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Flashing Firmware

  1. Connect the 305ap to your PC via USB.
  2. Open QGroundControl.
  3. Go to Vehicle Setup → Firmware.
  4. Select PX4 Flight Stack and choose the stable release.
  5. QGroundControl will detect the board and flash automatically.
tip

If QGroundControl does not detect the board, try entering DFU mode manually (see below).

Via DFU (dfu-util)​

Enter DFU Mode​

The 305ap has a dedicated BOOT button on the board. To enter DFU mode:

  1. Hold the BOOT button.
  2. Apply power (or press and release RESET while already powered).
  3. Release the BOOT button. The board will enumerate as an STM32 DFU device.

Flash with dfu-util​

# Install dfu-util if needed
sudo apt install dfu-util    # Debian/Ubuntu
brew install dfu-util        # macOS

# Flash PX4 firmware
dfu-util -a 0 -s 0x08020000:leave -D avianautomata_305ap_default.bin
Flash address

0x08020000 is the PX4 application start address, located in sector 1 immediately after the 128 KB bootloader reservation.

Flash via STM32CubeProgrammer​

  1. Enter DFU mode as above.
  2. Open STM32CubeProgrammer.
  3. Select USB interface and connect.
  4. Set start address to 0x08020000.
  5. Browse to the .bin file and click Start Programming.

Via PX4 Bootloader (USB or Serial)​

If the PX4 bootloader is already installed:

  1. Power cycle the board. The bootloader waits 5 seconds for an upload request.
  2. Use QGroundControl or px_uploader.py to upload within that window.
python3 Tools/px_uploader.py --port /dev/ttyACM0 build/avianautomata_305ap_default/avianautomata_305ap_default.px4

Flashing the Bootloader​

If you need to re-flash the PX4 bootloader itself:

dfu-util -a 0 -s 0x08000000:leave -D avianautomata_305ap_bootloader.bin

The bootloader occupies sector 0 (0x08000000–0x0801FFFF, 128 KB). Flashing PX4 firmware does not overwrite the bootloader.