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Even after the Software is updated via computer The phone sill shoews that a update is avaialble.
I tried to see build number na dit says 15.2.A.2.5(the latest one) os if the phone ha sthe ltest version then why doe sit say a new update is available?
That sounds quite strange. Try to clear data for Update Center under settings > apps > all > Update Center > clear data. Restart phone.
Also some applicationa like facebook,candy crush n WtsApp become un responsive after this update.
You need a software repair via sony update service.