I am on a macbook pro with an iphone 4, 3g at version 4.2.9 (8E501). I've tried jailbreaking my phone on greenp0ison, blackra1n, snowbreeze and now redsn0w. When i browse redsnow in the direction of my ISPW under itunes it still does not work. I'm wondering if its not possible with the version 4.2.9 or I'm just screwing it up some how. If anyone can give me advice it would be greatly appreciated. Thanks!!