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HOW TO: Downgrade iPhone 3Gs From Firmware 3.1.3 to 3.1.2

this tutorial is aimed ONLY to iPhone 3Gs users that have saved their ECID file through Cydia. If you are not sure about saving your ECID file throught Cydia, than load Cydia and on the homepage check if you see this message: This iPhone 3Gs has an ECID SHSH on file.

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