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 Downgrade iOS 4.3.1 to 4.3, 4.2.1, 4.1 on iPhone 4, 3GS, iPad 2, iPad, iPod Touch
Unread 03-25-2011, 05:12 PM   #1
lyje17
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Downgrade iOS 4.3.1 to 4.3, 4.2.1, 4.1 on iPhone 4, 3GS, iPad 2, iPad, iPod Touch

Apple today has released iOS 4.3.1 for iPhone 4, 3GS, iPad 2, iPad, and iPod touch 4G/3G. If you upgraded to iOS 4.3.1, and now you want to downgrade back to iOS 4.3, iOS 4.2.1 or 4.1, simply follow the instructions posted below to downgrade iOS 4.3.1 on iPhone 4, 3GS, iPod touch, iPad 2 and iPad 1 to iOS 4.3, iOS 4.2.1, 4.1, 4.0.x.

NOTE: This guide will only work if you have SHSH blobs saved for the respective firmware you downgrading to.





Step 1:
Download the required old ipsw firmware files. (Download links: iOS 4.3, iOS 4.2.1, iOS 4.1, iOS 4.0.2, iOS 4.0.1)
Step 2:
Put your device into DFU mode (not recovery mode).
  • Connect your iOS device to your computer.
  • Turn it off.
  • Start iTunes.
  • Hold Power and Home buttons together for 10 seconds or so.
  • Release Power button but keep holding the Home button until your computer recognizes a new USB device.
  • iTunes will now recognize your iPhone, iPad or iPod touch.
Note: Your iPhone, iPad or iPod touch screen at this time should be blank (black in color), if not, then you are most likely in Recovery Mode, not DFU mode.
Step 3:
Now trick iTunes into thinking that it is watching Apple servers, while in real, we are going to change the address to Saurik’s server. To do this:
  • Navigate to C:\Windows\System32\drivers\etc\ and locate “hosts” file.


Mac OS X users can get to “/etc/” directory by going through “Go –> Go to Folder” from Finder.




  • Open this “hosts” file in Notepad (for Windows) or TextEdit (for Mac OS X) and add this

Quote:
74.208.105.171 gs.apple.com
line as shown in the screenshot below:



Now simply save this file and you are good to go!

NOTE for Windows 7 and Vista: Start “Notepad” with Administrator privileges by right clicking on “Notepad” app, and click on “Run as Administrator“ option.
NOTE for Mac OS X: Make sure you have full read and write access on your account when you are saving the host file. If it still throws permission error, simply copy the host file to desktop, make the required changes, and then replace it with the original file in “/etc/” directory.
Step 4:
Start iTunes, click on your iOS device icon from the sidebar in iTunes. Now press and hold left “alt” (option) button on Mac, or Left “Shift” button if you are on Windows on the keyboard and then click on “Restore” (Not “Update” or “Check for Update”) button in the iTunes and then release this button.





This will make iTunes prompt you to select the location for your iOS 4.3, iOS 4.2.1 or 4.1 firmware file. Select the desired ipsw file and click on “Open” to restore your iOS device.

Now sit back and enjoy as iTunes does the rest for you. This will involve a series of automated steps. Be patient at this stage and don’t do anything silly. Just wait while iTunes installs the requested firmware on your iOS device. Your device screen at this point will be showing a progress bar indicating installation progress. Once done, it will reboot automatically.
Now in some cases while restoring to iOS 4.3, iOS 4.2.1 or 4.1, iTunes might throw 1013 error at you as shown in the screenshot below. This is normal, just ignore this error as the firmware has already been successfully installed on the device.





Incase of the above mentioned error, your iPhone, iPad or iPod touch will be stuck in Recovery Mode, showing that “Connect to iTunes” screen.






To exit your device from Recovery Mode, download this program called TinyUmbrella (
Windows/Mac). Run it and the click on “Exit Recovery” button. Your device will now restart normally.





That’s it, you should now be able to jailbreak and unlock your device on the older iOS 4.3, iOS 4.2.1 or iOS 4.1 firmware. You can follow our step by step guide
posted here to jailbreak your iPhone, iPad or iPod touch with Redsn0w on iOS 4.2.1 (or untethered with GreenPois0n RC5), or with Limera1n on iOS 4.1, or with PwnageTool on iOS 4.3 (Sn0wbreeze if you are on Windows) if you haven’t already.
Last but not the least, you must now remove 74.208.105.171 gs.apple.com line from the host file so that you are prompted for future updates from Apple via iTunes.


