That's because the Express and Premier models are bottom of the line bargain models that do not have dual band wifi receivers. They cannot receive the 5GHz band, only the 2.4GHz band.
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I am not a Roku employee, only a user like you. Please, no support questions via private message -- post them publicly to the Community where others may benefit as well.
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Streaming Stick 4K+ 3821 | Streaming Stick+ 3810 | TCL Roku TV 43S245/C107X
