I powered three esc's to my transmitter. I made a mistake while binding the 4th one. Now the on switch on the top left works for the first three and the propellers rotate properly. The fourth one has reverse powering command. When I connect the fourth one alone to the Throttle slot on the receiver it rotates in proper direction but only after the on button is turned the other way. I tried several combinations to bind it the proper way. It refuses to take the correction. The fourth one needs to be set right to switch on like the other 3 when the on button is turned on. Please guide as to how to correct this anomaly. I have built the F450 x quad. KK215 controller with FSCT6B transmitter. It is funny. When I throw the switch on button only three rotate Fourth one begins to move only in the reverse order command. Any tips, tutorials on you tube to follow would be of great help. Thanks