Flashing custom firmware (MINI/MINI+)

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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.

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 seal on the Buddy board and move the jumper in the correct position. 

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.

4. 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.