"Hi, I had the same problem ever best and simplest is under ubuntu to flash with apm planner.
just plug in flash process start and important if you do not want the USB pull but push the reset button the rest kinds Pixhawk "
"I post a log and photos from my copter when i @ home.
The gps modul is on a tower than comes the level only with pixhawk than comes gfk under this the battery and power modul than comes gfk and under this is the power distributor. All my flights…"
"Hi, i fly 2 weeks on 3.3 RC 7 all is great but the pixhawk overwrite the m8n config and i must wait 10 minutes for hdop under 2,3 with 3.2 i wait at same day 10 minutes earlier 3 minutes for hdop under 1,8.