Downgrading an iOS device is becoming harder than ever. In the old days, it used to be simple. All one had to do is download the older firmware and overwrite it. But now Apple has made it hard but we have the Dev Team on our side and with their redsn0w tool, downgrading to a lower iOS version is easily achievable.
The reason to downgrade is pretty obvious – for jailbreaking. The upcoming tutorial will help you to downgrade if you?ve saved the SHSH+APTicket. If you haven?t done so, then read no further as you?re out of luck.
How To Downgrade iOS 5.1.1 to iOS 5.1/5.0.1/5.0 (A4)
Step 2: Use iTunes/iCloud to back up your device?s data if it?s important.
Step 3: Open redsn0w and use a USB cable to connect the device to PC/Mac.
Step 4: Select Extras, and then tap on SHSH blobs > Stich.
Step 5: Choose the IPSW which you need to downgrade to, and then point the redsn0w tool to the .plist file that contracts the APTicket and SHSH blobs, if stored locally. If they?re stored in Cydia, you?ll see the option greying out but don?t worry, they?ll be available when you?re in DFU mode.
Step 6: Now enter DFU mode, tap on Cydia if the files mentioned in Step 5 are not stored locally, and redsn0w will save the new stitched IPSW file.
Step 7: Now enter the Pwned DFU Mode. To do this, go to redsn0w?s main screen, tap on Extras > Pwned DFU and just follow the instructions on-screen.
Step 8: Now point the hosts file towards Cydia?s servers in order to spoof the device into thinking Apple has authorized the process. Windows users should go to Windows > System 32 > drivers > etc while Mac users should go to etc. Now with any text editor, add the following line at the end of the hosts file:
Step 9: At last, open iTunes, hold down the left ALT key on Mac or the left SHIFT key if you?re on Windows. Tap the Restore button, choose the stitched IPSW file and restore. The process isn?t that long and after a while, you?ll be presented the old firmware of your choice.
The guide doesn?t work for users who have an A5/A5X device, since they are not vulnerable to Limera1n. Unlockers dependant on older basebands should create a custom firmware without the upgraded baseband with redsn0w for the firmware to be downgraded to. This is going to be the firmware file that you are going to point resn0w to in Step 5 and so on.
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