[Help] MacOS Mojave unable to detect Bluno Beetle SW1.97

Hi all,

I've ordered 3 Bluno Beetle. I've tried the following with the 3 of them :
- pluging in with a microUSB cable to my MacBookAir (through a usb to usb-c hub)
- opening arduino ide, going to Tools->Ports : in this menu, there's usually a "usbmodem" choice when I plug an Arduino UNO. There is none.

So the Bluno Beetle is not detected through USB.

With the Android App "Light Blue" I can connect to it through Bluetooth. I can read the GATT properties (that's how I know the firmware/software version).

Help please

More info on my setup :
- MBA 2018 Mojave 10.14.2
- On the Bluno Beetle box : "New/DFR0339 Made in China Bluno Beetle"
- Bluno software / firmware revisoin string are both V1.97

Regards