Download Redsn0w 0.9.9b4 to Jailbreak iOS 5.The iPhone Dev-team released redsn0w 0.9.9b4 to jailbreak iOS 5 which will be released for public on October 12nd .The Redsn0w 0.9.9b4 version come with new improvements and it lets you test your own custom RAMDISKS using the -r command line option.
Redsn0w 0.9.9b4 full changelog:
Update #12: For those of you who experiment with your own custom ramdisks using the -r command-line option, version 0.9.9b4 adds auto-detection support for iOS5. This is needed because iOS4 and iOS5 treat the root partition differently (it’s encrypted in iOS5). redsn0w will now upload the correct iOS5 kernel by itself, but it’s up to your own launchd to determine if it needs to mount using the old or new partition scheme.
redsn0w now also accepts both native and img3-encapsulated versions of files you provide via the -r, -k, and -d command-line options (do redsn0w -h to show all the available options).