Jail breaking ipod iphone ipad firmware 4.2.1

To jail break and apple product (iPod, iPhone, iPad)
1. Download winrar (link: http://www.win-rar.com/www.win-rar.com/index.php?id=promo_subscribe&dl=/rar/wrar400.exe )
2. Download green pois0n (link: http://greenpois0n.com/ )
3. Now plug in apple devices (iPod, iPhone, iPad) make sure itunes says its connected
4. Start Green Pois0n
5. Follow instructions as shown

Follow instructions

6. Now just wait for green pois0n to hack the apple device