Important Note:
iPhone 3G users can downgrade using the following guide. iPhone 3GS/4 and iPod Touch 3G usersmust have to ECID with SHSH. Saurik saved in the serverand modify the hosts file in order to succeed in the procedure see below:
Requirements:
-The latest version of iTunes.
-The original firmware which you intend to downgrade to it from here.
-iRecovery and libusb for Mac or EasyiRecovery for Windows.
Modifying the hosts file:
For Windows:
-Open Notepad with Adiminstrative privilages, click on Start > All programs > Accessories then right click on Notepad then select open as Administrator.
-Now browse (C:/Windows / System32 / drivers / etc) in the Notpad and open the hosts file then add the following line at the end of the document and save it:
74.208.10.249 gs.apple.comFor Mac:
-Click "Go" -> "Go to Folder" and enter the path / etc /
-Find the file "hosts" and move it to your Desktop.Open the file by right click then open with Text Edit and add this string at the end:
74.208.10.249 gs.apple.com-Save the file to your desktop and then drag it back into / etc / . We will request permission to overwrite and then also the administrator password.

How can i use iRecovery or Libusb? Is there any step-by-step guide to do the full downgrade? Thanks
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