How to remove VyperVPN app

Hi there,

I'm happy user of Tomato USB from Shibby. I have a Netgear WRN3500Lv2.

Yesterday I installed the tomato App for VyperVPN that basically add a Submenu to connect the router to out VPN.

I have some issue with this app, so I decided to reset to default my router including the NVRAM in order to remove completely the app.

After the restart the VyperVPN menu persist.

How can I remove completely the app?

Is there an Hard reset?

Thanks!