14.1.1.3.5.1. 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. To enter the bootloader, just plug the camera in: it listens briefly at power-up, and -w makes dfu-util wait for it 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