Try this:

To recover from a corrupt IOS on an 1100 Series Ap follow these steps:

Step 1 The PC you intend to use must be configured with a static IP address in the range of 10.0.0.2 to 10.0.0.30.

Step 2 Place a copy of the access point image file (such as c1100-k9w7-tar.122-15.JA.tar for an 1100 series access point or c1200-k9w7-tar.122-15.JA.tar for a 1200 series access point) in the TFTP server folder on your PC. For additional information, refer to the "Obtaining the Access Point Image File" and "Obtaining TFTP Server Software" sections.

Step 3 Rename the access point image file in the TFTP server folder to c1100-k9w7-tar.default for an 1100 series access point or c1200-k9w7-tar.default for a 1200 series access point.

Step 4 Activate the TFTP server.

Step 5 Connect the PC to the access point using a Category 5 (CAT5) Ethernet cable.

Step 6 Disconnect power (the power jack for external power or the Ethernet cable for in-line power) from the access point.

Step 7 Press and hold the MODE button while you reconnect power to the access point.

Step 8 Hold the MODE button until the status LED turns red (approximately 20 to 30 seconds), and release the MODE button.

Step 9 Wait until the access point reboots as indicated by all LEDs turning green followed by the Status LED blinking green.

Step 10 After the access point reboots, you must reconfigure the access point by using the Web interface, the Telnet interface, or IOS commands.

Or this:

use the following cmds to load tftp img

ap: copy tftp://138.50.225.9/c1130-k9w7-mx.124-3g.JA1 flash:c1130.JA1

ap:set IP_ADDR 138.50.156.143

set NETMASK 255.255.255.192

set DEFAULT_ROuter 138.50.156.192

boot flash:c1130.JA1

Here is a link:

http://www.cisco.com/en/US/docs/wireless/access_point/12.2_13_JA/configuration/guide/s13trb_ps4570_TSD_Products_Configuration_Guide_Chapter.html#wp1038660