-- Downgrade 4.3.4 to 4.3.3, 4.3.2, 4.3.1 - iPhone 4, 3GS, iPad 1, 2, iPod Touch 4 --

[krunal2525]

Tested Tutorial Apple has released iOS 4.3.4 for iPhone, iPod touch, iPad and Apple TV 2G to patch PDF hole founded be Comex and used to jailbreak iOS devices with JailbreakMe 3.o. Now, if you have saved SHSH blobs for iOS 4.3.3, 4.3.2 or 4.3.1, you will be able to downgrade from iOS 4.3.4 to anyone of them.

Note: iPad 2 (3G models) are not supported on this tutorial as its baseband can't be downgraded so far.

Step 1: Download the required IPSW file to which you want to downgrade to, the links are given below for your convenience:

• iOS 4.3.3
• iOS 4.3.2
• iOS 4.3.1

Step 2: Once you’ve downloaded the required IPSW file, its time you put your iPhone, iPad or iPod touch into DFU mode. The steps are as follows:

• Connect your iPhone, iPad or iPod touch to your PC or Mac.
• Turn your device off.
• Now launch iTunes.
• Hold down the Power button and the Home button simultaneously for 10 seconds.
• After 10 seconds, release the Power button but don’t let go of the Home button, your computer should detect a new USB device.
• At this point, iTunes will also recognize your device, whether its an iPhone, iPad or iPod touch.

At this point, your device’s screen should be off, if that’s so, then you’ve successfully put your device in DFU mode. If iTunes logo shows up, you’re in Recovery Mode, NOT DFU mode.

Step 3: Here comes the tricky and the most important part, you’re going to fool iTunes into thinking that its in contact with Apple’s servers, whereas we’re going to change that to Saurik’s server. In order to do this, follow the steps given below:

Windows users:

Navigate to C:\Windows\System32\drivers\etc\ and locate the file named as “hosts”.

[IMG]http://1.bp.********.com/-2Gf0PE9o59o/TiC47JvhmhI/AAAAAAAAAeQ/5pS5e042JXE/s1600/01.png[/IMG]

Mac users:

Mac users can access the “hosts” file by navigating to “/etc/” folder, which can be found through Go > Go to Folder from within Finder.

[IMG]http://1.bp.********.com/-_C8LvLNvECs/TiC49fiuoDI/AAAAAAAAAeU/BEzJvhBGc2I/s1600/02.png[/IMG]

If you’re on Windows, then open the “hosts” file in Notepad. If on a Mac, then open the “hosts” file in TextEdit, and add the following line at the end:

74.208.105.171 gs.apple.com

Refer to the screenshot below if you’re having confusion:

[IMG]http://2.bp.********.com/-gun1h9Qfv_o/TiC4-07SeOI/AAAAAAAAAeY/xAfyxq6awUw/s1600/03.png[/IMG]

Just save the file and close Notepad or TextEdit, and you’re all set for the downgrade.

A quick note for Windows 7 and Vista users: Start Notepad with “Administrator privileges”, that can be done by right-clicking the Notepad app, and there you will see the “Administrator privileges” option, simply click and launch.

A quick note for Mac OS X users: While saving the host file on your Mac, you should have complete read and write privileges in order to make changes. Getting a permission error? A simple workaround is to copy the host file to your Mac’s desktop, from there make the changes in TextEdit, save the file, and copy it back to the original location, and replace the original host file with the one which you just created.

Step 4: Launch iTunes, choose your device from the left sidebar. Hold down the left “Shift” key if you’re on Windows or hold down the left “alt” key if you’re on a Mac and click on “Restore”, do not click anything else! A new window will pop up asking you for the location of the IPSW file.

[IMG]http://4.bp.********.com/-DazWVBfHjNw/TiC5AchToRI/AAAAAAAAAec/gGK4r1-6nxQ/s1600/04.png[/IMG]

Navigate to the desired firmware to which you want to downgrade to, in this case it can be either iOS 4.3.3, 4.3.2, 4.3.1, 4.3 or 4.2.1. Once you find the required IPSW file, click “Open” and let iTunes do its thing.

In a matter of few minutes, iTunes will install the version of iOS which you directed it to install. At this point you should see a progress bar on your device, everything is automated, therefore don’t do anything silly. Your device will reboot automatically when everything is done.

In some cases, iTunes will throw 1013 error, ignore it, its perfectly normal when downgrading. At this point, your device will be in Recovery Mode with your desired version of iOS fully installed.

[IMG]http://3.bp.********.com/-jA_tqrVeeOM/TiC5y9RW5qI/AAAAAAAAAeo/d32dhSElpdA/s1600/06.png[/IMG]

You should see a screen like the one below:

[IMG]http://3.bp.********.com/-ufoBDruH54M/TiC5BRFaUFI/AAAAAAAAAeg/Pb04a1PlbbY/s1600/04.jpg[/IMG]

Its quite simple to get out of Recovery Mode, simply down this nifty program called TinyUmbrella (Windows, Mac) along with Fix Recovery (Windows, Mac).

Once you’re done downloading TinyUmbrella, launch it, and then click on the “Exit Recovery” button. In a matter of seconds, your device will boot up normally.

[IMG]http://2.bp.********.com/-ecwFu1Gw9dI/TiC5C21QeBI/AAAAAAAAAek/vQP0-BS3wYg/s1600/05.png[/IMG]

Once you’re done with this, the last thing you’re going to do is remove the line you added to the “host” file in step 3, which is 74.208.105.171 gs.apple.com in order to receive updates from Apple’s servers normally.

[badsha007]

thanks sir its working....

[norrish]

does it work even if i didn't save the shsh blob?

[RotKT]

not working if SHSH not saved

[MYUNLOCKING]

not working for me

[GSM_MOHAMMEDIA]

not working for me too

[beling]

not working !!

ERROR 3194

[delux_gsm]

if you have .shsh file u do it
if you not have u can not downgread

[oxygene31dz]

wath do u mean friend ??? windows or mac ???

[jusmejose]

try to use sn0wbreeze i just downgraded iphone 4 4.3.4 to 4.3.3
or just downgrade to 4.1 it works for just done 6 pcs today..

[jusmejose]

Edit u might get error "1015" when downgrading to 4.1 and just use tinyumbrella and kick out of recovery mode and happy downgrading

Originally Posted by jusmejose

try to use sn0wbreeze i just downgraded iphone 4 4.3.4 to 4.3.3
or just downgrade to 4.1 it works for just done 6 pcs today..

[RotKT]

Originally Posted by jusmejose

try to use sn0wbreeze i just downgraded iphone 4 4.3.4 to 4.3.3
or just downgrade to 4.1 it works for just done 6 pcs today..

if you dont have SHSH saved, you CAN'T downgrade

[jusmejose]

Trust me with a different computer upgrade to 4.3.4 then downgrade to 4.1 it works for me* I have never saved my SHSH...

Originally Posted by RotKT

if you dont have SHSH saved, you CAN'T downgrade

[wmli]

if downgraded to 4.33.how to kick of recovery mode...get 1013 error

[RotKT]

Originally Posted by jusmejose

Trust me with a different computer upgrade to 4.3.4 then downgrade to 4.1 it works for me* I have never saved my SHSH...

i just tried again but got 3194 error