3D Robotics Pixhawk Autopilot - Manual (Page 7)

When prompted, follow the directions to load the firmware. Once the status bar shows that the download is
complete, power cycle the board by disconnecting and reconnecting the USB.
If you hear a musical tone, your firmware installation is complete. If you hear a series of tones followed by three
beeps, disconnect the USB and reconnect while holding down the safety button. Upon restart, listen for a series
of tones followed by two beeps indicating that your firmware has loaded successfully.
beep BEEP beep...
BEEP BEEP 
Pixhawk needs your attention:
beep BEEP beep... BEEP BEEP BEEP
Everything is OK:
musical tone

Select Initial Setup, Install Firmware , and select your vehicle.
CALIBRATE
With Pixhawk connected to your computer, select the communication option from the drop-down menu for
PX4 FMU , set the rate to 115200 , and select the Connect icon. Select Initial Setup and Mandatory Hardware to
access the calibration wizards.
Remove propellers before performing calibration.
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