Thank you for the help. I think it's just that my wifi adapter doesn't support 5GHZ, like Solla said.

Yes! My Iphone is able to detect the 5GHZ Wifi, i think my wifi adapter does not support 5GHZ. Question, what if i use an Ethernet cable? If i plug one in, will i automatically have 5GHZ wifi, or...

@terziyski Hello, i checked everything, and i can still not see the 5GHZ option on my wifi list.

I'm a new RE450 Extender user, i have a problem with finding my 5GHZ network, it's mot showing on my wifi list at all, only the 2.4GHZ one. What do i need to do?