"If pixhawk uses same configuration on wiki page (link) , gps doesnt accept some commands on that config file. You have to do it manually with u-center.
I explained here"

"Thanks Randy,
Normally im using anti vibration foam (http://goo.gl/xFg2MD), but i will change with rubber. Hope it give better results. Also increasing thickness of plates. They will instantly break when touching to ground. Frame with acrylic plates…"

"I think crippling came from landing. after 10 or 20 secs (not remember well) takeoff, landed for adjusting throttle hover slider. In my opinion; vibration is not the main problem. Also yes, i cant find any info about err19.

If its barometric issue…"

"Thanks for the answer, logs also have disarmed logs. During the flight one prop sliced receiver antenna so i landed for check. But still althold mode altitude drift. My copter still lost altitude but giving more throttle overrides. On previous…"

"I have smiliar setup with pixhawk (multistar 268kv motors, afro 20a hv esc's and 6s battery, quad config). I dont have sync issues but every flight is nightmare for me. Some moments it flies well, some moments it gives only headache, and nobody…"

"Hello,

Normally my copter flies well but after installing 3.3rc7 it started to give bad ahrs error (hud started to move randomly) and an unusual tone (like simonk fw esc's first start tone). Sorry i dont have logs because of cant fly it and didnt…"