This procedure is the same for the MMU3 and MMU2S units running firmware 3.0.0 or newer. In case you are running MMU2S with older FW, please go to Factory reset (MMU2S pre firmware 1.0.6).
When upgrading the MMU2S firmware from firmware 1.0.6 (or lower) to 3.0.0 (or higher), or when you find a severe issue with the MMU, you might need to perform a factory reset.
- On the MMU unit, hold the left side button and reset the unit by pushing the button on the right side of the MMU with an Allen key.
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- Keep the left side button pressed for a few seconds. You will see the LEDs on the MMU flashing quickly in a "snake" motion.
- Release the MMU left-side button. As soon as you release it, the MMU EEPROM will be cleared and overwritten with factory default values and will do the selftest.
You have successfully reset the MMU. No indication will be shown on the MMU or on the printer.
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Nicolas Duarte
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This did not work as described. I had a BSOD and had to hold the button combination on the MMU while powering up (press and hold before the startup progress bar went past the 50% point). After that I was able to pass the BSOD. I did the button combination again and was able to re-flash the firmware, however the main MMU LEDs did not flash in a "snake" motion. There was flashing inside the box but it was not visible as a snake motion and only seemed to restart the MMU (it performed the same motions as it does on proper startup).