What model TiVo? If it is a 54XXX model then you can't hack the receiver at all (except for drive upgrades) without changing a surface mounted chip on the motherboard.
If it is an earlier model, then you need hack the OS to allow you to install your own files. Start with a search for "killhdinitrd" and follow the path from there.
310 GB DSR-704
250 GB SIR-4040
240 GB SD-DVR80
240 GB DSR-708
80 GB DSR-7000 (Slingbox attached)
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