The iPhone Dev Team has quitely released redsn0w 0.9.9b4 which comes with some improvements for iOS 5 users. The 0.9.9 b4 version is made for those who want to test their own custom RAMDISKS using the -r command line option. In case you’re one of them, you will have to use the below commands mentioned on the Dev Team blog.
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).
For those who wants to jailbreak iOS 5 GM on all devices tethered using the new redsnow 0.9.9b4, you can head over our previous guide posted here and follow the steps but use the below download links of redsn0w 0.9.9b4.
Download Redsn0w 0.9.9b4
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