After the release of iOS 6, the jailbreak situation got even more confused. There is no single methodology for everyone iPhone.
Each generation of devices has its own characteristics. It's worth knowing before starting the jailbreak process!
In order not to boggle our head with redundant information, let's see what redsn0w version 0.9.15b2 allows to do for each type iPhone.
iPhone 3GS
Untethered jailbreak iOS 6 is only available for iPhone with old bootrom. If you are fortunate enough to own one of the early models iPhone 3GS, you can now enjoy the benefits of an untethered jailbreak iOS 6 by downloading Redsn0w 0.9.15b2.
Tethered jailbreak iOS 6 for iPhone 3GS with new bootrom. If iPhone 3GS with new bootrom you will see the inscription – 'Tethered Jailbreak'. It means that it remains only to boot in the bound version or roll back to iOS 5.x
Determination of the bootrom version of the device in Redsn0w 0.9.15b2 occurs automatically.
Every time you restart your phone, you will have to connect iPhone to your computer and use the special function Redsn0w to put it into jailbreak mode. Without this, the device will not work.
Downgrade firmware (Downgrade) and untethered jailbreak iOS 5.1.1 for all iPhone 3GS. For iPhone 3GS it is possible to downgrade the firmware from iOS 6 to iOS 5.x, which will allow, in the future, to make untethered Jailbreak iOS 5.x. For any iPhone 3GS.
To downgrade, you must have saved SHSH blobs for iOS 5.x. Untethered jailbreak can be performed here iOS 5.x.
If you have a locked device, then any firmware change should be done through custom firmware. Otherwise, the modem will be updated and the ability to make calls will be blocked. Customize your firmware with RedSn0w. Checking unlock status
iPhone 4
Tied jailbreak iOS 6 for iPhone 4. Each time you restart your phone, you will have to connect iPhone to your computer and use the special function Redsn0w to put it into jailbreak mode. Without this, the device will not work.
It is important that if iPhone 4 is locked, then you need to update only while saving the modem firmware. Checking unlock status
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Downgrade firmware (Downgrade) and unlinked jailbreak iOS 5.1.1 for everyone iPhone 4. For downgrade, you must have saved SHSH blobs for iOS 5.x.
Untethered jailbreak can be performed here iOS 5.x.
iPhone 4S
Jailbreak iOS 6 not possible
Downgrade firmware (Downgrade) and untethered jailbreak iOS 5.1.1 for iPhone 4S. iPhone 4S (A5 chip) can be flashed to any iOS 5.x, even if Apple has stopped signing this firmware. To successfully complete the procedure, you must have previously saved SHSH blobs certificates for iOS 5.x and firmware installed via iTunes iOS 5.x. You will be able to untethered jailbreak iOS 5.x.
At this stage, downgrading for these devices with firmware iOS 6, unfortunately, is not possible.
How to Jailbreak iOS 6
If you are going to jailbreak yourself, then it is important to understand the key abbreviations and terminology well:
iOS (firmware) – operating system for Apple iPhone.
Activation – occurs after buying a phone or when upgrading / downgrade the gadget's firmware. The following happens during activation: some data about the device version is sent to the server Apple via iTunes to check the device in the database and to match the code.
Unlock is a “decoupling” from a certain operator.
Jailbreak (Jailbreak) – change the file system of the device, allowing you to use free (jailbroken) applications from the AppStore by installing them through Installous.
Cydia is a program designed to install applications iOS bypassing the AppStore.
Downgrade (rollback) – downgrade the firmware version (for example, rollback from iOS 6 to iOS 5.x).
Upgrade – upgrading the firmware version.
DFU mode (Device Firmware Update) – device mode for changing the firmware version.
Bootrom – part iPhone responsible for loading the firmware.
SHSH (Signature HaSH blobs) is, completely simplifying, a personal certificate (identifier) of your iPhone for iTunes, recognizing which iTunes allows the firmware, or, not recognizing it, prohibits ..
New features in redsn0w 0.9.15b2
- Does not require separate download and selection of IPSW file. The program automatically detects the OS version installed on iOS – device and downloads the necessary files.
- Will install Cydia on its own, at times, simplifying the jailbreak process for a beginner
- Downgrade support for A4 devices from iOS 6 to iOS 5.
- Re-recovery function.
- This version also adds the ability to hack and save the modem firmware (baseband) for iPhone 4 and iPhone 3GS.
- Support for rolling back modem 06.15 to version 05.13. Modem rollback works on iPhone 3GS and iPhone 3G. Now it is possible to roll back to version 05.13, restore normal GPS operation.
- iPhone 4 and iPhone 3GS – jailbreak support.
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