M1 and M3 motors are not working on launching

[kote]

I assembled the quadcopter following the instructions and now I tried to turn it on see if it's working. I can see that 2 blue lights are on, the green light blinked 5 times and red light blinks 2hz. According to instructions, it means the quancopter passed the test and is ready to fly. However, I've noticed only 2 out of 4 motors spin on launch and I am not sure why other 2 are not working. Can it be the problem with soldering?

[marcus]

HI,

Could you please check so you haven't attached the propellers too tightly onto the motors?

Could you please try the following?

• Fully charge the Crazyflie 2.0 using USB
• Unplug the Crazyflie 2.0 and turn it off
• Place the Crazyflie 2.0 on a stable surface that is level and power it on
• All four motors should now spin, one after the other one (like this

)