Here is the step by step process that we have to take care of while converting LWAPP to IOS and then vice versa..
LWAPP to IOS
The hardware used = 1141 AP (make sure we are using the right image)
c1140-k9w7-tar.124-21a.JY.tar not c1140-rcvk9w8-tar.124-23c.JA.tar
I request you to do download any image from the below link and perform the conversion from LWAPP image to autonomous..
the methods to convert is..
download TFTPd32 from Google and install it on ur PC.. point the image that you have downloaded in the TFTP server..
connect a Ethernet cable between ur laptop and AP.. both should be in the same subnet.. and connect a console cable and get the hyperterminal console access and issue the command.. make sure you are able to ping the PC and the AP and vice versa!!
AP#debug lwapp console cli or debug capwap console cli
AP(confg)int fa 0
AP(confg-if)ip addr <addr> <mask> (same subnet as that of the laptop)
AP#archive download-sw /force-reload /overwrite tftp://<tftp ip address>/<image name.tar>
AP#archieve download-sw /force-reload /overwrite tftp://10.0.0.5/c1140-k9w7-tar.124-21a.JY.tar
The above command will do it for you!!
IOS TO LWAPP
Now to reconvert the AP back to LWAPP..
Download the LWAPP image(W8) from the Cisco website and get the console access the AP and just issue the command..
archive download-sw/overwrite/force-reload tftp://<IP address of the TFTP server>//<image>
AP#archive download-sw /force-reload /overwrite tftp://10.0.0.5/c1140-rcvk9w8-tar.124-23c.JA.tar
I assume we have the TFTPd32 downloaded from Google and in the TFTPd32 pointing to the image.
For 1100 series APs
here is the link which will help you..