Firmware Frustrations

I cant seem to install the firmware to a mega 2560. it is an emergency replacement for one i bought from here. i just cant seem to get it to work.

mp3dp/ mpcnc with extruder - hooked up to usb to computer. arduino seems to recognize code errors in the b16-32-lcd-112515 and marlin_16_32_090615_therm loads but fatally errors out.

is there a specific version of this i need or a specific verison of arduino? ive never flashed before so im trying my best.

also its the 5/16th treaded rod not the 8mm

Any help would be wonderful thanks

Updating the instructions now, give me a few minutes.

Try my updated instructions and let me know.

Sorry it took so long. The instructions were PERFECT!!!. uploaded just fine.