The iPod mini 1.0 Software updates and restores software on your iPod mini.
Update: Installs iPod mini 1.0 software on your iPod mini. Songs and other data on iPod mini are not affected.
Restore: Erases the entire contents of your Pod mini, resets all iPod mini settings, and then installs new software.
iPod mini software is not compatible with other models of iPod, including original scroll wheel and touch wheel iPods and iPods with a dock connector. The iPod mini 1.0 updater will not update or restore other models of iPod.
More info and download link here.