Please add 3 more to the list. I successfully used the manual approach. Was quick and easy.
BTW Using Kitty I could not SSH into a friends Tivo, so in Kitty I clicked Telnet and went straight in.
Pasted the following in one hit and clicked enter.

cd /tmp
wget http://hd.oztivo.net:8000/static/swu...te-v3.snow.bnd
tar xf OZ-update-v3.snow.bnd
tar xzf swupdate.tar.gz
./update.sh

It rebooted and all was good.

Thanks to MattCallow for this ("Manual install" page 5).

And many thanks to all for the great efforts.