This is a tutorial on how to perform an untethered jailbreak of your iPhone 4 on 5.0.1 using RedSn0w for Windows. The same steps for Mac version.
This procedure will cause you to upgrade your baseband. For those how rely on an Unlock must stay away from this and update using a custom ipsw.
Update #2: Redsn0w 0.9.10b4 released to address the iBooks issue for jailbroken devices.
Update #1: The b3 version of redsn0w fixes a problem where re-running redsn0w over an existing jailbreak would cause MobileSubstrate-based apps to stop running until MS was installed again. Now you can re-run the redsn0w jailbreak step without worrying about that (but still remember to de-select the “Install Cydia” option if it’s already installed).
iOS 5.0.1 Untethered Jailbreak Using Redsn0w Step-by-step Guide:
Step 1: Download the latest version of RedSn0w and 5.0.1 firmware from links below. No need to download the 5.0.1 firmware if you are already on iOS 5.0.1
Extract the Redsn0w zip file by double clicking it.
Step 2: Connect your iPhone to the computer and launch iTunes.
- Select your iPhone from the list of devices on the left.
- Hold down Shift and click the Restore button. Navigate to the 5.0.1 firmware ipsw.
- Click the Choose button to continue.
- iTunes will now update your iPhone to the new firmware.
Step 3: Launch the redsn0w application (As administrator)
Step 4: Once RedSn0w opens click the Jailbreak button
Step 5: Plug your iPhone into the computer and make sure its OFF then click the Next button.
Step 6: RedSn0w will now guide you through the steps to get into DFU mode.
Step 7: Your iPhone will now reboot
Step 8: RedSn0w will now prepare the jailbreak data.
Step 9: Select Cydia from the list of options and click Next.
Step 10: Your iPhone will now be rebooted again and RedSn0w will begin uploading the new RAM Disk and Kernel.
Step 11: Your mobile is now jailbroken with Cydia on the SpringBoard.