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Can't find my 5GHz wifi with UE55RU7100WXXN - Samsung Community
Upgrade to Pie, Hotspot option 5ghz disappear - Samsung Community
S5 switches from 5GHz to 2.4GHz every 5 seconds - Android Forums at AndroidCentral.com
I cannot enable 5Ghz hotspot, and can't even change the channel for 2.4Ghz! - Samsung Community