Sometimes you can broke arms on your FPV Multirotor Eachine Racer 250.
See my video to see how to break and replace arms on your Eachine Racer 250.
You can buy replacements arms here
http://www.banggood.com/Eachine-Racer-250-RC-Drone-Spare-Part-Frame-Arm-Black-Or-Red-p-1007086.html?p=HM3106075425201208YAincorporato da Embedded Video
To avoid unsolder ESC from PBD you can leave wires outside the arm.