You have to give it to the guys at XDA-Developers, they really do some great work. Shortly after Android 2.1 was released for the Nordic market, the guys worked out that you could change your X10i to be Nordic branded and thus update to Android 2.1. Unfortunately this was only for X10i owners, as owners of X10a handsets have different base bands and therefore, if the Nordic branding worked, 3G would no longer be available.