How to upgrade ios from 4.2.1 to 4.3 on my iPhone 3g?

JINGU

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I have an iphone 3g. It is of ios 4.2.1. and also its jailbroken. In my present version i cant download apps like facebook, whatsapp, viber, etc which requires ios 4.3. Can anyone suggest me how to upgrade ios 4.2.1. to ios 4.3. Please Please.
 
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