Update error on Websphere

I was trying to update a WAS 6.0 server on linux with
6.0-WS-WAS-LinuxX32-RP0000002.pak

It completed successfully.

Then with the same IBM Update Installer for WebSphere package(6.0.2.0) I tried to apply the fix pack 6.0.2-WS-WAS-LinuxX32-FP00000013.pak to the server but it kept popping up the message

"Unable to find IBM WebSphere Application Server at a version that is greater than or equal to 6.0.0.0 and less than or equal to 6.0.2.0.".

The issue was that it had to be done with IBM Update Installer for WebSphere 6.0.2.7. So I moved the earlier updateinstaller directory to updateinstaller.old and then untarred the new version, moved the fixpack to the maintenance directory and ran updateInstaller and it worked.

Websphere uninstallation error

Often when we remove the /opt/IBM folder manually to remove a Websphere installation (for reinstalling) this error pops up during the second attempt

Specify a different directory or perform a manual uninstall to remove all packages before reinstalling to the same directory

This happens because the WAS installation is stored in more locations than just the /opt folder. To clean up the system after you accidentally remove the /opt folder,(kill all java processes first)

1) rpm -qa |grep WS
and remove the rpms

2)remove the ~/.WASRegistry file.

3) remove vpd.properties.