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How could I repair the phone with the PC companian? Please help me.
Firstly you can download PC Companion here: http://www.sonyericsson.com/cws/support/mobilephones/downloads/subject/pccompanion/cedar?cc=gb&lc=en
Once installed on your PC, run the program and follow these steps:
Support Zone > Software update > Repair phone > Follow the on screen instructions.