Ok so I've purchased 3702 + 2504 bundle (http://www.cisco.com/c/en/us/products/collateral/wireless/aironet-2700-series-access-point/brochure-c02-733838.html) but the lights flashing green - red - off and my clients cannot connect via 5ghz and cannot ...

I've just purchased WLC2504 + Aironet3702 bundle. After initial configuration, the network is up and running. However I've been trying to test 802.11ac capability to no avail. None of my clients are on 5ghz, these are my ac capable phone (Oneplus one...