I know if I change the settings on my Netgear router I get fewer allowed channels for certain countries, the UK seems to allow all channels, can't tell you what the US allows. Your shopping centre could be on a channel not allowed in the US. Don't know if a re-flash to a different firmware would help as I don't think it helped people trying to get the radio transmitter working in countries that didn't allow it.

Where are you? Are you in the US or from the US? seeing how you spelt 'center' the US way.