Unable to use USB to Ethernet IOT card

Hi,

I had tried to configure the mangOH as cellular gateway following here.

I wanted to create a gateway between the ethernet IoT slot (eth0) and the cellular interface (rmnet_data0).
As I didnot find the eth0 interface. By mistake I have given ecm0 instead of eth0 during ./cfg_gateway.sh

Now I am not able to get the 192.168.2.2 . so I am not able to ssh to the wp7608.

Any help in reverting this changes to get back the interface?
how to get the eth0 interface as outlined here ?