Hello I have bought SP F3 mini, today evening time I flashed the board under default specs, after successful installation i disconnect the device and connected back on again. everything seems to be work fine in clean flight, but once i attached the battery Li-po 4S 14.8v 4250 Mah, the board went dead, i thought there was some usb port problems, so i restart my pc and connect the board again, but no lights was appearing, and board was heating up so quick. only one light was ON on the right hand side next to the power pins. Is the board DEAD ??? or what can i do about it.