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REDSN0W 8.1.2 HOW TO
REDSN0W 8.1.2 UPGRADE
REDSN0W 8.1.2 TV

In the future APTickets will completely replace SHSH blobs, this will happen once the iPhone 4S stops being supported. Unlike SHSH blobs which would submit the same one already stored on the server, a brand new APTicket is generated using a random string.

REDSN0W 8.1.2 UPGRADE

APTickets are much more secure however, because when you try to restore or upgrade your iPhone, iPod Touch or iPad a request is sent to Apple’s servers to confirm the APTicket. What APTickets are is essentially the next generation of SHSH blobs. In case this wasn’t a big enough limitation to downgrading iOS devices, in the iOS 5 firmware generation Apple introduced yet another technology to prevent downgrading called APTickets. What is happening is Apple refuses to generate the new hash during the downgrade, meaning the new SHSH blobs cannot be generated. If you try to restore to a lower firmware version, you will get an error because Apple is not signing that specific firmware version anymore.

In order to prevent firmware restores Apple only signs one firmware version at a time, which is obviously the latest firmware version available. Whenever you upgrade or downgrade your iPhone, iPod Touch or iPad, new SHSH blobs have to be generated because one of the parts to the SHSH formula is the firmware version. These blobs are essentially gatekeepers and control whether or not a firmware is restorable. On every device shipped by Apple a Plist file is present, this file contains SHSH blobs for different parts of the firmware. The device’s ECID, a unique identifier for every Apple device.

The firmware version being signed (example: 6.0.1).

The device model (example: iPhone 4 GSM).

Although this is getting technical, an SHSH is created by an SHSH formula with 3 or 4 TSS keys (say with me). In order to enforce this limitation SHSH blobs were introduced, which is a hash signature system. You see, when you restore your iPhone, iPod Touch or iPad through iTunes your device phones home and ensures that it is allowed to be restored to a specific firmware version. In the early days you could downgrade your iOS device to any firmware version you wanted to and not run into many troubles. This is because firmware restores never had to be approved by Apple, but starting from iOS 3.0 onwards Apple implemented a technology called SHSH blob.

REDSN0W 8.1.2 HOW TO

Note #2: We will be updating this page with the latest how to downgrade guides when new firmware versions are released, so make sure you come back soon!ĭowngrading your iPhone, iPod Touch or iPad to a lower firmware version is indeed possible, but unfortunately has become harder and harder over the years. Meaning you had to have saved your SHSH blobs for the firmware version you are trying to downgrade to, or downgrading will not work.

REDSN0W 8.1.2 TV

Note #1: This is not some magical section of guides that will allow you to downgrade your iPhone, iPod Touch, iPad or Apple TV 2G without having your SHSH blobs saved for prior firmware versions. Simply scroll through our How To Downgrade section for the firmware version you are trying to downgrade to, and read one of our easy to follow how to guides on downgrading your iPhone, iPod Touch, iPad, Apple TV or even PlayStation. Additionally, you will also learn the best way to save your SHSH blobs which will allow you to downgrade your iPhone, iPad, iPod Touch and Apple TV firmware version in the future. iOS 9, iOS 8, iOS 7, iOS 6, iOS 5 etc.) than the one you are currently running. In this section you will learn how to downgrade your iPhone, iPod Touch, iPad and Apple TV to a lower firmware version (e.g.