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I bought a cheap chinese prusa i3 off of ebay last december and im trying to upgrade the hot end to an e3d v6 but i cant figure out how to change the firmware to work with the thermistor on the new hotend. The board is an arduino mega 2560 rev A. Ive tried uploading a bootloader with the arduino ide but it fails everytime even when i used an arduino uno as an isp for it. Does anyone have any ideas how to put a bootloader onto it and change the settings to make it work with my e3d v6 hotend?