No way except a backup. if it was cshell, scroll on down to the last custom position (more|more|F5). If you have a pc link, transfer your fave OS and custom menu modifier software (which needs zshell to run) and load ZShell/CShell/usgard/PhatOS/whatever to every single spot. delete everything except the shell it self, and load back to your computer. then just use that as 'blank'.