Assuming your box is the Edision OS-Mini+ Plus, the latest image is here... http://www.openvix.co.uk/index.php/d...-os-mini-plus/
Plugins are available for 5.1.nnn releases, but your current version, 5.0.023 no longer has a plugin feed.
I'd take an image backup, a settings backup and then couch flash 5.1.003, followed by a settings and plugin restore.
Going back to does Menu > Setup > ViX > Image manager not give you the yellow button option to download??