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. 
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?
Please advise
Bruce Doan