USB not connected #26602 (MK4S) #13602 (MK4) #21602 (MK3.9) #23602 (MK3.5)

Relevant for:

MK4 MK3.9 MK3.5 MK4S

Last updated 4 months ago

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What happened?

During firmware flashing on your Original Prusa MK4, MK3.9, or MK3.5, you might get the message "USB drive not connected! Please insert a USB drive with a valid firmware file".

Error name: USB not connected

Error code: #26602 (MK4S) #13602 (MK4) #21602 (MK3.9) #23602 (MK3.5)

This issue happens when there is an error reading the USB drive.

How to fix it?

Make sure that the USB drive is connected to the printer, and that the USB port in the mainboard is not damaged. If the error persists, try using a new, FAT32-formatted USB drive.

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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