HomeBrandsPrusaFDM 3D Printers10101
P
10101
Moderate
Prusa · FDM 3D Printers
Firmware Update Failed - Flash Process Did Not Complete
Quick Answer
Error code 10101 on your Prusa FDM 3D Printers means: Firmware Update Failed - Flash Process Did Not Complete. This is usually fixable — see the step-by-step guide below.
Affected Models
Applies to all models
MINI+MK3.5MK3S+MK4MK4SXL
Likely Causes
  1. USB drive was removed during the firmware flashing process
  2. USB drive filesystem is incompatible (must be FAT32 formatted)
  3. Firmware file is corrupted or incomplete download
  4. Incompatible firmware version for the printer hardware revision
  5. Power interruption during firmware flash
How to Fix It
1
Download the firmware file again from prusa.io and verify the file size matches the expected size
2
Format the USB drive as FAT32 and copy only the firmware file to the root directory
3
Ensure the printer is connected to a reliable power source during the update
4
Restart the printer and retry the firmware update process
5
If the printer is bricked, use the emergency firmware flash procedure via the USB-DFU bootloader (hold the reset button while powering on)
Pro Tip
This fix requires some technical knowledge. If you're unsure about any step, consider contacting support or a qualified technician.
Parts You May Need
USB flash drive (FAT32 formatted, under 16GB recommended)
USB-A to Micro-USB cable (for emergency DFU recovery if needed)
Related Error Codes
1220112202122031221112212
Video Guides
Loading video guides…
Search more on YouTube →