I was in the same boat,so I bit the bullet, deleted everything, downloaded the new image (1.4) and reinstalled my Tivo. Everything is now back up and running, with the exception of the holes in the data mentioned in other threads.
I will say that 1.4 is massively easier to install than 1.3 ever was and the instructions available now (http://www.nztivo.net/index.php/Welcome_to_NZTivo) made the process very easy. Actually I think it took less time than I had previously spent trying to change between the old and new emulators.
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