How to Update iPhone 3g/3gS & iPhone 4 to Custom iOS 4.2.1 Preserving your Baseband

[postlink] http://howtodoiphone.blogspot.com/2013/03/how-to-update-iphone-3g3gs-iphone-4-to.html[/postlink] http://www.youtube.com/watch?v=6oW9VZ_OXRQendofvid
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Title :How to Update iPhone 3g/3gS & iPhone 4 to Custom iOS 4.2.1 Preserving your Baseband
Tag : how to iphone 3g
Time : 9.57 min.
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How to Update iPhone 3g/3gS & iPhone 4 to Custom iOS 4.2.1 Preserving your Baseband

This video describes how to update your iPhone 3g/ 3gS or iPhone 4 from any firmware lower than 4.2.1 to a Custom 4.2.1 Firmware. It could be 3.0, 3.1, 3.1.2...
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