What is your mode switch set to? It should be set to atti, gps and manual. I had mine set to atti, gps and failsafe and it wouldn't go into calibration.
HI I have flicked the switch 6-10 times, but no blue light.
I have tried moving both switches.
Can any tell me the way they calibrate their unit? How you start.
double check in assistant software that the flight modes are moving from Manual Atti Gps and all lighting blue in the software .
That is normally cause of being unable to calibrate compass .
But you have already a few flights under your belt with this machine so you must have calibrated it once before .