Hi Bruce,

The Windows DFU tool does not allow parallel processing.

However, if you sign an NDA (Our NDA is under Support/Documents at https://www.iot747.com/download/iot747-standard-nda-form/), we can share the source code of the python script that does the DFY over UART. Usually we share with customers so they can integrate on their host processor. But in your case, you can run it on your laptop and modify it to use mmultiple UART and do parallel upgrades.

IOT747 Support