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I finally got it working. I put the XB8 into bridge mode and confirmed that I was getting internet directly connected via ethernet to the xb8 in bridge mode. I connected the XR1000 after that and the XR was still not speaking with the modem. I then unplugged the XB8 and kept it unplugged for about 10 minutes. I powered the XB8 back on, keeping the XR1000 still plugged in. I waited maybe another 5 minutes, they still did not speak to each other. Then I powered off the XR1000, unplugged it for a minute or two. Plugged back in and then finally got the white internet light.

I've put it into bridge mode myself. It's a basic toggle in the modem dashboard. It just doesn't talk to the xr1000 after that. And again, the previous modem I didn't have any issues with. Put it into bridge mode, connected the router, everything worked. And this is all within the last 2 weeks. I ordered the xr1000 on 2/14/23. Ran without issues until I was told I could upgrade the modem to increase upload speeds. And now i'm stuck.

I just updated to the xb8 modem from Xfinity from the xb7. I had no issues setting things with the xb7, even though initial it didn't grab the isp info during the setup, somehow it went through. With the xb8, i've factory reset the modem several times and the xr1000 i've maybe factory reset 20 times now and it doesn't catch the ip address. I get 0.0.0.0 on the dashboard. The modem itself works. I've tested it and all is good on that end. Anyone run into something weird like this? I'm might exchange the modem to see if it's a random glitch. Otherwise, I'll likely need to return the router as I can't make any sense of this.