Once the driver is active on COM port X, you can use tools like or fh_loader to interact with the hardware.
The part adds extra quirks: sometimes the EDL port appears as 05C6:900E instead of 9008 on early QRD samples. Also, the diag port may require a special qcdm driver because the modem uses a different transport layer. sdm439-qrd usb driver
%QC_VID% & PID_9008 ; QDLoader 9008 %QC_VID% & PID_9091 & MI_00 ; QRD SDM439 MTP %QC_VID% & PID_9025 & MI_01 ; QRD SDM439 Diag port Once the driver is active on COM port