Now that Redsn0w 0.9.9b9 has been released, there is no longer a need for a 5.0 IPSW in order to jailbreak or tethered boot your device. This is great news for those who carry the files around with them in case they need to reboot tethered away from home. Now all you need is Redsn0w and an internet connection, no need for the bulky IPSW file! Redsn0w 0.9.9b9 also adds a bunch of other features but we will stick to jailbreaking for this tutorial.
Step 1: After downloading Redsn0w open it up and hit “Jailbreak”
Step 2: On the next screen, you will be instructed to shut off your device and prepare to put it into DFU mode. If you already know how to do the DFU process you can just enter DFU mode before hitting next. Otherwise, turn your device off, hit next and follow the on-screen instructions for putting your device in DFU mode.
Step 3: After Redsn0w detects your device you don’t need to do anything else, it will automatically detect what model you have, download the appropriate files needed for jailbreaking and exploit your device all automatically. Once the exploit is performed another screen will pop-up showing a few options. Select “Install Cydia.” The process will continue automatically once again and your phone will reboot once it’s done.
Step 4: Remember that this is still not an untethered jailbreak. Because of this, you still need to boot tethered any time your phone reboots or loses power. To do this either hit “back” to the main screen if Redsn0w is still open or just reopen if it’s not and this time hit “Extras.”
Step 5: Now hit the “Just Boot” option.
Step 6: Now you will be instructed to put your device into DFU mode again. This time after your phone reboots, it will boot to the springboard and Cydia will be fully functioning just like an untethered jailbreak.