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I keep getting the message that the latest software, 6.1.A.2.55, but when I check using the companion tool, the latest software is what I already have, 6.1.A.2.45. Also, I get the message that I need a 32 bit browser. Is there any other way to circumvent this?
Try updating the phone using Update Service and see if that helps: http://www.sonymobile.com/global-en/tools/update-service/