Falls dein iPhone bereits einen jailbreak hat, kannst du diesen mit der Version 0.9.9b6 auch ganz einfach aktualisieren. Wähle hierzu in redsn0w –> Jailbreak und entferne den Haken bei Cydia
From the Dev Team:
We’ve released version 0.9.9b6 of redsn0w, with both a functional fix and cosmetic fix for iOS5 jailbreakers. For iPhone3GS owners with the 06.15 baseband, this redsn0w eliminates the network crash you saw when using Location Services in iOS5 (in fact, you don’t even need to disable Location Services anymore during the initial setup). The cosmetic fix is to the visual countdown you see when going into DFU mode.
It’s okay to re-run this redsn0w over an existing device jailbroken at iOS5. Just choose “Jailbreak” again and de-select Cydia (in other words, all the checkboxes will be unchecked). If you are lucky enough to have an old-bootrom iPhone3GS, please pre-select the IPSW first (redsn0w can’t yet auto-detect the FW version of your old-bootrom 3GS if it’s already been jailbroken).
Redsn0w 0.9.9b6 doesn’t bring untethered jailbreak for iOS 5 or iPad 2 / iPhone 4S jailbreak. Supported devices are still the same.
For those who’re asking about the aGPS location services fix on iPhone 3GS, with this redsn0w: As the 06.15.00 baseband has “assisted GPS” (aGPS), so it’ll use things like tower triangulation in apps like Google Maps. The full fix will be available after the baseband downgrade.