How to update a iphone 3 to ios 4.3?

How to update a iphone 3 to ios 4.3?

Connect your iphone to a pc and that pc should have itunes software.
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hen you connect your iphone to that pc a pop up box will appear showing you the current updats.
On Clicking on update your phone will be updated

Must have:
Windows or Mac with Latest iTunes.
Phone to USB

Plug iPhone into Computer, open iTunes, click Device, click Update, done.

EDIT: If the update isn't there, download the target Firmware from any site thirdparty or not. Save the file to somewhere you can path iTunes to it. Go to iTunes, hold Option (alt on windows) and click update.It'll ask what file you would like to update the device to. Choose the downloaded firmware.

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