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imei ; active customization : 1274-3899_R8A c1904 -xperia M single sim on 8th may - got update notification for update center - 2mb - updated then on the very same day - got system update 15.4.A.0.23 367 MB - downloaded after downloading, when i proceeded further, it said approx. 44 minutes will take to complete installation. then too i proceeded then phone rebooted and shows "could not update" without showing any details i downloaded 367 MB once again to verify, and the same happened. now the update notification has disappeared, how can i get notification back and update successfully? NB : i tried through pc too, And it shows your device is up to date . Please help
What operating system are you running if it's a 64bit or Windows 8/8.1 then run the program in compatibility mode and try again