Why would you want to do that? The FiOS WAN link is at best 300/65Mbs. A single GigE port has more than enough bandwidth to handle this. Redundancy is not an issue, as there is only one WAN link so a redundant LAN doesn't buy anything.
To answer your question, I've never heard or seen anything about Ethernet bonding support in the MI424WR routers. Bonding is something used by high end networks, and not typically found on a small office/home office router such as the MI424WR
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