Have you changed the password for the admin user before upgrade? The master password(not the same as the login password) will not change if the password is changed via the sso UI. So try using the orignal password or change the master password via command line (rsautil reset-admin-password)
Please refer the KB http://kb.vmware.com/selfservice/microsites/search.do?language=en_US&cmd=displayKC&externalId=2034608
Also,
If this doesnt solve the issue, also attach the viminst.log and the exact place where the upgrade fails.
Regards
Girish