Unable to update Software

[vishwa12345678]

Unable to update software. Rite top it's says "15.5.A.1.5 New system update Available" but when i click it it ask for PC connection required. Even i tried with USB connect to PC it Does not works. Please advise!!

[_alexdon_]

Download PC companion:

http://www.sonymobile.com/gb/tools/pc-companion/