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DownBB, lets you do just what the title of this post suggests. Lets you downgrade your baseband from 2.30.03 to 02.28.00. 2.30.03 broke the hole needed to successfully run yellowsn0w, iPhone Dev Team clearly warned against updating to firmware 2.2.1 without preserving the baseband of 2.2 or previous firmwares with the world famous PwnageTool

It’s really easy to downgrade your baseband, you can do it right within Cydia with DownBB!

1. Fire up Cydia
2. Install iClarified source from Sources section or http://cydia.iclarified.com/
3. Refresh sources, if needed
4. Tap Sections and Scroll to iClarified and tap
5. Find DownBB and Install
6. Confirm you want to Install. Cydia will do the rest

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Tags: Cydia, Firmware 2.2.1, Hacks, Iphone Dev, Mods, Tips, Top Posts, Unlock, YellowSnow