If you're looking to upgrade the power supply, it's the green one in this link.
Verizon FIOS G3100 router
Anyone know what size the DC barrel/plug is for this router? It appears to be proprietary because it slightly off from standard sizes. If my memory serves me, plug is larger than 2.5 & smaller than 2.8. One person suggested crimping the barrel gently to make it conform. Much rather do it right or not at all.