change of mobile os from icecream sandwich to jellybean
i have samsung galaxy duos s gt-7562 older version of gt-7582.. it has icecream sandwich os.. it is slow in processing.. even battery discharges fast as 1500 mah..hardly it goes upto 3-4 hours if u use it constantly..but new version has jelly bean .. i even dont how to upgrade os & resolve battery problem like using higher mah battery .. if any one has idea jus share..
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