Cisco Cisco Flex 7510 Wireless Controller

Copy the AES file (for example AIR-CT8500-K9-1-10-0-0-FUS.aes) to the default directory on your 
TFTP or FTP server.

Enter the following commands on the Cisco WLC CLI:

transfer download datatype code

transfer download serverip serverip

transfer download mode {tftp | ftp}

transfer download username user

transfer download password password

transfer download filename filename.aes

transfer download path /

transfer download start

Enter the following command to reboot the Cisco WLC:

Information similar to the following is displayed; this is a sample output from a Cisco 8500 Series WLC:

Booting Primary Image...

Press <ESC> now for additional boot options... 

  Booting 'Primary image'

Detecting hardware . . . . 3

INIT: version 2.88 booting

Configuring network interfaces... done.

Setting up the kernel dump handler.. 

BzImage is not rINIT: Entering runlevel: 3

Detecting Hardware ...

FUS Upgrade.....

      ******************************************************************

      *

      *                  FIELD UPGRADE SOFTWARE                        *

      *

      * Please make sure POWER SUPPLY is always ON during this period. *

      *

      * Any loss of POWER will completely kill this unit and make it   *

      *

      * unrecoverable.                                                 *

      *

      ******************************************************************

      Files included in this upgrade package: 

      * ER Image   *

      * Bootloader *

head: invalid option -- '1'

BusyBox v1.20.2 (2014-01-25 04:41:54 EST) multi-call binary.