[via
RedmondPie]




Last edited by lyje17; 03-25-2011 at 11:27 PM.
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Unread 03-25-2011, 06:12 PM   #2
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Thanks for the guide
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Unread 03-25-2011, 07:54 PM   #3
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Tried it got error 1013. Did tinnyumbrella stuck at the apple logo.
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Unread 03-25-2011, 08:00 PM   #4
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blobs still needed?
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Unread 03-25-2011, 08:44 PM   #5
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i can't find the ipsw file on my windows. Is there something i'm missing?
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Unread 03-25-2011, 08:46 PM   #6
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Quote:
Originally Posted by Jcd6789 View Post
i can't find the ipsw file on my windows. Is there something i'm missing?
Yeah, probably downloading it first...
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Unread 03-25-2011, 08:54 PM   #7
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Yea i did that just cant find it
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Unread 03-25-2011, 09:12 PM   #8
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I'm sorry to sound noob. But do we need to go through all this? I thought TinyUmbrella could handle the job easily as before?
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Unread 03-25-2011, 09:42 PM   #9
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i want to downgrade to 4.0.1 as i am on 4.1 i4 now. but i dont have 4.0.1 shsh. HOW?
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Unread 03-25-2011, 09:47 PM   #10
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a million thanks!
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Unread 03-25-2011, 11:29 PM   #11
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i m on 4.2.1 jb with greenpoison and follow the instruction restore back to same ios but get error 3194....i have my shsh blob save via cydia and hang on recovery mode, use tinyumbrella to exit recovery but fail, keep stay in recovery mode... pls help......

Last edited by Wayne78; 03-26-2011 at 12:05 AM.
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Unread 03-25-2011, 11:32 PM   #12
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Quote:
Originally Posted by gonemad02 View Post
blobs still needed?
Read the sentence highlighted in red.

Quote:
Originally Posted by channelasian View Post
i want to downgrade to 4.0.1 as i am on 4.1 i4 now. but i dont have 4.0.1 shsh. HOW?
Off topic. Why downgrade? Something wrong with 4.1? Refer to the quote below:

If it ain't broken, don't fix it.
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Unread 03-25-2011, 11:46 PM   #13
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i have continuously been getting error 3014 even though i am following this guide to the letter.
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Unread 03-25-2011, 11:50 PM   #14
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I have an ipad I bought that has been upgraded to 4.3
So I dont have any original SHSH blobs. Am I reading Step 1 incorrectly. Does downloading one of these IPSW files account for not having a blob saved?

iPhone 5S 16GB ATT 4G LTE
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Unread 03-26-2011, 12:07 AM   #15
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Quote:
Originally Posted by maccumhaill View Post
Does downloading one of these IPSW files account for not having a blob saved?
Nope, you still need blobs.
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Unread 03-26-2011, 06:19 AM   #16
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hey guys i would like to downgrade my ipad from 4.3.1 to 4.2.1 issit posible? =] Thankyou! and yes i have my shsh saved.

Just a question…?

I cant seem to use tiny unbralla to kick me out of recovery mode, when i press exit recovery, it auto brings me back to the “usb > itunes logo” ?? how do i boot it up? the error is 1015.

Thanks!

Last edited by MrKami; 03-26-2011 at 06:21 AM. Reason: Add on.
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Unread 03-31-2011, 05:24 PM   #17
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I can't downgrade my iPad 4.3.1 to 4.2.1...i got '1015'...yes I have SHSH blobs...how t fix it?
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Unread 03-31-2011, 05:35 PM   #18
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"Last but not the least, you must now remove 74.208.105.171 gs.apple.com line from the host file so that you are prompted for future updates from Apple via iTunes."

I ACCIDENTALLY UPDATED PLZ HELP MA JAILBRAKE



---------- EDIT ----------

Quote:
Originally Posted by maccumhaill View Post
I have an ipad I bought that has been upgraded to 4.3
So I dont have any original SHSH blobs. Am I reading Step 1 incorrectly. Does downloading one of these IPSW files account for not having a blob saved?
You can jailbreak with Sn0wbreeze to 4.3.1 right now, although it is tethered it works fine. An untethered is to be released soon
If I helped you, hit the thanks button please.
You can follow my Twitter @Whited00r

For users with 'older devices ', try custom firmware from whited00r
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Unread 03-31-2011, 05:47 PM   #19
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how about 1015 errors??
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