Firmware recovery: Ultimaker S3 and Ultimaker S5

In certain cases, a complete reset of the Ultimaker S3 or Ultimaker S5 is necessary to resolve problems. For example, when the printer is failing to boot up correctly and the display is stuck on the Ultimaker logo.

When it is necessary to do a full reset, follow the instructions on this page to perform a firmware recovery. This page contains files and instructions for the Ultimaker S3 and the Ultimaker S5 'R2'.

Note: For the Ultimaker S5 'R1', or '2018-2020' model, there are potential safety hazards due to the open built-in power supply. If you need to perform a firmware recovery for an Ultimaker S5 'R1', first contact support or your local reseller to be informed about the extra safety precautions.

Caution: Always check local regulations. In some countries, such as Australia, only certified staff is allowed to remove the bottom cover for equipment with a built-in power supply. Contact support or your local reseller for further information.

Note: If your Ultimaker S3 or Ultimaker S5 'R2' has a USB dongle installed next to the mainboard (see image below), do not proceed. You will need different files. Contact Ultimaker support for further information.

No-dongle-Electronics.jpg Dongle-Electronics2.jpg

No USB dongle hardware. You can proceed with the firmware recovery instructions.


USB dongle hardware. Do not proceed and contact Ultimaker by submitting a ticket.


Getting started

Note: Always take ESD precautions when exposing the electronics at the bottom of the printer. Handling the electronics in an unsafe way can cause damage to the machine. Submit a support ticket or contact your local reseller if you do not have access to ESD precautions, such as an ESD bracelet.

To perform a firmware recovery for the Ultimaker S3 or Ultimaker S5 'R2', you need the following:

  • Hex screwdriver 2 mm
  • Supplies for working ESD safe
  • Micro SD card (1 GB minimum, 32 GB maximum) Warning: Will be erased
  • Computer with Micro SD card reader
  • Latest recovery image:

Ultimaker S3 recovery img 7.1.3


Ultimaker S5 'R2' recovery img 7.1.3


Prepare the SD card

Next, prepare the SD card with the firmware recovery image. You cannot just move the file to the card, but you need a disk imager tool. There are different processes for Windows and Mac:

Windows MacOS
  1. Connect your micro SD card to your computer.
  2. Download and install the Win32 disk imager tool:
  3. Open the Win32 disk imager tool.
  4. In Win32 Disk Imager Tool:
    • Select the file ‘um-restore-[version-number].img’.
    • Select your SD card drive number.
    • Press Write.
    • Wait for the process to finish completely.
  5. Safely remove the SD card from Windows.

Note: To restore the SD card after completing the firmware recovery, follow the steps below:

  1. Insert the SD card into the computer.
  2. Right-click it, and select Format.

Firmware recovery instructions

The recovery process consists of three steps:

  1. Removing the cover and inserting the SD card
  2. Recovery process
  3. Removing the SD card and reassembly

Insert the SD card

Power off Turn off the Ultimaker S3 or Ultimaker S5 using the power switch at the back and disconnect the power cable.
Remove bottom cover

Gently place the printer on its left side. Use the 2 mmm hex screwdriver to remove the bolts that secure the bottom cover.

Note: If the bottom cover contains a speaker, disconnect this from the mainboard.

Insert SD card

Insert the Micro SD card into the slot at the side of the mainboard, near the green SOM board:


Recovery process

With the SD card in place, reconnect the power cable and turn on the printer with the power switch at the back.

The firmware recovery begins automatically. Wait for the installation progress to be completed. The display of the printer will show Installation complete when it is finished.

Caution: Do not touch the electronics or power supply while the power cable is connected and the printer is powered on. Do not power off the printer or remove the power cable until the recovery process is complete.

Remove SD card and reassembly

After the recovery process is complete, the SD card must be removed from the printer again. Follow the steps below:

Power off After the installation has finished, turn off the printer again using the power switch at the back and disconnect the power cable.
Eject SD card

Push on the micro SD card to eject it from the slot in the mainboard.

Place cover

Align the bottom cover with the printer and secure it in place with the bolts using the 2 mm hex screwdriver.

Note: If the bottom cover contains a speaker, reconnect it to the mainboard first.

Place the printer upright

Carefully place the printer in its upright position again.

Factory settings

You can now reconnect the power cable and turn on the printer using the power switch at the back.

Please note that the firmware recovery has erased all settings, including those set by the factory. All the calibrations will need to be redone. Click the links for instructions:


You can also download the firmware recovery guide as a PDF:

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