Credit goes to volkspost @ hackint0sh (for packaging it all up) and Dev Team for initially spilling the beans (though it required some terminal hackery)! volkspost has done a remarkable job in automating the whole procedure saving the average user lot of time and terminal panic attacks!
Macbooks (both Unibody and 10.5.6 enabled Macs) have regained the precedence in iPhone hacking world (QuickPwn / Pwnage). No more switching back to a painful Bootcamp XP partition.
Before you proceed further, make sure your Mac is upgraded to 10.5.6. Quit all running applications on your Mac.
All you have to do is :
1) Download and extract this file to the Desktop [Crucial step]
2) Double click the automator script named Fix_DFU_10_5_6
3) Provide your Admin Root password when prompted
4) It might seem a little confusing if you are not used to automator scripts [Take a look at the sequence of images – from start to finish]
5) Provide your user account password when prompted [may or may not be different from sep 3]
6) Click through the friendly prompts you see on screen.
7) It will automatically restart your Mac once everything is done. Please be patient. This may take few minutes.
8) You are all set for QuickPwn and the much awaited yellowsn0w.
p.s : Verified by me on Unibody Macbook Pro [late 2008] machine. All other support enquires (bluetooth, trackpad issues) should be directed to the original post. Courtesy : volkspost and Dev Team.