12.2c dbua complains 10G version password being used

since dbua complains, and I checked the 12.1 database to be upgraded.
"In exclusive mode, accounts which oly have the 10G password version (see DBA_USERS.PASSWORD_VERSIONS)"   ...


There is one account RMAN somehow is having 10G version password.

SQL> select username, password_versions from dba_users where username='RMAN';

USERNAME
--------------------------------------------------------------------------------
PASSWORD_VER
------------
RMAN
10G

although the parameter sensitive is already true, set the minimum allowed version in sqlnet.ora (SQLNET.ALLOWD_LOGON_VERSION_SERVER) to 10. but still not worked for me.

Finally, solution worked for me is to change its password manually.

SQL> password
Changing password for RMAN
Old password:
New password:
Retype new password:
Password changed
SQL> select username, password_versions from dba_users where username='RMAN';

USERNAME
--------------------------------------------------------------------------------
PASSWORD_VER
------------
RMAN
10G 11G 12C


SQL> password
Changing password for RMAN
Old password:
New password:
Retype new password:
Password changed
SQL> select username, password_versions from dba_users where username='RMAN';

USERNAME
--------------------------------------------------------------------------------
PASSWORD_VER
------------
RMAN
10G 11G 12C

DBUA complains database not in mounted state

"The Upgrade Assistant failes in bringing up the database XXX. Oracle Home /oracle/XXX/11202 obtained from file /etc/oratab was used to connect to the database. Either the database is not running from Oracle Home /oracle/XXX/11202 or the correct Initialization Parameter file (pfile) was not found" Then it asks me to locate the pfile.

My case is similar to http://scn.sap.com/thread/1938507

So cat the Welcome_.txt 

> cat  Welcome_TTTT.txt
The presence of this file indicates that the database is opened up with the new Oracle Home binaries.

/software/orattt/admin/cfgtoollogs/dbua/logs_bak> ls -lrt
total 188
-rw-r----- 1 orattt orattt    102 Oct 21  2010 Welcome_TTTT.txt
-rw-r----- 1 orattt orattt 140879 May 24 16:03 sqls.log
-rw-r----- 1 orattt orattt   2104 May 24 16:07 PreUpgradeResults.html
-rw-r----- 1 orattt orattt  20034 May 24 16:07 trace.log

That is the culprit.

After I rename the directory, everything goes smoothly.