I have installed the upgrade board without a problem, and am in the process of installing the Zenmuse gimbal. When following the instructions exactly, the 8 conductor wire is about 1.5 inches too short to reach from the board through the recommended hole to the gimbal connector. My wire is about 6.75 inches (17 cm) long. Has anybody else had that problem? How long is the 8 conductor wire when you have no problem? Never mind. I found a longer wire among the stuff I didn't think I would need because I had done the upgrade. The wire I did use must be for some other quadcopter because there does not seem to be a use for it with the Phantom.