I tried the 2.4 with the above suggestions and it still didn’t work. What I did was use my old router connected to the new router through a network cable and it works. Not ideal but it’s a work around until I figure out what the fix is. I contacted customer support at T-Mobile and they pointed their finger at Vizio and said it’s the TV’s problem not T-Mobiles router. I wasn’t impressed with their customer service.
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