ZS PVOS PRO - the unique OS for PV-S250, PV-S450 models.

Features:

- based on PVOS 1.02 from Casio
- advanced file management system
- clock and battery indicator at the menu
- automatic synchronization with a bootstrap patch
- multimedia components
- and many others

Unfortunately, this variant of PVOS has been removed because of claims of SSC LG.