How to Downgrade iPhone 3G 4.0 OS to 3.1.3 Firmware

April 15, 2010 by admin  
Filed under news

Tutorial to iPhone 3G 4.0 to 3.1.3 OS. How to iPhone 3G 4.0 firmware to 3.1.3 firmware using Apple iTunes and not changing the baseband.

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How to Downgrade iPhone 3G 4.0 OS to 3.1.3 Firmware

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