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Source firmware code for UM2X dual extruder?

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Posted · Source firmware code for UM2X dual extruder?

I have a dual extruder upgrade on my 2X and have found firmware code (compiled) in the Cura director for dual extruder BUT it's got the left extruder motor going backwards as I have done the extruder upgrade. I am trying to find the source code for this but can't seem to and am not sure how to edit the compiled "hex" version.

Also, what "board type" is used in the Arduino IDE when uploading firmware to the UM2?

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