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Help Galaxy s5 wifi stopped working?

I just got the s5 like 3 hours ago.
And now I'm using it on my wifi.
I got a wifi analyzer app, and it said my recommended wifi channel is 14(2.484GHz)
So i went on my router and switched it to channel 14.
Wifi is working on every other device, but now on the s5 it says my wifi network isn't in range.
Does that mean it can't find networks on that frequency?
How do I know what frequencies will work?

http://www.phonearena.com/phones/Samsung-Galaxy-S5_id8202
Do those specs tell me what wifi channels will work?
I thought it would be GSM but none of those frequencies are what my router match so that's not true because my wifi worked before.
I'm just curious why it won't pick up my wifi when I changed it to that channel.
 

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