What to expect when upgrading to fiber (AT&T)…

Been using Fiber for two years. No issue at all with any devices.

Thanks. Yes. All settings/passwords, etc. were simply transferred from the old box. I’m realizing that the Roku and other streaming devices are at least 3-5 years old, so replacing them is probably smart ( @ $50 ea, they are not too expensive and may have update internal hardware components that will make a big difference. The more research I do, I’m learning more. From the pole on my street to my tv screen, there are several components (boxes, wires, etc.) that may be weak links restricting performance just cause they are old. Thanks for your help!! Happy new year!!

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I’m realizing that the Roku and other streaming devices are at least 3-5 years old,

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They are still selling 2019 model Roku's, yours is probably fine.

Is the AT&T gateway the only router you're using?

Assuming the broadcasted name of your new router is the same you probably need to reboot your devices so they can log in and get their new ip addresses.

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I’m now getting error codes to unplug and replug in my HDMI cables going from the Roku stick to my 4k LG TVs.

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This has nothing to do with your Fiber

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That’s what we use and we also have Suddenlink. I can’t understand how 400mb Suddenlink is always much faster on Speedtest than AT&T fiber.

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If 400mb Suddenlink is "always much faster" than your 1G fiber service, you have your devices set up incorrectly. I generally get 700/700 over wifi, and I don't think I've gone below 450 anywhere in my house, under any conditions, ever.

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I generally get 700/700 over wifi, and I don't think I've gone below 450 anywhere in my house, under any conditions, ever.

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What kind of wifi router you using?

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What kind of wifi router you using?

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The newest version of the big white chunky thing ATT requires. Nothing special.

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It’s installed with a new modem/Wi-Fi router box. I’m now getting error codes to unplug and replug in my HDMI cables going from the Roku stick to my 4k LG TVs. Do I need to upgrade the HDMI cables to the 4k HDCP 2.2 cables now? What else do I need to upgrade? TIA…. Just want to make the most of the new band width for picture quality. Anyone else going/went through this?

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Sounds like a coincidence and not fiber related. roku has issues with this now and then. Unplug and re-plug cables can help. You might also try changing chroma from 4:2:0 to 4:2:2. By no logical reason should that make a difference but it does with some setups.