Tasknavrepair theme no longer needed to restore to stock maemo 2006 tasknavigator icons ( use test32 or test33 ).
Try this procedure to remove old builds.
1. Switch to a maemo 2006 theme (theme1/theme2/theme3/theme4).
2. Reboot the 770.
3. Use Application Manager to uninstall AQUA theme.

Try this procedure to remove old builds and replace icons and boot screen.
1. install latest AQUA theme (test 32 on)
2. Switch to a maemo 2006 theme (theme1/theme2/theme3/theme4).
3 .Reboot the 770.
4. Use Application Manager to uninstall AQUA theme.
5. Reboot the 770.
Only test32 and 33 have the ability apon removal using the application manager to replace tasknavigator icons as well as boot screen and boot progress bar