How to Downgrade iOS 4.3 to 4.2.1, 4.1 on iPhone 4, 3GS, iPad, iPod touch [Guide]

follow the instructions posted below to downgrade iOS 4.3 to 4.2.1, 4.1 on iPhone 4, 3GS, iPad, iPod touch [Guide ].
Jan. 13, 2011 - PRLog -- Apple Has Released IOS From 4.3 To  IPhone 4, IPhone 3G, IPod 3G, 4G, And To IPAD Developers.If You Accidentally Updated Your Firmware To The New IOS 4.3, You Can Use The Following Guide To Downgrade Your Firmware Back To 4.2.1 Either IOS Or IOS 4.1

Keys To Be Noted

our Help Only Works If You Have 4.2.1 Or IOS IOS 4.1 Firmware Blob Stored SHSH
Step 1: Download the required IPSW firmware you want to restore on your phone.(Download links: iOS 4.2.1, iOS 4.1, iOS 4.0.2, iOS 4.0.1)

Step 2: Navigate to the path “c:windowssystem32driversetc” and open the hosts file in a Notepad or Wordpad. MAC users can navigate to the path “/etc/” and open the hosts file with TextEdit.

Step 3: Now add the following hostname at the end of the file as shown in the screenshot below. Save the file.

this Guide needs screen prints.i am unable here to add screen .you can check out full totrial at following link with excellent guide.

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Tags:: 3gs, Apple, Backup, Cell Phones, Developers, Downgrade, File, How To, How To Guide, Ios, Ios 4.3, Ios 4.3 Beta, Ios 4.
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