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Welcome!What region are you located?
Was a Factory Reset been performed before and after sending the FW file? Did you use IE to updating FW?
Need to rename the default SSID names to something new. Can be anything as default names could be used by other near by routers.
Any cordless house phones?
Any other WiFi routers in the area? Link> Use
InSSIDer to find out. How many?
Ensure you have devices that support the 5Ghz radio. Refer to the devices Mfr support site for information on what your devices support. Not all devices support 5Ghz, only 2.4Ghz radios.