Check out this video showing how to update your Sony Ericsson Xperia X10 to Android 2.1. This phone comes originally with version 1.6, you really need to make this update. And the good news are that SE will be releasing the 2.3 update later this year.
Sorry if the video is a little bit long, but I wanted to show the realtime impression of the update, especially in the phase of the first start of the phone after updating. It’s precisely in that moment where a lot of problems occur because users lose patience believing that something is wrong, and restart the phone at that moment may corrupt all the work of the update.