How to setup GRE tunnel with MTCBA-x-EN products and firmware version 1.14 or later
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Assuming you have the following setup:

192.168.1.x  ---  Edge modem #1 --- 65.122.33.1 --- internet --- 76.122.22.1 --- Edge modem #2 ---  192.168.0.x

Ethernet Edge modem 1:
- LAN = 192.168.1.x
- WAN = 65.122.33.1

Ethernet Edge modem 2:
- LAN = 192.168.0.x
- WAN = 76.122.22.1


Steps for setup Edge modem #1:
- webadmin into the ethernet modem
- click on Networks & Services
- add a network name = RemoteIP2 - 76.122.22.1 - 32
- add a network name = RemoteLAN2 - 192.168.0.0 - 24
- click on Packet filter rule
- add a new rule = LAN - Any - Any - Accept
- add a new rule = RemoteLAN2 - Any - Any - Accept
- click on GRE tunnels
- add a new tunnel = Test - WanInterface - RemoteIP2
- click on GRE routes
- add a new route = RemoteLAN2 - Test
- click on Save & Restart


Steps for setup Edge modem #2:
- webadmin into the ethernet modem
- click on Networks & Services
- add a network name = RemoteIP1 - 65.122.33.1 - 32
- add a network name = RemoteLAN1 - 192.168.1.0 - 24
- click on Packet filter rule
- add a new rule = LAN - Any - Any - Accept
- add a new rule = RemoteLAN1 - Any - Any - Accept
- click on GRE tunnels
- add a new tunnel = Test - WanInterface - RemoteIP1
- click on GRE routes
- add a new route = RemoteLAN1 - Test
- click on Save & Restart


To verify if the GRE tunnel is working :
- make sure both modems are on the internet and have assigned public static IP address
- from the local LAN, try pinging some device on the other side of the remote LAN.   You will need to specify a longer timeout option when performing ping due to the very slow wireless link.
- check GRE Statistics in Statistics & log to see if there are any data traffics on the GRE tunnel.