Netgear modem not working with xfinity.

Yea, Same here I have Netgear r7500 and Netgear 16 ports it was working fine until Comcast modem fail. I went to comcast and got a new Xfinity xfi x86. but this new xfinity only has 2 LAN ports. I hung one to my computer and one to my Netgear switch it cuts off internet, and When i connect my netgear R7500 it does the same thing. And now with out my netgear switch working, My devices that are hard wire will not will not work. So, my 4 Dlink camera and 8 cameras for security, my external, 2 Access point devices, 6 computers no longer works. Unless you have a Wifi devices built in to you are devices. But like hard wired because it is more stable and reliable. I am think it is the firmware that I have to update on all my Netgear Products, but is not a guarantee it will work. And I sure hell don't want to spend $200-500 on a new device just because Comcast/Xfinity has a new product with up to date firm ware. it is so stupid, sorry I am frustrated. So,  yea...thanks Comcast, So, no I am thinking Century Link as my Ip service. And I can't update my Netgear products because It can't access in the internet.