I ordered two DS7s. One came with 3.x and one came with 2.2.2 and is pretty adamant about there not being an update available. So I decided to do it myself. I've got Clockwork Mod Recovery 188.8.131.52 (also tried many other versions) and I've tried numerous different ROMs. I got two to "work". They went through the motions, said formatting, copying, etc. Looked like it worked perfectly. When I reboot, it's still 2.2.2 with all my previous settings. I've done this multiple times. It is rooted. I've also done numerous factory resets before and after flashing the "working" ROMs.