When setting up my quadcopter after downloading the 3.1 firmware when the MavLink connects it hangs up on RC6_TRIM and says bad compass, I replaced the u-blox GPS with Compass with a new one and still get the same message, wizard will not complete. Red light is on the module.
@hardinfarms,
Sounds like your APM2.5/2.6 may have a bad 3.3vdc regulator.
Check this link here: http://www.diydrones.com/forum/topics/ac3-1-rc5-spi-speed-problem
Regards,
TCIII GM