Edge101- DFR0886 Can not select board in Arduino IDE

Recently purchased a few units of Edge101 (DFR0886) and I am having trouble in selecting the board in Arduino IDE software.

I have installed the board as per product wiki steps No1-2-3- No4 (Step 4: In the search box, type "Edge101", locate the package shown below, and click Install. Wait for the download to complete, then click Close.) - all succeeded.

but when trying to select the board (Step 5: Finally, set the board to "Edge101 IOT Controller" by selecting Tools -> DFRobot Edge101 -> Edge101 IOT Controller.) although I can see the board , it doesn't select it !

Board is connected through USB ,LAN and also powered by 24Vdc.

Any help will be appreciated. 

Thank you!