I recently purchased an APM2 and have been trying to upload the latest firmware to it. When I do, I get this error:
Upload succeeded but verify failed: exp C got 14 at 0
I've had the same problem using 3 different USB cables and on 2 different computers. I've double checked that the USB baud rate is 115200. I'm running Mission Planner 1.2.11mav 1.0 and trying to upload ArduCopter V2.7.3 Quad (I have the same problem loading any of the configurations). I'm running on Windows 7 Home Premium. The board has V2.4 silkscreened onto it.
I have a second APM2 which I can update without any problems using the same configuration.
Any idea how I can get this board updated properly? Seems like a hardware problem to me.
I've posted this problem on the Mission Planner forum about a month ago and haven't had any responses so I thought I'd try here.
I also sent e-mail to 3DR support twice (once a month ago and again yesterday) and haven't heard back.