"We're still struggling with this rig.  We've put a brand new APM 2.5 board in it, thinking it was a gyro or accelerometer or chip problem.  The firmware has been reloaded/reset 20 times, brand new manually calibrated ESCs...  The data from mission…"

"I think I'm having the same problem with an APM1 board....  I'm thinking ours is more like 15 degrees off

Do gyros go bad often?"

"We have used a tachometer to read all the engines while running and when enough throttle is applied for the unit to lift we're getting ~43k RPM on the front 3 Motors, and ~55k on the rear 3 motors... 

Is this a firmware problem?  PID?  Any help…"

"Alright everyone, seems like a factory reset fixed the problems.  For anyone who doesn't know how to do this, click on terminal, and get a CLI prompt.  Then type "setup" then then type "reset", and type Y for confirmation.  After waiting about 5…"

"The process for downgrading the firmware seems a bit scary, but I'm pretty sure it's a firmware problem, can anyone confirm a working hexa+ with 2.6 firmware?"