File system error #26613 (MK4S) #13613 (MK4) #21613 (MK3.9) #23613 (MK3.5)

Relevant for:

MK4 MK3.9 MK3.5 MK4S

Last updated 4 months ago

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What happened?

While flashing firmware to your Original Prusa MK4, MK3.9, or MK3.5 an error might occur, and the screen will display the following message: "File system error! Try a different USB drive or format the drive with FAT32 filesystem (all data will be lost)".

Error name: File system error

Error code: #26613 (MK4S) #13613 (MK4) #21613 (MK3.9) #23613 (MK3.5)

The printer shows this error when it can't read the USB drive.

How to fix it?

Connect the USB drive to your computer and format it in FAT32. After formatting the USB drive, try flashing the firmware again.

Are you still having issues? Contact our support team and let them know that you tried to fix the issue with these instructions. We will take it from there.

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