We're using Alfresco 3.3 and have forgotten about the admin password. We've followed instructions at:
 The method with running the SQL command doesn't work since no row is returned
-> I believe the command isn't up to date anymore, could it be updated?
 The method about modifying tomcat/webapps/alfresco/WEB-INF/classes/alfresco/authority-services-context.xml also didn't work. We tried adding the below xml code as per http://wiki.alfresco.com/wiki/Security_Services
Whenever we modify the file Tomcat becomes unavailable with the below error:
404 - The requested resource () is not available
-> Do you have clear instructions as to how modifying the authority-services-context.xml file?
I appreciate I may not be very familiar with Alfresco but I found the procedure/documentation as to how resetting the admin password quite poor.