love the drone, made a mistake of placing a dead battery in and taking off really fast....battery lost voltage, h flew off and crashed. did some soldering on the cam, body replacement, receiver replacement with longer antennas?!??? gear, blades, led cables and motor arms ect.... GUI says everything looks great, everything calibrates fine... takes off, very unstable and twitchy, and will not land properly resulting in a tip over and blade strike. love the drone, i screwed up...any ideas ???