iOS users are always tempted to update their devices whenever they see Apple releasing a new firmware version. However, those who’re on untethered jailbreak lack knowledge that upgrading to new firmwares will result in loss of the jailbreak, until a jailbreak team comes out and releases on for the latest firmware.
Those of you who’re considering for updating to iOS 6.1.3, this post will cover a detailed insight on this particular which will help you make a decision whether to upgrade or not.
How to revert back from iOS 6.1.3 to iOS 6.1.2?
It’s important to know the new features of a newly released firmware because it may be a possibility that new offerings aren’t worth of losing a jailbreak in the process. According to Apple, iOS 6.1.3 brings some improvement for Maps in Japan and also features a patch for a bug that has been widely reported.
A support document was also posted on Cupertino’s official website, revealing that this firmware addresses security flaws, one of which is the vulnerability of the passcode lock.
According to the description, anyone who can physically access the device may bypass the lock screen because there was an issue when receiving emergency calls. The new lock state management iOS 6.1.3 brings fixed this problem.
Another threat was that anyone with physical access can change arbitrary file permissions. Apple said when making a restore from backup, certain files had permissions modified by lockdown even if there was a symbolic link present, by the problem was addressed by now allowing the symbolic link to change.
A kernel issue was also present previously, which was toggled by an issue of information disclosure present in abort handle, which can allow a user to find out the structure’s address of the kernel. This issue was catered by the abort context not calling the AMD frefetch abort handler.
As can be seen from all these details, a number of security improvements have been made for iOS 6.1.3. However, if you’re currently on iOS 6.1.2 with an untethered jailbreak, you shouldn’t upgrade.
Why you shouldn’t upgrade to iOS 6.1.3 if you’ve an untethered jailbreak?
The reason why you shouldn’t upgrade is because untethered jailbreak is currently not available for iOS 6.1.3. As soon as you go for the update, you’ll lose your untethered jailbreak in the process because evasi0n, the popular jailbreak tool released by the evad3rs team is not available for this said firmware.
You should also be aware that anyone claiming to sell you an untethered jailbreak for iOS 6.1.3 is trying to take away your money because there hasn’t been any official announcement from a jailbreak team that it has been jailbroken.
If you really want to update to iOS 6.1.3, we recommend saving SHSH blobs
You should note that TinyUmbrella, the popular tool to save SHSH blobs, is compatible with iOS 6.1.3. The firmware patched many jailbreak exploits used in evasi0n, but by saving SHSH blobs through TinyUmbrella 6.13.00, you can expect a good and easy jailbreak in future when the evad3rs team releases one. The saving of SHSH blobs is pretty handy when trying to downgrade any lately releases firmrware version to a previous one.
If you don’t know how to save SHSH blobs, here is a step-by-step guide for you:
Download the latest version of TinyUmbrella for Mac, Windows or Linux on your desktop.
Double click on the downloaded file to start the installation process.
Connect your iDevice to the computer with the help of a USB cable.
At the top left corner of the screen, select the device you’re using.
Select the tab that says ‘Advanced’ and uncheck these options: ‘Save All Available SHSH’ and ‘Request SHSH from Cydia’.
Now create an ‘SHSH folder’ on the computer and make a ‘dedicated directory’ for saving SHSH blogs’. This will help you in future when you’re trying to find where you backed up the blobs.
Select ‘Log Tab’, which is going to show the SHSH blob saving attempts made earlier.
Now select ‘save SHSH’, and TinyUmbrella will start the process, saving them to the directory made in step 6. If you did everything correctly, a message saying ‘SHSH successfully saved’ will be presented to you.
After the process is complete, go to the folder made in step 6 and check for saved SHSH blobs. Also make sure that the firmware version and the model of your device is correct on the blobs.
Note: This guide is only for iOS 6.1.3 and doesn’t back up the SHSH blobs that you save previously. However, you can leave the options checked in step 5 if you want that to happen. You can also add further security to saved SHSH blobs by saving them to the cloud, because the computer can malfunction at any time.
If you’ve already updated to iOS 6.1.3, wait for iOS 7 jailbreak
If you’ve already updated your iDevice to the latest firmware, all you can do at the moment is wait for the release of iOS 7, because that is the time given by jailbreak teams to bypass the patched exploits that Apple made in in iOS 6.1.3.
Furthermore, don’t believe any of the services trying to sell you a jailbreak for iOS 6.1.3. Many of them also appear on front page results and in newspaper publications, which makes them appear trustworthy.
However, most of them are charging a good amount of money for providing the service. The original untethered jailbreak has always been free whenever it has been released for a particular firmware, and it’s going to remain free in the future as well, so you’re advised to stay away from anyone claiming to offer the service.
Apple has already announced iOS 7 at WWDC 2013, and it will be releasing publically in fall. You can expect the iOS 6.1.3 untethered jailbreak in near future. Until then, stay away from updating if you’re on iOS 6.1.2 and want to hold the jailbreak and stay away from scams if you’re already on iOS 6.1.3 and want an untethered jailbreak.