When jailbreak with redsn0w for iphone iso 4.0 or below, you might stuck at “Downloading Jailbreak Details …”
The solution is to user RecBoot to exit the Loop in Recovery Mode and jailbreak again.
Windows and Mac RecBoot:
What is RecBoot?
Ever need to get into Recovery Mode to jailbreak, but always had trouble? Ever get swtuck trying to get out of Recovery Mode? Don’t even know how to get into Recovery Mode? Broken Home Button? You need RecBoot, the one click, fast and easy solution.
RecBoot is a simple, easy to use, one click program that can boot your iDevice into/out of Recovery Mode. This should work on every device/Windows OS, I see no reason why it shouldn’t however if you do find any bugs, email me at firstname.lastname@example.org.
Currently, RecBoot supports Windows and Mac OS X, full credit goes to the0rkus for writing the Mac version.