Hi everyone. I have an issue with a Zenmuse H3-2D. As soon as it gets powered it starts acting crazy. Really crazy. Basically it starts shaking violently, up and down, for a few seconds. After a few seconds, it calms down then it does it again. There is also no balance. See this quite similar video which I borrowed from another member (thanks Brad by the way) : To do some testing I attached another H3-2D. No problem at all with this other unit but there is one difference between the two. See pictures attached. IMU firmware is 1.8 on the crazy gimbal and 1.2 on good gimbal. Same bootloader, same phantom (a P2), same 8 pin cable, same Gopro (a H3+ Black). No other difference. I suspect the 1.8 firmware is the issue but I have no way to be 100% sure. I am not the first owner and the history is not certain. There is also no more warranty. I have of course immediately tried to downgrade from 1.8 to 1.2 but no luck. Any version of the Zenmuse Assistant software*, any version of the Phantom Assistant software I use, it is always the same message, no upgrade available. * In this case I connect the gimbal to the GCU I received with the Zenmuse and this using the 8 pin cable, the GCU is powered by a 3S battery and the GCU is connected to my PC using a micro-USB cable. Weird thing is that I cannot make the good gimbal to update to 1.8. No way. Would be risky if problem comes from firmware and there is no way to downgrade but with this other unit, no way to upgrade any higher. A few notes : 1) the shortcut pins trick will not work because this is not a H3-3D but a H3-2D. 2) I have no issue with X1 calibration at all. As I said above, the other H3-2D works fine. Is there a tool to dump the firmware from the right unit and to force upload it to the wrong unit? Is there a way to force downgrade? Is there a way to force a hard reset? Any other idea gentlemen? This is really frustrating. Thank you in advance.