Just purchased a ready-to-fly 3DR Hexa-C and installed drivers, downloaded and installed MissionPlanner-1.2.48 software. Followed instructions to uploaded 2.9.1b firmware first before even thinking of selecting Connect button.
Oh ya, I also verified correct Com Port, and bits per sec (115200) for both the com port and mission Planner. The problem I see at or near the end of Read Hex File is a alert window "Communication Error-No Connection".
At this point I have swapped USB cables 3x, uninstalled and installed MissionPlanner-1.2.46, even uninstalled USB driver "Arduino Mega 2560" and installed arduino-1.0.4's driver.
Lastly, I opened the Mission Planner software and selected "Terminal" I observed "com port open" but was not able to send commands to module.
This was test on both my laptops (one I'm typing on is a Windows 7 laptop, the other was my Windows 8 laptop with driver signatures turned off.
What in the world am I doing wrong! This should be this difficult. Help!