how to update my samsung galaxy s2

how to update my samsung galaxy s2

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Info
Model name     GALAXY S II
Country     Vietnam
Version     Android 4.1.2
Changelist     1002531
Build date     Mon, 08 Apr 2013 06:07:37 +0000
Product code     XXV
PDA     I9100GDXLS8
CSC     I9100GOLBLS8

version I9100GDXLS8_I9100GOLBLS8_XXV 4.1.2

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