fusee payload and your Switch firmware to the latest versions that are compatible with each other. Here is how to do it:
Step 1: Check Your Current Fusee and Firmware Versions
Before you update anything, you need to check what versions of the fusee payload and the Switch firmware you are currently using. This will help you determine what you need to update and where to get the latest versions.
To check your current fusee version, you need to look at the fusee.bin file that you use to launch CFW on your Switch. This file is usually stored on the root of your SD card, or in a folder called bootloader/payloads if you use Hekate as a payload launcher. You can check the fusee.bin file on your computer by right-clicking on it and selecting Properties. You will see the file size and the date modified. You can compare these values with the latest fusee release on the Atmosphere CFW project’s GitHub page. The latest fusee release as of writing this article is 1.3.0, which has a file size of 94.2 KB and a date modified of March 24, 2022.
To check your current Switch firmware version, you need to boot your Switch normally without launching CFW. You can do this by holding the power button for a few seconds and selecting Power Options > Turn Off. Then, turn on your Switch again and go to System Settings > System > System Update. You will see your current firmware version on the top right corner of the screen. You can compare this value with the latest firmware version on Nintendo’s official website. The latest firmware version as of writing this article is 14.0.0, which was released on March 23, 2022.
Once you have downloaded the file, you need to rename it to fusee.bin and replace the old fusee.bin file on your SD card with the new one. If you use Hekate as a payload launcher, you need to place the new fusee.bin file in the bootloader/payloads folder on your SD card. If you use another payload launcher, you need to place the new fusee.bin file in the root of your SD card.
If your firmware version is older than the latest version, you need to update it to the latest version that is supported by your fusee version. To do this, you need to boot your Switch normally without launching CFW. You can do this by holding the power button for a few seconds and selecting Power Options > Turn Off. Then, turn on your Switch again and go to System Settings > System > System Update. You will see a prompt to update your system software. Follow the on-screen instructions to complete the update process.
Alternatively, you can update your firmware manually by using a homebrew app called ChoiDujourNX. This app allows you to install firmware updates from files stored on your SD card, without burning any fuses or connecting to the internet. This way, you can preserve your ability to downgrade your firmware in the future, if you ever need to. However, this method is more complicated and risky, and you should only use it if you know what you are doing. You can find more information and instructions on how to use ChoiDujourNX on its GitHub page.
Step 4: Test Your Fusee and Firmware Versions
After you have updated both your Fusee payload and your Switch firmware, you need to test if they work properly and if the incorrect Fusee version error is gone. To do this, you need to launch CFW on your Switch by using your payload launcher of choice. If everything goes well, you should see the Atmosphere logo and boot into CFW without any errors. You can then access your homebrew apps and games as usual.
If you still encounter the incorrect fusee version error or any other errors, you may have done something wrong during the update process, or there may be some other issues with your Switch or your SD card. In that case, you should try to troubleshoot the problem by following some common tips, such as:
Check if your SD card is formatted correctly and has enough free space.
Check if your SD card files are corrupted or missing, and restore them from a backup if possible.
Check if your payload launcher is updated and configured correctly.
The best way to prevent incorrect fusee version error from happening again is to keep both your fusee payload and your Switch firmware updated to the latest versions that are compatible with each other. You should also avoid updating your Switch firmware or your fusee payload without checking their compatibility first.
To keep your fusee payload updated, you should check the Atmosphere CFW project’s GitHub page regularly for new releases, and download and replace the fusee.bin file on your SD card whenever there is a new version available. You should also check the changelog and the readme files for any important information or instructions regarding the new version.
To keep your Switch firmware updated, you should check Nintendo’s official website regularly for new updates, and update your system software through the System Settings menu whenever there is a new version available. You should also check the Atmosphere CFW project’s GitHub page for any compatibility issues or warnings regarding the new firmware version.
Troubleshooting Tips:
Check SD card formatting and ensure sufficient free space.
Verify the integrity of SD card files; restore from a backup if necessary.
Confirm the payload launcher is updated and configured correctly.
Ensure the Switch battery is charged, and the USB cable is functional.
Inspect the Switch for hardware damage or defects.
Prevention Measures:
Regularly check the Atmosphere CFW project’s GitHub page for fusee updates.
Download and replace the fusee.bin file promptly upon new releases.
Check Nintendo’s official website for Switch firmware updates.
Update system software through System Settings, ensuring compatibility with CFW.
Conclusion: Modding Mastery with a Flawless Fusee
Congratulations! You’ve successfully navigated the intricate process of fixing the Incorrect Fusee Version error on your Nintendo Switch. By keeping your fusee payload and Switch firmware in harmony, you ensure a smooth and error-free modding experience.
Remember, the key to modding mastery lies in regular updates and cautious compatibility checks. Stay informed, explore new releases, and revel in the limitless possibilities that custom firmware and homebrew applications bring to your Nintendo Switch.
