Because of the many problems who appear while you jailbreaking your A4 device, the Dev Team has released a new version of Redsnow - Redsnow.
New version of Redsn0w includes many stability and bug fixes.
Redsnow 0.9.10b5c version is compatible with: iPhone 4, iPhone 3GS, iPod touch and iPad 1. This updated version is not supported with A5 devices ( iPhone 4S and iPad 2), you can jailbreak them with Greenpois0n Absinthe 0.4.
Redsnow 0.9.10b5c Release notes:
Updated Redsn0w version 0.9.10b5c fixes an issue with using custom ramdisks on iPhone 3G and iPod 2G, and prevents redsn0w from crashing due to the ever-growing ramdisk size.
TIP: When auto-detection fails and redsn0w tells you no identifying data as wound, you can always pre-select the appropriate 5.0.1 IPSW using “Extras -> Select IPSW”
Download Redsnow 0.9.10bc5
Navigate to our official download section do download redsn0w - the latest & updated version