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The new wireless standard on the TG3482G (802.11 ac), is backwards compatible with wireless 802.11 b, g, and n.
I do know that some devices have trouble finding the 2.4 Ghz band if it's the same name as the 5 Ghz band and you're trying to link up with a smartphone app to activate it. You can try changing the name of your 5 GHz band on the gateway to a different name than the 2.4 GHz band, connect your smartphone to the 2.4 GHz band, and see if your Aria can find it.
If not, then try talking to Fitbit customer support.