The Dev-Team had added support for iOS 5 GM to be recognized by redsn0w.
Before this release you could jailbreak iOS 5 GM but had to point redsn0w at the iOS 5 beta 7 ipsw. The Dev-Team has now quickly updated the jailbreak utility providing native iOS 5 GM support! Remember this is still a tethered jailbreak.
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
Update #11a: We’ve replaced the Windows version of 0.9.9b3 with 0.9.9b3a. The new version fixes a caching bug that affected only Windows users — point it one more time at your iOS5GM IPSW, and from then on you won’t have to point at it again.
As a special bonus to Windows users, we’ve made it so that if you make a copy of redsn0w.exe and name it something like “justboot.exe” (anything with the word “boot” in it), it will start up in “Just Boot tethered” mode. That way you don’t have to click on any buttons at all to boot tethered!
Here are the download links:
Source: Dev-Team Blog