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Hey Guys, here is pH (Pedro Henrique Franceschi). Today, I developed a tool to Downgrade your iPhone Baseband from 02.30.03 to 02.28.00 based on GeoHot’s method. The tool is called pHaseBanDowngrader and works great. You may need to downgrade your baseband to use Yellow Sn0w to unlock. As you may know, YellowSn0w only works on 2.28 baseband. Previously, those of you that upgraded to 2.2.1 could not use YellowSn0w. Now you can.