Solaris

I am administering a Solaris 10 server that I have root password for but need to get to the system server console. The password has been 'forgotten'.
I've tried changing it in /var/opt/mps/serverroot/admin-serv/config/admpw and local.conf with the current hashed password in /etc/shadow for a user there. This was unsuccessful.
I've also tried /usr/sbin/mpsadmconfig -ser <serverort> -u <having it read the admpw file for the current username and password > -setadminp <new password>
but I get an error message: Status = -1 Task -setadminpwd failed: null

Can someone suggest what I'm doing wrong or if there is a better/easier more effective way to do this? I need to copy over the LDAP files from this system to a new one being set up.
Thank you!
UPDATE: have found the plain text version of the password in /var/opt/mps/serverroot/admin-serv/config however, this password is not working as well.

What Solaris Platform do you have? Sparc or x86?

What version of Java Web Server is it?

Is this relevant??

Resetting the Administration Password (Sun Java System Web Server 7.0 Update 2 Administrator's Guide)

It's a sparc and it's version 5.2
Thank you for the suggestion though. It was in the right direction.

Version 5.2 !!!!!

Do you know about this..............

Sun Java(TM) System Directory Server 5.2 Patch 5 Release Notes

Right, no, I did not know about that but it is good information. I don't believe they are planning on upgrading it. They are creating a new platform and migrating over. I was just advised that breaking into this "older" server is no longer necessary.....
Thanks for your help.