ADB connection with USB issue

NNGUXATLAS

Hello Dear Technical Support!

We recently ( in the past month ) bught a Firefly-RK3399  development board ( http://shop.t-firefly.com/goods.php?id=45 ).
The device came with Android 7.1.1 OS on it and we wanted to use it through the Type-C usb connection as well – since adb over network can be unreliable as it disconnects within 20-30 minute on its own even though we got a stable ethernet connection up and running on the device.

The issue is that the device does not recognise the computer when connected to it ( We’ve tried connecting them through the provided Type-C cable without any luck ), charging over usb won’t show up either on the android notification bar, and we don’t see the device – not even as unrecognized – in the computer’s device manager or file explorer. The PC is running Windows 10, maybe this can also be an issue.
We would like to ask for your help in finding the solution to this problem – and if you have an idea why the firefly disconnects in 20 minutes after network connection to PC we’d be glad to know that too.
Below are the details of the firefly-RK3399 device and the steps taken / tried to make it work :
Firelfy-RK3399 specification :
•        Android 7.1.1 OS
•        Android Security patch level : February 5, 2017
•        Kernel version : 4.4.55 – omy@tchipserver2 #41 – Wed Jan 17 18:03:05 CST 2018
•        Build number : rk3399_firefly_box-userdebug 7.1.1 NMF26X eng.omy.20180117.180817 test-keys
•        Serial and IMEI number is unkown...

Steps Taken :
•        Tried connecting via other Type-C cable
•        Tried connecting through other USB port ( namely the USB 3.0 ) with a male-male USB cable
•        Installed supposed USB Driver for the device   - http://en.t-firefly.com/doc/download/3.html under Tools : DriverAssistant_v4.5
•        Reading through the wiki we tried Finding the Settings->USB->Connect to Pc option but we didn’t find the USB subcategory within settings

Looking forward to your answer,