The 6.2 version of CNR has massive differences in the failover config. There are several more steps that need to performed before failover will be enabled.
Here are the steps:
http://www.cisco.com/univercd/cc/td/doc/product/rtrmgmt/ciscoasu/nr/nr62/nru
g/ug26_fai.htm#wp1038632
On the failover-primary (assuming it is 6.2) you will need to create clusters, being certain to add username, password, scp port (1234), and ssh to optional. After you have 2 clusters defined, then go to dhcp -> failover, delete existing failover-pair. Hit create, give it a name, and use the drop down boxes to define which server is primary and
which is failover-backup. Hit add cluster. At this point you should be able to do a sync with failover partner. Go to dhcp -> failover -> sync. Select your mode, then hit REPORT. This should generate the list of changes. At the bottom, click on sync. At this point you need to RELOAD BOTH DHCP SERVERS.