downgrade iphone

Downgrade iOS 4.3.1 to 4.3 - 4.2.1 - 4.1 [How to]
SATURDAY, MARCH 26, 2011


Apple has released the final version of the iOS 4.3.1, not be released to fix some bugs of version 4.3 Many people now updated their devices while other, more hesitant to jailbreak or interested, they preferred to wait. In this post we will offer you the guide to downgrade from firmware 4.3.1 to firmware 4.3 or earlier, Just You Have to follow The steps below for all owners of iPhone 4 or iPhone 3GS upgraded to iOS 4.3.(Just stay Tuned for more downgrade Guides Facebook & Twitter )






You Will Need This
Firmware 4.3 (or earlier) saved on your computer, preferably on the desktop.
iPhone 3GS / 4 updated to firmware 4.3.1
iTunes 10.2.1
OS Windows or Mac OS X.
Certificates SHSH firmware 4.3, or earlier, saved
Before you must have amended appropriately on the host file. Here's how:

Windows Users
Open Notepad with administrator and click the right button and selecting the icon, then "Open as administrator".
Position yourself in the path C: / WINDOWS/system32/drivers/etc
Add this string to finder the file: 74.208.105.171 gs.apple.com
Close and save the changes


Mac Users
Using the Finder, navigate to the location / etc
Open the file "hosts" and enter the following string at the end of the document: 74.208.105.171 gs.apple.com
When you Finished making the changes, save the document to your desktop.
Now copy the new file in this directory Host (saved on desktop) overwriting the original
How To Guide

Step 1 :Connect your device to your computer and put it in DFU 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 2 :Once the iPhone is in DFU mode and will be detected by iTunes, click "Ok" and then select the firmware 4.3 to restore the iPhone software. To do this you must press and hold down the ALT key (Mac) and SHIFT (Windows) and then click on the Restore item. The reset takes about 10 to 15 minutes.


Step 3 :At the end of the process, iTunes may return an Error (1011, 1013, 1015). It is quite normal. Continue ignoring the error as the firmware 4.3 will also been installed on your device but you come into the so-called Recovery Mode Loop. You get out in various ways, including:
Using the latest version of RecBoot, available only for Mac;
Using the latest version of TinyUmbrella, available for (Windows / Mac)..
If you choose to use RecBoot you simply connect your iPhone to your computer, open programs and select "Exit Recovery Mode". The device will reboot and you have restored iOS 4.3 on your device. If you are using TinyUmbrella, you click on "Exit Recovery" at the top of the tab for the device connected to your computer.

If you have done all the steps correctly, the downgrade is complete and you have installed the firmware you want.

Remember to remove the string you just added to the Hosts file, otherwise you can not install future software upgrades.
Your iPhone will now reboot normally. You have now successfully downgraded iOS 4.3.1 to iOS 4.3, 4.2.1, 4.1 firmware. You can follow the normal guides to jailbreak. If you have downgraded your device to iOS 4.3, you can use either sn0wbreeze (for Windows) or PwnageTool (for Mac). iOS 4.2.1 or iOS 4.1
users can use :
Sn0wbreez Jailbreak 4.3 [How to]
GreenPois0n Jailbreak 4.2.1 [Win]
GreenPois0n Jailbreak 4.2.1 [Mac]
PwnageTool Jailbreak 4.2.1 [Mac]
Redsn0w Jailbreak 4.2.1 [Win]
Redsn0w Jailbreak 4.2.1 [Mac]
Sn0wbreez Jailbreak 4.2.1 [win]
Sn0wbreez Jailbreak 4.1 [Win]
Limera1n Jailbreak 4.1 [Mac]
Limera1n Jailbreak 4.1 [Win]