Although TiVo is aware of any upgrade if they take the time to review their logs as long as the original hard drive is installed (or reinstalled), the unit is otherwise unchanged and no mention of the upgrade is made to the CSR TiVo will honor their warranty. The only way to find out would be to perform the upgrade and see if TiVo will boot up. Then if it boots up properly try a menu restart. If it restarts you're good to go. If either fail you'll need to run wdidle3.exe to adjust the Intellipark feature's timeout.