Just bought this to play with in the house, and straight out of the box the front left prop doesn’t spin up with throttle, it responds to gyro, so looks like a control board/mixing fault, where throttle mixing to this esc/channel isn’t working. Hopefully can get a quick replacement with no hassle.
UPDATE: Thanks for suggestion from agrs1974 to recalibrate gyros to relearn ‘level’ angle, I googled and found the instructions (not in manual see below – I had to waggle aileron 3 or 4 times before eyes flashed), and this resolves problem and X4 is flying fine now, both standard and expert mode with auto-flips.
Put quad on a level surface, like a table or floor you know is straight/level.
Power up and allow to bind.
Press and release right stick switch to put it into “Expert” mode (says Expert in tiny letters on LCD and red LED flashes)
Hold left stick to bottom right corner (care – no throttle as it is live)
While doing this waggle right stick left/right/left/right until “Eye” lights flash side to side to show calibration has been completed, and sensor has re-learned flat/level position!
You can also use this if the quad drifts in flight, just use a piece of thin card to prop up the side which drifts and recalibrate level, this may take a few tries, but works really well.
Same process works on Hubsan Nano quadcopter, so I’ve used this to get these to hover hands off as well.
Post time: Jul-17-2017