iOS developer NotCom previously announced that he had updated the jailbreak utility TinyUmbrella to version 6.00.00. This update came with extended support for Apple TV on iOS 5.0.2 and iOS 6.0 (including betas) for all supported iOS devices.
TinyUmbrella allows users to save their iOS device's SHSH blobs in order to downgrade iOS versions at a later date. Therefore, those who still haven't upgraded to the latest iOS 6 mobile OS jailbreak, or are thinking about getting the new jailbreak, need to download the new version of TinyUmbrella and save their SHSH blobs.
"I've updated TU for apple tv 5.0.2 (sorry for the wait!) as well as all of the iOS 6 betas. I've had to change the way the OSX app is packaged," NotCom stated in his blog post.
Even for users who have already accidentally updated their devices to the newest firmware, these backed up SHSH blobs will come useful in event of downgrading the firmware. Note that Cydia Blog disclaims that without these saved SHSH blobs, it will not be possible to downgrade to old ipsw to re-jailbreak the iOS device.
The steps to save iOS 6 SHSH blobs are as follows.
Step 1: Download TinyUmbrella v6.00.00b. Users can do that by following the links for both Mac OS X and Windows. (Mac OS X or Windows)
Step 2: Now connect the device to a PC or Mac via USB.
Step 3: Next, double click on the ".dmg" file to mount it, and drag the Umbrella app from the mounted dmg into the Applications folder. Once that is done, double click the Umbrella app to launch it.
Step 4: Users will be asked for to enter administrative username and password. Do the required and TinyUmbrella will then detect the type of device and its firmware.
Step 5: Click the "Advanced" tab and uncheck "Set Hosts to Cydia on Exit" and "Request SHSH from Cydia".
Step 6: Finally, hit the "Save SHSH" button and SHSH BLOBS for the latest iOS 6.0 firmware version will be obtained.
On completion of the steps successfully, users should notice a new entry in the Saved SHSHs for iPhone list that will confirm the backup. If the saved file contains 60k to 65k bytes of data, then the file should be fine and can be considered legit.
