I re-uploaded the latest firmware, reset the settings. I bound the device to a new account opened on goodcloud and shared it with your account. Right now the router works in repeater mode, the modem is attached and detected (the records in the log) but cannot be seen in GL GUI.

But if you jump straight to

http://192.168.8.1/#/modemmanage

you will see that the modem is alive and connected:

The name of APN to use: h2g2, no authentication.