installed tomato on 6300v2 but 5g SSID not being broadcast and/or not detected?

Hello All,

I am new to this forums. 

I had dd-wrt kong build. I have flashed back to stock. flashed tomato found on this site. configured like in the video (choose singapore as country, etc) 

everything look fine i have 1300 bandwitth in the status page but my devices do not see the 5 ghz network. 

I have a brand new dell xps laptop and a samsung galaxy s7 edge.. they should see 5ghz just fine but somehow they don't 
 

why i cannot detect and/or connect to the 5ghz not even see the SSID. 

thanks in advance