On Mon, Jun 2, 2025 at 3:19 AM Bruce Doan wrote:

I am running DFU-util -d with my vid and pid for my device as parameters.

The response is that the device is in runtime mode.

I am not sure I understand, can you please post the full command line and output?

When I use the update utility supplied by the chip manufacturer, the device programs and restarts (as per code in the bootloader)

I cannot change the USB enumeration details at this point since too many devices have been deployed with existing bootloader code.

How can I “fake out” DFU-util to accept a Vid/pid match and run the update?

Is is this a device with DFU-mode and runtime-mode or is it always in DFU-mode and reports run-time mode?

I am unsure what the connection with VID/PID is here. Can you try without -d VID:PID? The -d option only serves to filter out any other DFU devices and make sure that the right device will be used. It is possible to filter on DFU mode descriptors and/or run-time descriptors.

Tormod