Apple released the 6.0.1 version of iOS only a few weeks ago to squash a few bugs that plagued the iPhone 5. The release was also available for older iPhones, iPods and iPads. Unfortunately the jailbreak scene on iOS 6.0.1 is pretty grim at the moment, with only a tethered option available so far. For a proper untethered jailbreak you will need to downgrade iOS 6.0.1 to 5.1.1.
Fortunately though there is a way to downgrade iOS 6.0.1 to 5.1.1 for those looking for an untethered jailbreak. The method below is only for older iOS devices, running A4 or below chipset. Which means newer devices like iPhone 5, iPad 4 and such are out.
Step 1- Download Redsn0w for Mac or Windows.
Step 2- Download the necessary IPSW for the device you’re using.
Step 3- Extract redsn0w.zip and run the redsn0w file
Step 4- Navigate to Extras -> Even more -> Restore and choose the IPSW for your relevant device.
Step 5- If you rely on ultrasn0w for software unlock, click Yes when prompted with ”Prevent Baseband Update?”
Step 6- Follow the steps to enter DFU mode.
Step 7- When in DFU mode redsn0w will scan Cydia to locate iOS 5.1.1 SHSH blobs.
Step 8- Wait for the process to finish.
When it’s finished you will have downgraded iOS 6.0.1 to 5.1.1 on your iDevice.