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Flashing custom firmware MINI

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Last updated a year ago
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Every firmware version goes through intense testing to verify that every single feature works as it should. That applies especially to the safety features: for example, if the thermistor readings are outside the limits, the heating stops automatically.

We cannot guarantee the functionality of the safety features in a community-made or custom-modified firmware.

Official firmware is signed with a private key and the printer verifies the validity of this signature before it allows a firmware update.

To flash your own (or a community-made) unsigned firmware, you’ll have to break the appendix on the logic board (called the Buddy board) and move the jumper in a correct position. Breaking the appendix on the Buddy board is irreversible and voids the warranty of your printer’s electronics.

  1. Turn off and unplug the printer.
  2. Pull out the power switch to access the appendix (1).
  3. Take a small thin screwdriver, insert it into the long hole furthest from the wall of the case, and carefully remove the middle part.

  1. Check the three pins above it - there must be a black jumper on the two pins that are closer to the center of the board.
Some revisions of the board will only have two pins for the jumper. You will then not need the jumper at all! Only break the appendix to flash unsigned firmware. A jumper on these pins can even prohibit the firmware from being updated.
If you break the appendix, you void your warranty and we disclaim responsibility for any possible damage done to the printer and/or its surroundings (e.g. in case of a fire).
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