I have a problem¡ I have a WLC 5508 in 6.0.199.4, THIS DEVICE is of a client, and I want to upgrade to 7.0.98.0 or later. But I don't have this IOS, and to download of Cisco Page, Don't permit me. Can I download other Ios of other client that has the same WLC 5508 and upgrade to the WLC 5508? the IOS doesn't enjoy to serial number of that device?