Update #10: Version 0.9.9b2 has been released with fixes and enhancements related to: Verizon iPhone4 firmware detection, Fix Recovery, Stitching, and blob processing. If you encountered a problem with any of these in the b1 version, please try b2 and leave any feedback below!
Update #11: redsn0w has been updated to 0.9.9b3 to auto-detect iOS5 GM firmware. Remember: it’s still tethered for all devices except for iPhone 3GS with old bootrom. If you don’t use redsn0w to “Just boot†at power up, all jailbreak apps (and even some native ones like MobileSafari) will fail to launch.
If you already jailbroke the GM by pointing an older redsn0w at the beta7 IPSW, there’s no need to re-run the full jailbreak step again…just use this newer one to make the tethered boot easier
Link down RedSn0w 0.9.9 beta 2
Win
Mac
Link down RedSn0w 0.9.9 beta 3
Win
Mac
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).
Here are the download links: