Downgrade iPhone 3GS Firmware 4.0.2 au 4.0.1 (No SHSH Blobs)



This Video will explain how to Downgrade your iPhone 3GS from firmware 4.0.2 to 4.0.1 without having its SHSH files saved. This method is not official so it does not work for everyone and all devices. It is tested! Choice A) You can try to restore in DFU Mode with Firmware 4.0.2 already modified for you –

Choice B) Steps to follow as Text: 1) Download your Firmware 4.0.1 – http://appldnld.apple.com/iPhone4/061-8618.20100715.Zapn4/iPhone2,1_4.0.1_8A306_Restore.ipsw 2) Change the file extension from .ipsw to .zip and then unzip the zip file with Winrar 3) Open the builmanifest.plist file with Notepad. Find all “8A306” and replace all with “8A400”. Save the file and do the same with restore.plist 4) Download Firmware 4.0.2 – http://appldnld.apple.com/iPhone4/061-8805.20100811.Dcr4e/iPhone2,1_4.0.2_8A400_Restore.ipsw 5) Change the file extension to .zip and open the file without extracting it with Winrar 6) Take all the files in the 4.0.1 folder and drag them into Firmware 4.0.2 (in the Winrar window opened previously). Save and change the extension to .ipsw 7) Open the Note Block as administrator, click on “File”, “Open” and navigate to C: Windows System32 drivers etc and open the hosts file. 8) Add the line 74.208.10.249 gs.apple.com 9) Put your iPhone 3GS in DFU Mode and then restore with iTunes NB It is likely that this procedure does not work for you so you will have to wait for the next Jailbreak for the Firmware 4.1 For any questions leave a comment or send an email to iphonethq@hotmail.com Regards, iPhoneTHQ 🙂 Source Cydia: http://apt.ipodtouchisapro.org/

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