Did you end up finding a solution to this error as I am getting it as well?
Here is a screen shot of my windows device manager showing the FTDI cable as a COM port.
My configuration is Windows 7, Arduino 0027, Ardupilot 2.7.1.
Screen shot of the Arduino error:
I have successfully loaded and flown Ardupilot 2.4 a few months ago and wish to upgrade to 2.7.
Have you got any other ideas as to what I can try as I have run through all the debug stuff I can find on this site.
Thanks for your help.
I'm facing ssame problem rigth now. Seems like software issue on my desktop computer.Working well on laptop...
if it's telling you a 30720 byte maximum, you have the wrong board selected in Arduino.
Also note that this is an incredibly old thread that dates back to a very old ardupilot. It probably doesn't apply to your hardware...