hmm? Do you know greenpois0n? Greenpois0n is a jailbreak support firmware 5.1.1 .The first step download the Greenpois0n via this link.If you was using WINDOW press the (absinthe v2.0.2 (win)) on the right top..After you downloaded the greenpois0n extract the file and save to My document..
Once you extrated the file, it will show another file absinthe-win-2.0.4.Click in and read the note named "read me" There are the way to jailbreak your iphone easy ,safe and fast!! Enjoy~~ :D
(mention: rememder to backup your iphone once you jailbreak your contents and settings must be erase to process jailbreak more fast*)