Just finished the install on my P1. Also added the upgrade board (P330). The gimbal is getting power and is charging the GoPro, but is otherwise dead. I updated the Naza V2, MC and P330 via Assistant, all was good. Tried to update the GCU and IMU via the Gimbal Assistant... it's not seeing either one. Says they have to be connected. Well if the P330 in plugged into the laptop, then they are connected, right? I've seen mention of plugging in via the micro USB on the GCU, but no such cord was provided. Also under the impression that's only if using the stock board and a PMU. Any ideas or painfully obvious thing I'm missing? Surprise surprise, the DJI Wiki offers zero help. Hopefully I didn't get a DOA gimbal. Pretty sure I can even hear the motors running in the thing when power is on, but no ife other than charging the camera. Cheers.