We're trying to upgrade to version 17, but there are issues with Internet routing.
Even though the devices see each other and create a mesh network, Internet works only on the gateway router. We tried in meshes with wdr3500 and 4310 and got the same problem.
We got the binary images from here [1]. I also attached the output of "bmx6 -cp && bmx6 -cd8" in the gateway and in the other router as per Gui's suggestion.