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Unable to find correct firmware for my machine in Cura folders

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Hey guys, I just built a new UMO+, upgraded it with the UM2+ extrusion kit, and now I need to load custom firmware.

I was reading another forum post on this in which the user was told to place the custom firmware inside the Cura folder and replace the old firmware .hex file (while saving the old file, of course).

I can't seem to find which file is mine. There are quite a few listed, and none of them match what it says on my Ulticontroller. How can I find the correct file to replace? Or, should I just remove all the firmware .hex files, and place my custom file in the folder by itself?

Any ideas?

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