How to change SYSMAN password

I tried to set password like "emctl setpasswd dbconsole" but EM stop working then i did the below steps for EM working.

Reset SYSMAN Account:
Once the database console is stopped then we will reset the SYSMAN account.
[oracle@myserver log]$ sqlplus "/ as sysdba"
SQL*Plus: Release 11.1.0.6.0 - Production on Tue Feb 12 09:51:59 2008
Copyright (c) 1982, 2007, Oracle. All rights reserved.
Connected to:
Oracle Database 11g Enterprise Edition Release 10.0.2.0 - 64bit Production
With the Partitioning, OLAP, Data Mining and Real Application Testing options
SYS> alter user sysman identified by <new_password> account unlock;
User altered.
Now our SYSMAN account is successfully reset. Now we need to reset SYSMAN account in the targets.xml file. The targets.xml file is located in $ORACLE_HOME/myserver.mydomain _mySID/sysman/emd
We will modify the properties ‘Username' and ‘Password'.
[oracle@myserver emd]$ pwd
/opt/oracle/product/11.1.0/db/myserver.mydomain_DWHD/sysman/emd
[oracle@myserver emd]$ cp targets.xml targets.xml.ori
[oracle@myserver emd]$ vi targets.xml
<Property NAME="UserName" VALUE="SYSMAN" ENCRYPTED="FALSE"/>
<Property NAME="password" VALUE="<new_password>" ENCRYPTED="FALSE"/>
After modifying targets.xml file then we will reset the SYSMAN account in emoms.properties file in $ORACLE_HOME/myserver.my_domain_mySID/sysman.config. We will modify the parameters ‘oracle.sysman.eml.mntr.emdRepPwd' and ‘oracle.sysman.eml.mntr.emdRepPwdEncrypted'.
[oracle@myserver config]$ pwd
/opt/oracle/product/11.1.0/db/myserver.mydomain_DWHD/sysman/config
[oracle@myserver config]$ cp emoms.properties emoms.properties.ori
[oracle@myserver config]$ vi emoms.properties

oracle.sysman.eml.mntr.emdRepPwd= <new_password>

oracle.sysman.eml.mntr.emdRepPwdEncrypted= FALSE
Start the Database Console:
At the end we will start the database console.
[oracle@myserver dbascripts]$ emctl start dbconsole
Oracle Enterprise Manager 11g Database Control Release 11.1.0.6.0
Copyright (c) 1996, 2007 Oracle Corporation. All rights reserved.
https://myserver.mydomain:1158/em/console/aboutApplication
Starting Oracle Enterprise Manager 11g Database Control ...... started.
-----------------------------------------------------------------------------------------------
Logs are generated in directory
/opt/oracle/product/11.1.0/db/myserver.mydomain_DWHD/sysman/log