Reset Admin password lost on Pentaho 5.0.1 CE

Hi,

Before Christmas I installed for testing purpose a Pentaho 5.0.1 CE following the Pentaho BI Server 5.0.1CE MySQL installation guide

At installation time I changed the Admin password. After Christmas holidays I cannot enter in the Pentaho portal because I don't remember it :(

I have the report-designer configured with the admin password and using it I can enter in the repository. But the password there is encrypted. So I cannot recover it from the config file. It appears like this :

password=Encrypted 123daadsdf234jfsfq2r

I also though that the password was kept on the mysql DB on the hibernate but I cannot see it there.

Any Idea how can I reset/recover the admin password.

Thank you for your time

Best regards