I'm trying to remain calm. My STB had a message saying there was a critical update to the software and a countdown clock. It did its thing, re-started and re-loaded. When it was done, I wanted to return to my almost full DVR recordings because I watch all shows there.. it told me it was empty. No recordings. No scheduled recording. No deleted recordings.
I rebooted the STB. Still no go. I thought perhaps I could find the "cloud" my settings should be saved but so far no luck. Ironically I was going to upgrade to a larger DVR because I was at 97 - 100% and figured it would be nice to have even more. Now it's gone.
I PAY FOR THIS!!!!!!!!
Firmware updates don't wipe out the hard drive. If it did, it sounds like there was some kind of hardware failure already starting to take place and the update just was the final blow.
Unfortunatly there's not much that you can do as the shows are gone, but would suggest maybe swapping the box out for a new one so any future updates don't give you the same results.