| Symptom | Likely cause | Fix |
|---|---|---|
| No motor spins in motor test | ESC cable reversed or on the wrong output row; protocol not set | Check ground is on the − row, the outputs are set to DShot300, and motors 1–4 are on AUX 1–4 (Step 3) |
| One motor spins the wrong way | Bullet order on that arm | Swap any two of its three bullets |
| Ground station won't connect over the radio | Wrong COM port or baud rate | Connect on the ground radio's COM port at 57600; check the air radio is on the flight controller's telemetry port |
| Flow quality or rangefinder reads zero | Port or protocol not set, or sensor not prepared | Recheck the Step 10 flow table, then reboot |
| Aircraft drifts or speeds up in a flow mode | Flow orientation wrong | Land. Redo the flow check in Step 10 and correct the flow-rotation parameter |
| Prop wobbles on the shaft | Adapter ring missing or not seated | Press the adapter ring fully into the hub |
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