KS 52 should download a fresh copy of v8.3x if that's what you currently have. No guarantee that doing so will allow the upgrade to complete of course, but it might and shouldn't do any harm. I'm not an expert but TiVo's run a proprietary format on the HDD, something of a mix of Linux and Apple IIRC. There are a number of "partitions" on TiVo's HDD...two are for the OS, one active and an alternate for upgrades. They are fully separate from the other areas which are for the recordings, guide, indexing and such. KS52 should have no affect on your recordings. Keep us posted!