Buggered something in /etc/rc.d/rc.sysinit file now Tivo wont start.

Was trying to get tyserver to start automatically when Tivo boots.

I cant ping it etc. But wondering if I put the HDD into a PC, can I use a DOS bootdisk to access the files, and remove the line I added to rc.sysinit? Can I simply type "edit rc.sysinit" in DOS from the bootdisk?

If all is buggered and I have to wipe and reload again what is the latest Tivo image available? I think I was using 1.3.

Thanks for your help,