jailbreak 4.2.1 iphone 4 windowsbr GreenPois0n rc4 is a multi-platform (meaning it works on Windows, Mac and PC) Jailbreak for iPhone, iPod Touch, and iPad. It uses the Shatter exploit, and is a very simple and easy to use GUI Jailbreak.br br Stuff it works for:br iPhone 3GS ( new bootrom Untethered )br iPhone 3G - Untetheredbr iPod Touch 4G - Untetheredbr iPod Touch 3G - Untetheredbr iPod Touch 2G ( new bootrom Untethered )br iPad WiFi + 3G - both Untetheredbr br DOWNLOAD:br windows: mac: br Extra Tagsbr br jailbreakbr jailbreak ps3br jailbreak 4.2.