Thank you for your prompt reply.
I have a brand new FMB920 and FMB003 in hand, both seem doesn't work with the USB cable.
And the cable works with my other devices. please see the following installed driver:
In addition, do Teltonika devices only work with the USB cable provided by Teltonika? Can i use universal USB-to-Serial Cable instead?
Thank you very much for your support.
Sonny