This video will show you how to Downgrade iPhone 3GS iOS Firmware from 6.1.6 to 6.1.3.
How to Downgrade iPhone 3GS iOS Firmware from 6.1.6 to 6.1.3
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This video will show you how to Downgrade iPhone 3GS iOS Firmware from 6.1.6 to 6.1.3.