iPhone 3GS: Return to OS 3.1.2 with Cydia SHSH hashes - Instructions for Windows | Unlock - Jailbreak 4.2.1 - 4.3

if one has previously deposited SHSH hashes in Cydia for his 3GS, which can be downgrade to 3.1.2 firmware. I translated the English-language guide to German. Before you, you should download from the Apple servers schonmal the original firmware 3.1.2.

Download OS 3.1.3 for iPhone 3GS (original Apple)

iPhone 3GS: Return to OS 3.1.2 with Cydia SHSH hashes - Instructions for Mac OS X

These instructions are for Mac OS X users to recreate you as you describe your iPhone to 3.1.2 can 3GS, with those deposited on Cydia BackUps the SHSH hashes.

This method also works if you want to recreate your 3.1.2 iPhone on 3GS, after her problems with a custom firmware created by sn0wbreeze you had (but only as long as you did not get a panic and you have done on a regular update to iTunes 3.1.3 ).

If you have already made a regular update via iTunes to 3.1.3, you will have no more sim unlock on your iPhone. The baseband of OS 3.1.3 is not yet fact entsperrbar.

The first condition for this method is that you previously backed up on Cydia for the OS 3.1.2 the so-called SHSH hashes have. So you can recognize it when you open cydia and the top is as follows: "This device has SHSHs on file for iPhone OS: 3.1.2" Then you have fulfilled the conditions for recreating on OS 3.1.2.

Next, you need to rewrite the so-called hosts file so that it connects to the server of Saurik, rather than with the original Apple server to digitally sign the firmware 3.1.2 to recreating. To do that you need you first download the program Smultron:

Download Smultron for Snow Leopard

Download Smultron for Leopard

Next, you need to go to the Apple Menu and Go to find.

Click on the button Go to folder.

Enter in the following field as follows: / etc / then click Ok.

Then rising in the window looking for the hosts file.

This will highlight and right click on Open With.

Others choose.

Find the previously installed program Smultron and select it.

The hosts file is now open at the end of the text:
74.208.10.249 gs.apple.com
Insert and close the file and save it.

Click then on authentication.

Enter your password in the box below and click on Ok.

Before it goes to the camp from now, the iPhone needs to be placed on the so-called widerherstellungsmodus. One way to do this is as follows:
The iPhone completely off and disconnect from the PC, open iTunes hold, then press the Home button and the iPhone via USB connected to the computer. As long recognized the Home button and hold until the iPhone in iTunes will widerherstellungsmodus.

Now, would it look in iTunes it with you like in the picture below. Then click Alt key while pressing the button in iTunes to recreate.