Now it is time to solder the new arm and reassemble the drone.

When soldering, pay attention to the colors of the wires. You can use my image as a reference. Alternatively, DJI has printed small letters on the PCB to indicate which wire goes where. All of the wires are unique in color so it should be easy to distinguish between them.

Don't forget to reconnect the antenna cable. It should be easy. Just put the cable back through the same hole it came out of; then press the connector into place. It should be secure and completely flat when seated correctly.

At this point, you should be done. You can completely re-assemble the drone. However, I recommend testing it prior to re-assembly. This can be done by just inserting a battery into the connector as shown in the 2nd image. Once it is inserted, ensure no propellers are attached; then arm the drone and run the motors.

If you get an error code: it is most likely due to your soldering. Double check that your solders are good, wires are where they are supposed to be, no 2 solders are touching, etc.