Yesterday iPhone Dev Team has released a new version of Redsn0w, which was native support for the final version of the operating system Apple. Redsn0w 0.9.15b1 not only jailbreaks iOS 6 devices on the chip A4, and installed automatically store unofficial Cydia applications and allows to downgrade from iOS 6 for iOS 5.
Redsn0w 0.9.15b1 now has a re-restoration option. Owners of third-generation iPad and iPhone 4S can reinstall any version of iOS 5.x, even if Apple stopped signing this firmware. To successfully perform the procedure, you must have previously saved certificate SHSH blobs for iOS 5.x and installed via iTunes firmware iOS 5.x. At this stage of downgrade for these devices running iOS 6 is impossible.
iPad 2 owners can downgrade from iOS 6 as long as the certificate iOS 4.x or iOS 5.x was saved prior to this process. iPhone 4, 3GS and iPod touch 4G users can also downgrade from iOS 6 firmware to iOS 5.x for untethered jailbreak (again if SHSH blobs). Detailed instructions can be found here. How to work with a snooze feature of Redsn0w 0.9.15b1 recovery.
Note: If you have installed the current firmware iOS 5.x on device using the OTA (over the air update), you can not use the recovery c iOS 5.x to iOS 5.x.
Step 2: Run Redsn0w 0.9.15b1 in Administrator mode, if you’re on Windows or make a click, hold down Ctrl, and select “Open” from the new menu, if you are a user OS X Mountain Lion. Go to the menu Extras.
Step 3: Open on Extras -> Even More in the main menu, then select Restore.
Step 4: Click the button and select the IPSW firmware file you want to restore.
Step 5: Redsn0w will warn you if you need additional firmware file. In this case, specify the desired program IPSW. At this stage Redsn0w will prompts you to connect to your computer.
Step 6: Now you need to specify the stored certificates SHSH blobs, which may be on your computer (unless you specifically save them) or remotely (using Cydia program automatically stores digital certificates on their servers).
After affirmation, Redsn0w will put all these information collectively, supply to switch iOS-tool into restoration mode and set up this model in your instrument.