I am using i Phone 3GS with 4.1 i OS i want to updte it to 4.3 . how do update?
I Don't think this is possible, as it would mean having to downgrade from IOS 5.1.1, on a 3GS you will see a slight performance decrease but I do not think that you can update to anything but the most recent software update.
Correct. If you update a phone then you are updating to the latest possible version for that phone at that point in time, which for a 3GS is 5.1.1.
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