I'm relatively new to this stuff but found the following to be an easy way to modify them.

Mount the modem into a router and run the following commands to change the PID/VID
AT!ENTERCND=“A710”
AT!USBPID=9071,9070
AT!USBVID=1199
AT!USBPRODUCT=“EM7455”
AT!PRIID=“9904802”,“001.001”,“Generic”

Now you ...