If the wireless device has a firmware failure, you must reload the image file using the Web browser interface or on 1100 and 1200 series access points, by pressing and holding the MODE button for around 30 seconds.

However you cannot use the MODE button to reload the AP image file on Cisco 350 series APs. For information on how to reload the AP image file on the Cisco 350 series AP, refer to the instructions in the Using the CLI section of the same document.

This method can be used when the IOS image on the AP is corrupt. When there is a firmware failure all the LEDs on the AP will glow red.

For information on how to reload the AP image with the MODE button, refer to Using the MODE button section of the document Cisco IOS Software Configuration Guide for Cisco Aironet Access Points, 12.3(8)JA:

For information on how to reset the AP to the default configuration, refer to the Resetting to the Default Configuration section.