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Go Back   GSM-Forum > GSM & CDMA Phones / Tablets Software & Hardware Area > iPhone ,iPod & iPad (Apple Inc. Products) > iPhone 4 / iPhone 4S

iPhone 4 / iPhone 4S iPhone 4 / 4S

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Old 07-16-2011, 07:56   #1 (permalink)
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Downgrade 4.3.4 to 4.3.3, 4.3.2, 4.3.1 - iPhone 4, 3GS, iPad 1, 2, iPod Touch 4G, 3G

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, 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”.

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

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.

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.

Note:- Many user Got 1013 , 1015 Error

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.

You should see a screen like the one below:

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.

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 in order to receive updates from Apple’s servers normally.
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Old 07-16-2011, 18:42   #2 (permalink)
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thanks.. and working......
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Old 07-16-2011, 21:58   #3 (permalink)
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u can downgrade iphone 4 4.3.4 to 4.3.3 normaly without tinny umbrela or any other program just restor your phone and it will working ..........tested by me
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Old 07-17-2011, 06:40   #4 (permalink)
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hi all,
i try today and no need change host.
at itune just press shift + restore very easy
try iphone 4 and 3gs already
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Old 07-17-2011, 09:18   #5 (permalink)
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this should not be work on iPad2 dude, you will stuck on recovery, and there is no fix for iPad 2 yet.
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Old 07-18-2011, 14:23   #6 (permalink)
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error 1013

tested and work !!!
thanks lots , very nice solution for error 1013 on iphone 4 os 4.3.3
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Old 07-18-2011, 16:17   #7 (permalink)
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I am trying to downgrade 3Gs but getting Error 20, anyone have a trick ???

thank you.
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Old 07-18-2011, 21:31   #8 (permalink)
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same problem ereur 20?????
if someone have idea thanks
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Old 07-18-2011, 21:52   #9 (permalink)
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dont edit your host file, no trick needed as apple is still signing 4.3.3, you can downgrade from 4.3.4 to 4.3.3 normal
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Old 07-18-2011, 22:13   #10 (permalink)
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my hosts file is

i jailbreak and unlock with redsnow and i try to install 4.3.4 and now canot come back to 4.3.3 or 4.1

allthe time when i downgrade i have error 20

do you have idea?
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Old 07-18-2011, 23:48   #11 (permalink)
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Originally Posted by mohit_kripalu01 View Post
...... ..........
Thanks for this. Work 100% with only this line in hosts. Also for exit recovery (error 1015) on 3gs, i use fixrecovery 43 , tinyumbrella gui don't work for me.
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