A friend bought a used qr x350 pro with a devo 10 and asked me for help. I tried a lot of things but unable to get this thing armed/ unlock motors. X350 users if any can help.

could you be specific in terms of ..how the lights blink before and after you do the calibration, unlock..
if it aint unlocking ...make sure that
1) your Directions of throttle, rudder, elevator, aileron are set up in the right direction from the radio.(hope they are not reversed)
2) check the battery

I think the settings are wrong on the devo 10, the battery is good, the T R E A are not in reverse position.

When the left LED stops blinking i pull the throttle stick to extreme left bottom to arm the motors, nothing happens. i tried adjusting the trim but still no luck.

also check all the other buttons on the devo are in 0 position..gear stick, fmod etc

for details visit channel helipal on youtube