Download iphone3,1 4 2 1 8c148 custom restore ipsw

File name:

iphone3,1_4.2.1_8c148_custom_restore.ipsw

File size: 631.46 MB
Download from 4shared.com:
Source link: http://www.youtube.com/watch?v=6oW9VZ_OXRQ
Source title: How to Update iPhone 3g/3gS & iPhone 4 to Custom iOS 4.2.1 Preserving your Baseband - YouTube

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