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you need to know that this guide teaches you how to jailbreak the iPhone 3GS running on iOS 4.0. No other models are yet supported. Also, it only supports just old bootroms with basebands ranging from 05.11.07 to 04.26.08, preserving the version so you can unlock them later. Your iPhone must be jailbroken at least once before, with redsn0w, PwnageTool, Blackra1n or Sn0wbreeze and you must use a MAC
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Not sure about bootroms and basebands...and it wasn't previously jailbroken and I already updated ios4 so I guess I've got to be patient and wait for another update to redsnow...