Unhappy [Q] 5ghz wifi probleme

I bought the G2 model of the international version D80210B
Israel and I found the version of JB.
I can not see the frequency 5GHZ in WIFI.
I changed some modems of all kinds of countries and changed to KK and still the same.
I spoke with the importer gave me excuses.
I deleted the EFS Remote share and - FIRMWARE through the RECOCERY and was also increased when the phone shows the frequency 5GHZ.
But ... I had no mobile reception so I had to restore the directories I deleted.
Members What to do How do I open this limitation?