I recently picked up a qr1 and am having issues with it. I've flown in the past but am by no means an expert.

Here is the issue. All batteries are charged (in the copter and controller). I plug everything in.. set it on a flat surface... I slowly move the throttle stick on the left upwards and it immediately flips over... Only 2 rotors seem to be spinning and its as if there is no inbetween on power.. its either full speed or off.

Ive tried resetting the controller to default.. different batteries, etc.

Any idea as to what is causing this?