I have a Sony Ericsson Xperia 10 smartphone, running the 1.6 version also. I wanted to update(upgrade) to 2.1 or 2.2 so I could do more with it. The Sony Ericsson site told me the same thing, so I tried to download the backup software, which wouldn't work. I then tried another 3rd party backup, hoping that would work, but after doing the update(upgrade) I tried to restore my files and nothing was there. So, I erased many tweaks I had made, but my contacts and pictures were still there, and I just downloaded the apps I had all over again. Then I went to the specs and found out I still had 1.6 OS and nothing had been updated(upgraded). I followed instructions faithfully but I didn't get my new OS. I guess the joke's on me...