My iphone 3gs won't update past 4.2.1. When ever I press check for updates it always comes up with: This version of the iPhone software (4.2.1) is the current version. My itunes is the latest update. How do you update my phone to the latest ios?
This may indicate that you have a 3G, not a 3GS. Please verify the model number and post back.
Verify that you are actually running the current version of iTunes and as stedman suggested that you also have a 3GS and not just a 3G.
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