Can anybody help? I built a 250 fpv quad. It's an emax nighthawk with 2204 2300kv motors and emax BLheli esc's. From the begining it acted starnge as to when I would plug in the main battery all of the esc's would not arm. If I would unplug and plug in again they would finally arm after a few times. Now I cannot get them to arm at all. I re-soldered the connections. I checked the wires with a meter, I'm getting power. I know its not the board (CC3D). I can take the leads from the 2 that do arm and switch them to the other outputs and they work fine. I did calibrate them and was able to set neutrals when I first set it up. I tried to re-calibrate them individually but when I power them they beep twice quickly, then nothing. I don't get any arming tones. It did take me a few times to calibrate them when I first set the quad up, maybe I screwed something there. But how can I get them to work again. What do I need to re-flash them and set them back to the default settings if that is the case and I changed something by accident? Any help would be greatly appreciated, getting really frustrated........