Cisco Wireless :: Flash Image For Air BR1310G-A

I purchased a used AIR BR1310G-A--K9-R from a local high school that was rebuilding their athletic field.  The AP was used for communications for their pressbox staff.  The AIR BR1310G was part of the schools campus wide WiFi network and was upgraded to an lwapp image c1310-k9w8-m 12.4 3c JA.  Our home sits on a large lot and I would like to convert the BR1310G back to an autonomous AP. 
 
In order convert it back to an automonous AP, I will need the original image.  The school used a contractor for their WiFi network and they do not have a backup of the original image.  I do not have a service account with Cisco so downloading the autonomous image from the Cisco website is out.  What are my options for either obtaining an image file or using the current managed image without a WLC?