Updating 2g iphone
Additionally, you will also learn the best way to save your SHSH blobs which will allow you to downgrade your i Phone, i Pad, i Pod Touch and Apple TV firmware version in the future.
Downgrading devices with the A5, A5X and A6 chip on the i OS 6 firmware generation is not possible at this time.Once you have your SHSH blobs signed, as stated previously, if you upgrade to a new firmware version and decide you don’t like it you can downgrade back to the firmware version which you have saved SHSH blobs for.There is unfortunately some restrictions that need to be kept in mind though.In order to enforce this limitation SHSH blobs were introduced, which is a hash signature system.Although this is getting technical, an SHSH is created by an SHSH formula with 3 or 4 TSS keys (say with me).Just like how Jailbreaking is becoming more and more difficult on newer Apple devices, so is downgrading.
As new exploits are constantly being found however, keep an eye on our list of how to guides shown below that will give you step-by-step instructions on how to downgrade your i Phone, i Pod Touch, i Pad or Apple TV to a lower firmware version.
For the most part, older i OS devices with an A4 chip can be downgraded to any firmware version as long as you have saved SHSH blobs and APTickets.
This includes the i Phone 2G, i Phone 3G, i Phone 3GS, i Phone 4, i Pad 1G, i Pod Touch 1G, i Pod Touch 2G, i Pod Touch 3G and the i Pod Touch 4G.
Whenever you upgrade or downgrade your i Phone, i Pod Touch or i Pad, new SHSH blobs have to be generated because one of the parts to the SHSH formula is the firmware version.
In order to prevent firmware restores Apple only signs one firmware version at a time, which is obviously the latest firmware version available.
On every device shipped by Apple a Plist file is present, this file contains SHSH blobs for different parts of the firmware.