I have a couple of these combos laying around and I am looking into modding them so I can use 4s lipos.
I am going to try to force flash mmp firmware to the et-3s via sylabs software and a sylabs usb toolstick. Heli guys have been flashing custom firmware to castle esc's for a while now, and I dont see why I cant apply similar proceedure to the et-3s. Plan is to pickup an mmp this week for granular comparison. I need to first make sure they are in fact indentical, or close enough that it wont explode. If not, I am not capable of writing custom firmware and this venture will die here.
Is there a way to get a hold of a stand alone firmware file for the mmp? Worst case scenario, I plan on buying another mmp this week anyway and can dump the firmware myself.