Have you tried searching through all the codes using the instructions @ Find a Code

Even if your exact code is not listed in the guides, cycling through them you might find one that works.

Other than that, as far as I am aware the newer remotes contain the same codes as the original remote (maybe Darren will pop in to confirm). I do know that newer TiVo Software has more choices built in to the menus, perhaps the TiVo programs the remote or the TiVo remote causes the blaster to issue the correct commands.

Peter