Ze620kl doesn't recognize 5ghz Wi-Fi

Hi guys, I own a ZenPhone 5 ze620kl and I always used it with my 5ghz wifi on my ISP provided router (a tecnicolor) something.
Problem is I now have a more powerfull router to manage my Internet that suports dual band wifi, but my phone doesn't recognize the 5ghz Wi-Fi, only the 2.4 one. All the other devices that support dual band wifi in my home detect it, but this phone does not.
Why is that with the other router I didn't have any problems and now I have?
According to GSM arena my phone has Wi-Fi 802.11 a/b/g/n/ac, isnt that supposed to mean that it supports 5ghz wifi?
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Hi paulorafael62
Thank you for your asking. Kindly provide the information below so that we can better assist you.
1. Your current firmware version
Settings>System>About Phone>Software information
2. Your current router model name
3. Can your phone detect 5 ghz wifi in other area now?
4. If you put your phone and other devices in the same room of the router, can other device detect 5 ghz wifi yet can't your device?
5. Please try reset Network: Settings>System>Reset options>Reset Wi-Fi, mobile & Bluetooth
6. Please try turn off the router and reconnect the signal.