Alfred is a long-time teacher and computer enthusiast who works with and troubleshoots a wide range of computing devices.
If you have saved iPhone 4 shsh blobs with Cydia servers, you can downgrade or upgrade IOS firmware using Redsnow instead of iTunes. iPhone restore via iTunes is meant to happen smoothly but can be marred with plenty of errors since Apple’s authentication and verification procedures tend to get in the way thereby generating errors.
It is also no secret that iPhone firmware restore in old iPhones can cause its own share of headaches, more so if the firmware to be restored is no longer signed.
When Apple stops signing old firmware versions, restoration will not happen unless shsh blobs are used.
You can also restore iPhone firmware without iTunes, using Redsnow. Redsnow can query, submit and fetch shsh blobs, making it a better option especially when downgrading the IOS firmware.
Shsh, short for Signature HaSH, is actually the signature data from Apple servers which is used to identify and ultimately approve installation of IOS firmware in your iDevice. IOS firmware restore cannot take place without availability of shsh blobs. You must upload or have iDevice shshs blobs saved locally on your computer. This can be done via Redsnow or Tiny Umbrella.
Cydia servers have been designed to mimic Apple servers, and unlike Apple which only permits saving of the latest blobs for
How to Save iPhone shsh Blobs
In order to save your shsh blobs with Cydia, put your iPhone in DFU mode and click Fetch in Redsnow.
The process will be done in a short while and your files will be available remotely.
In order to find out what shsh blobs have been uploaded remotely, just click on the Query tab and within a short while, you should see a list of them. (see image below)
You can also save the shsh blobs in your computer if you so wish.
How to Restore iPhone 4 Firmware 6.0.1 Using Redsnow
For this demonstration, we shall use an iPhone 4 to restore firmware 6.0.1 up from 5.1.1, using Redsnow 0.9.15b3.
You should also have IOS versions 6.0.1 and 6.0 downloaded in your computer. IOS 6.0 will mainly apply for jailbreakers and those that wish to preserve iPhone baseband, when running Recovery Fix.
- The first thing is to power up Redsnow as computer Administrator.
- You will be presented with two tabs: Jailbreak and Extras.
- Click Extras and you should see more tab options in the next window.
- The last tab in the new window is named Even More.
- Click on it.
- You will then be served another window.
- Click on the fist tab named Restore. The Restore option enables Redsnow to install new firmware in your iPhone by using remotely saved shsh blobs or blobs saved locally on the computer.
- In the next window, click the tab IPSW and point to the iPhone 4 firmware 6.0.1 which you want restored.
- Redsnow may probably pop up a warning about not recognizing the IPSW but will allow you to continue.
- If you are a jailbreaker and/or probably want to prevent baseband upgrade you may want to select YES.
- If however your iPhone is factory unlocked you may pick any of the two choices.
- Upon making your choice, Redsnow will get busy identifying and fetching your shsh blobs from remote Cydia servers.
- Redsnow will automatically attempt to put your iPhone in Recovery mode.
- You may also opt to put your iPhone in DFU mode in case Redsnow prompts you to.
- Most often than not however, Redsnow will handle all business for you.
- The restore process will get moving and this should not last more than just a few minutes.
- You should now see the white Apple logo and a filling bar on the iPhone.
- When the bar fills up, the iPhone will reboot.
- Now, depending on how you configured the iPhone baseband option above, two scenarios will unfold.
- If you chose not to preserve your baseband - that is if your iPhone is factory unlocked, your iPhone should reboot normally.
- If however you chose to preserve your iPhone baseband, your phone will reboot to a screen displaying the iTunes logo and usb cable.
- If the latter is your situation, do not worry, for you have two ways out of this
- First, you can boot up fully by jailbreaking your iPhone.
- If you are not into jailbreaking however, you could simply use the Recovery Fix feature in Redsnow.
Using the Recovery Fix to Boot your iPhone
- First open Redsnow as Administrator and select the Extras tab.
- The next window will have a selection of tabs.
- Click the fifth tab Select IPSW tab and point to IOS 6.0.1 firmware. If Redsnow fails to identify 6.0.1, point to IOS 6.0. This will simply help boot up your iPhone. It will not change the firmware from 6.0.1 to 6.0.
- Now click on the third tab named Recovery Fix.
- Redsnow will prompt you to put your iPhone in DFU mode.
- If you are not good with DFU mode, simply press the POWER and HOME on the iPhone button until it is completely off and press Next.
- Redsnow will give you step by step instructions on how to enter DFU mode.
- If properly done your iPhone should now reboot and display the RAM disk image and finally the running Apple man!
- If you own a factory unlocked iPhone, follow the instructions on the screen and you should reach the home screen in no time.
- For unlockers however, you will first have to jailbreak your iPhone.