Cannot upgrade an AP1242 to LWAP using the upgrade tool 3.4

I have installed the tool on an XP laptop.
If I configure the tool to use an external tftp server then I get upgrade failed.
"Unable to Load  the LWAPP Recovery Image on to the AP"
If I use the built in tftp server I get a msgbox with "C:\Program Files\Cisco Systems\Upgrade Tool\images\c1240-rcvk9w8-tar.123-11JX1.tar - LWAPP Recovery Image is not a valid one".
This is the log output
2011/03/15 15:52:57 DEBUG   10.10.10.5   Validating IP address
2011/03/15 15:52:57 DEBUG   10.10.10.5   Opening a telnet connection to the AP
2011/03/15 15:53:00 INFO   10.10.10.5   User  has  Full privilege
2011/03/15 15:53:00 INFO   10.10.10.5   Getting  AP Name
2011/03/15 15:53:00 DEBUG   10.10.10.5   Verify if APs image is 12.3(07)JA or greater
2011/03/15 15:53:00 INFO   10.10.10.5   AP  has 12.3(7)JA Image or greater
2011/03/15 15:53:00 DEBUG   10.10.10.5   Identifying the AP Type
2011/03/15 15:53:00 INFO   10.10.10.5   Term Length configured.
2011/03/15 15:53:00 INFO   10.10.10.5   Upgrade Tool supported AP
2011/03/15 15:53:00 DEBUG   10.10.10.5   Check whether AP has supported Radio
2011/03/15 15:53:01 INFO   10.10.10.5   AP has two radios
2011/03/15 15:53:01 DEBUG   10.10.10.5   AP has Supported Radio
2011/03/15 15:53:01 INFO   10.10.10.5   AP has Supported Radio
2011/03/15 15:53:01 DEBUG   10.10.10.5   Verifying Station Role
2011/03/15 15:53:01 INFO   10.10.10.5   Station role is  Root AP
2011/03/15 15:53:01 DEBUG   10.10.10.5   Check whether AP has  MIC Certificate
2011/03/15 15:53:01 INFO   10.10.10.5   MIC is already configured in the AP
2011/03/15 15:53:01 DEBUG   10.10.10.5   Getting Ethernet MAC address
2011/03/15 15:53:01 INFO   10.10.10.5     Hardware is PowerPCElvis Ethernet, address is 001f.ca28.973a (bia 001f.ca28.973a) 
2011/03/15 15:53:01 DEBUG   10.10.10.5   Getting the Radio Status
2011/03/15 15:53:01 DEBUG   10.10.10.5   Entering Configuration mode
2011/03/15 15:53:02 INFO   10.10.10.5   Inside Shutdown function
2011/03/15 15:53:04 INFO   10.10.10.5   Shutdown the Dot11Radio1
2011/03/15 15:53:06 INFO   10.10.10.5   Shutdown the Dot11Radio0
2011/03/15 15:53:06 DEBUG   10.10.10.5   Getting Current System Time
2011/03/15 15:53:07 INFO   10.10.10.5   Updating the AP with Current System Time
2011/03/15 15:53:07 DEBUG   10.10.10.5   Entering Configuration mode
2011/03/15 15:53:07 DEBUG   10.10.10.5   Executing show run
2011/03/15 15:53:08 INFO   10.10.10.5   Saving the configuration into memory
2011/03/15 15:53:08 INFO   10.10.10.5   Getting  AP Name
2011/03/15 15:53:08 DEBUG   10.10.10.5   Loading the LWAPP Recovery Image on to the AP
2011/03/15 15:53:09 DEBUG   10.10.10.5   Checking the Upload Status
2011/03/15 15:53:11 ERROR   10.10.10.5   Unable to Load  the LWAPP Recovery Image on to the AP
2011/03/15 15:53:18 INFO   10.10.10.5   Dot11Radio0 is up now
2011/03/15 15:53:18 DEBUG   10.18.227.10   Opening a telnet connection to the Controller
2011/03/15 15:53:19 DEBUG   10.18.227.10   Telnet connection to the Controller opened
I see from other posts that JX image is required but it is not working for me. Can anyone help?

If I try to extract the tar file direct to flash I get this:
Loading c1240-rcvk9w8-tar.123-11JX1.tar from 10.1.1.1 (via BVI1): !
%Tar checksum error in fd 0
ERROR: Failed to extract from archive file tftp://10.1.1.1/c1240-rcvk9w8-tar.123-11JX1.tar
Maybe the files are damaged but I have dowloaded them all from cisco.com yesterday.

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