I ran into this problem and tried every solution out there. The key (at least for me) is that you need to make sure you have removed almost everything off your iphone before you begin the process. Movies, Apps, Music etc all need to be removed so that you have a minimal amount of stuff. Then start the process and that should get you through. I have tried this at least 5 times now and the only time I can get it to avoid hanging on the Apple logo is to remove everything off the phone before starting Quickpwn.