FX30(WP7607-1) eth0 missing, bricked?

From the user guide, there is a page showing how to do factory reset:

you can see here on how to erase the userapp partition:

You can also upgrade the firmware and see if there is any improvement:
https://source.sierrawireless.com/resources/airlink/software_downloads/fx30-firmware/fx30-firmware-cat1/#sthash.SZNpDhzT.dpbs