Hi Vijay,
Please check if these method can Help you:
Web Browser Method
Web browser method
Follow these steps to delete the current configuration and return all wireless device settings to the factory defaults using the web browser interface:
Step 1 Open your Internet browser. You must use Microsoft Internet Explorer (version 5.x or later) or Netscape Navigator (version 4.x).
Step 2 Enter the wireless device IP address in the browser address line and press Enter. An Enter Network Password screen appears.
Step 3 Enter your username in the User Name field.
Step 4 Enter the wireless device password in the Password field and press Enter. The Summary Status page appears.
Step 5 Click System Software and the System Software screen appears.
Step 6 Click System Configuration and the System Configuration screen appears.
Step 7 Click the Reset to Defaults or Reset to Defaults (Except IP) button.
Note
Select Reset to Defaults (Except IP) if you want to retain a static IP address.
Step 8 Click Restart. The system reboots.
Step 9 After the wireless device reboots, you must reconfigure the wireless device by using the Web-browser interface or the CLI. The default username and password are Cisco, which is case-sensitive.
for more
https://supportforums.cisco.com/docs/DOC-4532
Regards
