Hi,
I hope you would have read entire thread which i had linked in previous comment.
Check ioniancat21 comment
" Being that I have only one domain, I was able to uninstall the RU7 SEPM and do a fresh install of SEPM 12.1 and then follow the 11.x DR documentation linked above to restore back my DomainID and JKS Keystore file. All my clients appeared in a few minutes and all I had to redo was the groups and policies, which I would have done anyway going to this new version as some features have been added.
Anyway, if any of you have a simple one domain setup like myself you can be up and running in minutes. Thanks again to Chetan for providing a link to TECH162071 which led me down this road."
I believe you are also trying to do same.