It took me a while to get this information, so thought I'd share. Here it is:
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You cannot use the upgrade tool to do the IOS to LWAPP for the 1250 APs.
Here is a method to do the conversion.
*Method 1 : ( Mode Button )*
1. Install an external TFTP tool such as tftpd32 tool from http://tftpd32.jounin.net/
2. Assign IP address in the range 10.0.0.x ( Ex : 10.0.0.3)to the server.
3. Download the IOS to lwapp image onto the tftp's root directory. Use http://www.cisco.com
4. Make sure you set the IP address on the BVI interface of the AP if
not set.Set it in the 10.0.0.x range.
5. Connect the Ethernet port on AP to your TFTP Server ( Laptop )
5. Hold the mode button and power off the AP.
6. Power back the AP while continually holding the mode button for 20-30
seconds.
*Method 2 : ( Archive Command )
*1. Install an external TFTP tool such as tftpd32 tool from http://tftpd32.jounin.net/
2. Assign IP address in the range 10.0.0.x ( Ex : 10.0.0.3)to the server.
3. Download the IOS to lwapp image onto the tftp's root directory. Use http://www.cisco.com
4. Make sure you set the IP address on the BVI interface of the AP if
not set.Set it in the 10.0.0.x range.
5. Connect the Ethernet port on AP to your TFTP Server ( Laptop )
6. On AP, type archive download-sw /overwrite /force-reload tftp://192.168.5.210/c3201-k9w7-tar.124-3.JK2.tar
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Going the other way (lwapp to autonomous)
http://www.cisco.com/en/US/docs/wireless/access_point/conversion/lwapp/upgrade/guide/lwapnote.html#wp161272
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If you need to manually "prime" the LWAPP:
AP#lwapp ap ip address <IP address> <subnet mask>
AP#lwapp ap ip default-gateway <IP-address>
AP#lwapp ap controller ip address <IP-address>
AP#lwapp ap hostname <name>
(optional)
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Hope someone finds this useful!
