Help required with WLC software upgrade

I have a customer with WLC 4402 in use, running software version 7.0.98.0, and supporting 11 APs at present. The customer wants to enlarge the WLAN, which involves increasing the number of APs. I have purchased a new WLC5508, and have installed it onto the network alongside the 4402. the 5508 is running software version 7.0.116.0. Because the wireless network is critical to the user, we want to move the APs over to the new controller while the network is up and running, then remove the 4402.
However, when we set the 5508 as the master controller, or tell one of the APs to use the 5508 as its primary controller, the AP connects to the new controller, downloads the new software version, attempts to load it but reports an error with the unzipped file size of the software and fails to boot. formatting the flash on the AP, then disconnecting the 5508 from the network and rebooting the AP allows it to connect to the 4402, it downloads the older software and boots as normal. A new AP, if connected to the 5508 in a test scenario (ie no 4402) connects, downloads and boots perfectly.
I have the upgrade software to allow the 4402 to be upgraded to 7.0.116.0, but I am concerned that, if this is installed, the existing APs will then fail to boot from the 4402 or the 5508.
all APs are 3502s, running IOS version 12.04(23c)JA when connected to the 4402 and 12.04(23c)JA2 on the 5508.
Any suggestions would be gratefully received
Thanks

Hi Pat,
thanks for the reply. I am off site until the morning, but will attach the colsole output tomorrow.
Your mentioning a corrupt image makes me wonder - we had a lot of trouble setting up the initial config on the new WLC, getting a lot of launch failures. Eventually things seemed to settle down (it certainly booted successfully first time this morning) and getting an AP to connect without a problem made me hope it was just a quirk of the configuration wizard, but I think I will try a reboot of the WLC before I do anything else, just to check it is stable.
If it is a corrupt image it may take a little while to sort, as we have not as yet got a support contract on the 5508 - the plan was to upgrade the existing contract on the 4402 once they were swapped out, but I'll let you know whats going on
Rob

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