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WAS V6 for OS/400 software is upgraded using the Update Installer. However, it might be necessary to also install PTFs for Java, DB2, HTTP server, and so forth. Make sure that you read the iSeries specific Update Installer readme file as it lists required individual and Group PTFs.
The Applying service article describes how to use the Update Installer on an iSeries system and what user special authority is needed. You can find this article in the WAS for OS/400 V6 InfoCenter at:
http://publib.boulder.ibm.com/infocenter/wsdoc400/index.jsp?topic=/com.ibm. websphere.iseries.doc/info/ae/ae/os400_readme_updateinstaller.html