Aironet AP Missing config command?

Doing just a simple SSID and security change on an AP, I was using the web GUI. But then I was not able to successfully enable WPA, so I resorted to the CLI, only to find that I couldn’t even get into global config mode!

-----ES-AP>en
Password:
-----ES-AP#config t
              ^
% Invalid input detected at '^' marker.

-----ES-AP#?
Exec commands:
  <1-99>           Session number to resume
  access-enable    Create a temporary Access-List entry
  access-template  Create a temporary Access-List entry
  archive          manage archive files
  cd               Change current directory
  clear            Reset functions
  clock            Manage the system clock
  connect          Open a terminal connection
  copy             Copy from one file to another
  crypto           Encryption related commands.
  debug            Debugging functions (see also 'undebug')
  delete           Delete a file
  dir              List files on a filesystem
  disable          Turn off privileged commands
  disconnect       Disconnect an existing network connection
  dot11            IEEE 802.11 commands
  dot1x            IEEE 802.1X Exec Commands
  enable           Turn on privileged commands
  erase            Erase a filesystem
  exit             Exit from the EXEC
  format           Format a filesystem

Where’s the configure command?? This one had me confused for a while…but then I did a show version:

cisco AIR-LAP521G-A-K9     (PowerPCElvis) processor (revision A0) with 24566K/8192K bytes of memory.
Processor board ID #############
PowerPCElvis CPU at 262Mhz, revision number 0x0950
Last reset from power-on
1 FastEthernet interface
1 802.11 Radio(s)