How to solve V2018.12 BMW E/F Scanner II "Adapter not found" Error

Problem: 
My BMW E/F scanner II (BMW Explorer clone) runs ok before, today it suddenly gave me error "Adapter not found". How can i solve this problem?

Error cause:
Enable network connection and it is locked.


Solution:
If you have this error, you need send back main unit for repair.
Disconnect Network connection before using the V2018.12 BMW E/F scanner. Otherwise will be locked.