15.4.1.3.5.1. OpenMV STM32 cameras: dfu-util

For scripted or CI flashing of the single-core STM32 OpenMV cameras (M4, M7, H7, H7 Plus, Pure Thermal, N6), use dfu-util directly. It is included in the OpenMV SDK and in OpenMV IDE’s tool directory. On Linux, non-root access to the DFU device requires udev rules: install OpenMV IDE (which installs them), or copy its 99-openmv*.rules files from share/qtcreator/pydfu/ into /etc/udev/rules.d/ and run sudo udevadm control --reload-rules && sudo udevadm trigger. Otherwise run dfu-util with sudo.

These cameras use the openmv_dfu bootloader and are flashed by DFU alt setting (-a N), not by absolute address – the bootloader maps each alt to the correct flash region. -w makes dfu-util wait for the device to appear; --reset on the final transfer reboots the camera into the new firmware.

Camera (TARGET)	App VID:PID	DFU VID:PID	Firmware command	ROMFS command
OpenMV Cam M4 (OPENMV2)	37C5:1202	37C5:9202	-a 2 -D firmware.bin	-a 3 -D romfs0.img
OpenMV Cam M7 (OPENMV3)	37C5:1203	37C5:9203	-a 2 -D firmware.bin	-a 3 -D romfs0.img
OpenMV Cam H7 (OPENMV4)	37C5:1204	37C5:9204	-a 2 -D firmware.bin	-a 3 -D romfs0.img
OpenMV Cam H7 Plus (OPENMV4P)	37C5:124A	37C5:924A	-a 2 -D firmware.bin	-a 4 -D romfs0.img
OpenMV Pure Thermal (OPENMVPT)	37C5:1205	37C5:9205	-a 2 -D firmware.bin	-a 4 -D romfs0.img
OpenMV Cam N6 (OPENMV_N6)	37C5:1206	37C5:9206	-a 1 -D firmware.bin	-a 3 -D romfs0.img

Flash the OpenMV Cam H7, firmware then ROMFS:

dfu-util -w -d ,37C5:9204 -a 2 -D build/OPENMV4/bin/firmware.bin
dfu-util -w -d ,37C5:9204 -a 3 --reset -D build/OPENMV4/bin/romfs0.img