Attention: Please use the old driver method only if USBDriverInstaller.exe fails to work.
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USB Serial driver must be used, not the commonly used modem driver, attached is an old version of USB serial driver in this ticket "wmusbser.inf". After apply this one, new device should appears in the "Ports" section of device manager instead of "Modems".

Customer may try below steps to change the driver:
1. plug USB
2. at device manager, find and right click the USB Q2687 device (under MODEM)
3. click "Properties", go to driver tab
4. click "Update Driver"
5. select "Install from a list or specific location(Advanced)"
6. click "Don't search. I will choose the driver to install".
7. Click "Have Disk" and select folder which contants the .inf file
attached.
8. Click "Continue Anyway".
9. Click "Finish", the Q2687 USB should appear under "Ports" selection".