Why do I need an image to upgrade the working Tivo drive?

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Why do I need an image to upgrade the working Tivo drive?

The PTV upgrade failed saying that an image is not found. I have a 80GB drive running sw 4.0.1-01-2-240.  The drive is working in the TCD24004A box. Why do I need an image since this is a working system?

Which PTV upgrade are you

Which PTV upgrade are you referring to?

I was using PTVupgrade LBA48

I was using PTVupgrade LBA48 4.04 CD.