Reference: https://en.m.wikipedia.org/wiki/Roku#Feature_comparison
Per the above Wikipedia chart, the Roku 2450 is an old unit, released in 2012. It Is not listed as having dual band wifi capability. Single band units are 2.4 Ghz only and cannot connect to 5 Ghz wifi.
Roku Community Streaming Expert
I am not a Roku employee, only a user like you.
Streaming Stick+ 3810 | TCL Roku TV 43S245/C107X | Streaming Stick 3600
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