Here is the detailed step by step video guide containing the exact process to jailbreak your iPhone 4 using Greenpoison RC5 on iOS firmware 4.2.1. This is a video tutorial of the Greenpoison 4.2.1 Jailbreak guide posted earlier which works on both MAC and Windows PC. Follow the links at the bottom of this post for direct download of Greenpoison and essential tools and application required during the jailbreak process . Also don’t forget to post your questions in the Jailbreak Forum .
Greenpoison 4.2.1 Jailbreak Youtube Video – Windows :
Greenpoison 4.2.1 Jailbreak Youtube Video – Mac :
Useful Links :