I have a Phillips DSR7000 DirecTivo unit which I Upgraded the Hardrive to 160GB and to 6.2 software. I used PTVupgrade CD and Instacakes - this was back in 2005. I have done nothing to the unit since then. I woke up today and found most of my local channels were not in the Guide and would not come in. I searched the net and found several posts stating that for my unit I need to upgrade to 6.4 software for the channels to come back in. What is my best course of action to maintain my mods? Is slicer my best option? If worse, comes to worse, I'd be willing to just let the upgrade happen since I rarely access my unit remotely anyway (I can access it, but some of the features don't work right). If I let the upgrade happen would it simply change my unit back to original state?