APs not associating with Controller after upgrade

This is pretty bad.
I've been upgrading our controllers to 4.2.209.0 without any problems untill today. The controller upgraded fine but, the APs aren't showing up anywhere. They aren't associating with any controller. I've shut/no shut the PoE ports. They show connected. The WCS says they are not associated with any controller. What should I do. Roll back the image? Will this help?
Thanks Pat.

Surendra,
Thanks for the response. I got this from debug dhcp detail
DHCP: QScan: Timed out Selecting state%Unknown DHCP problem.. No allocation possible
I was pretty desparate at the time so, I wasn't able to trouble-shoot any further. After I saw the DHCP debug I deleted the normal DHCP server address, created a scope for the APs and configured it on the AP management interface and the APs got addresses. After the APs got their addresses, the clients got their addresses from the regular DHCP server. I will try again with the upgrade as I rolled back to 4.2.112.0. Atleast I know I can get an ip from the controller if I need.
Do you know of any reason why my APs weren't getting addresses. Even when I rolled back they weren't getting addresses. The config hadn't changed.
Thanks, Pat.

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