Hello, I do this sequence: 1) start assistant 2) plug USB cable from phantom to PC 3) power on phantom ( Range extender, Tx, phantom ) I have P2V 4) do your thing ( whatever you need to do in assistant ) 5) power off phantom, do not unhook yet! 6) power on phantom ( DOUBLE CHECK EVERYTHING ) when all is good 7) power off phantom 8) unhook cable ( both ends ) 9) turn off PC 10) FRESH compass calibration 11) go fly ( it is also good to perform Tx calibration while in assistant If you do any changes to phantom ) your choice on this part! Some DO, some DONT! Take care, fly safe ( it is said to NEVER hook or unhook any cables While phantom is ON! ) Edited for spelling correction!