Netgear C7800 Modem/Router Issue: Upstream/Downstream Lights blinking

Hi there, 

Yesterday everything was working fine. Today my internet went out. After a very long time on the phone with comcast, they said everything was fine on their end (of course). So I contacted netgear (same story). A little digging around and I believe the current firmware actually causes my Modem/Router to have a bug and it is stuck in an endless "firmware upgrade" cycle. 

Does anyone know of any fixes? I found a video where the guy had the same problem on a different product and the way to fix it was to download the lastest firmware and try to manually reset everything. 

However with the Netgear C7800 all firmware is pushed by Comcast (my ISP) and I am unable to download the firmware. 

EDIT 1: I have tried every combination of reset possible. 1. Reset by unplugging the netgear. 2. comcast reset as is presented in the app. 3. factory reset as instructed by Netgear 4. all combinations of cable in/ cable not in. 

This is really frustrating and I hope someone can help me out. 

On my Modem/Router here are the status lights:

Power: Constant On

Upstream: Slow Blinking

Downstream: Slow Blinking in sync with the upstream light. 

Internet: Constant On but no connectivity

Please Help, I've lost an entire day of work and would not like to lose another.