Got one of these? A recent update may have passed you by. Check your Sony Ericsson Update Service for further details of the update, which appears to contain fixes and speed improvements for your Xperia X1 handset.
News of this update seems to have appeared on the Sony Ericsson site on February 13th and should change your software version (In Device Info->Customer Info) to “R2AAXX”. Some users may have noticed that the QWERTY keyboard has random LED lighting and the phone could be slow at times, but the update appears to have fixed these issues and more. As normal it’s best to backup your data and the update may not be rolled out to everyone depending on your operator.
Link – Sony Ericsson Update Service