I just bought an Aironet 1141 (AIR-AP1141N-A-K9) with IOS (C1140-K9W7-M, Version 12.4(21a)JA1) . I have 2 issue with it:
1- I just had the 2.4-GHz Radio and there is no 5-GHz radio anymore in web base interface.
2-I need to connect to my Aironet access point with 300Mb Data Transfer Rate but my max speed is 54Mb right now
Note: I already setup WPA-pre shared key on the access point
Please help me to find a way to fix these issues.