Navigate to the official ArduPilot firmware archive (firmware.ardupilot.org). Path:
/ArduCopter/stable-3.2.4/
Look for: ArduCopter-v3.2.4-px4-v2.px4 (Note: The ".px4" extension is the binary file for Pixhawk, despite being ArduCopter). pixhawk 248 firmware
Do not use the "hex" file unless you are using a bootloader recovery tool. Ensure the "Standard" version is selected (unless you
Because 248 uses a different EKF structure, calibrate in this order: Flash: Click Flash
There are two main firmware options. You must choose one: