It is my first multirotor & I was excited about it. Because I had no experience of multis I ordered plug n play ATG L 600 X4 from foxtechfpv.com. It is a combo of frame from ATG & DJI NAZA with GPS. After getting it I installed radio & setup everything as per so many instructional videos on youtube and DJI manual.

Everything was fine, NAZA versatile unit locked GPS & LED was blinking green means everything is OK. I armed the motors & pushed the throttle slowly. It became light on its legs & tried to lift off but was drifting slightly. I pushed the throttle some more & it flipped from backward right to forward left, motors stopped spinning & backward right prop broke.

What may be the problem?

I seek help from experts here.

Thanks.