iHackintosh

Jailbreak your iPhone

Downgrade iOS 4.3 for iPhone, iPad and iPod Touch

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Apple released iOS 4.3 beta with a lots of new features and bug fixes over 4.2.1, but we still don’t have any fully compatible jailbreak at the moment. So if you upgraded to iOS 4.3, and now you want to downgrade back to iOS 4.2.1 or 4.1, follow the instructions posted below to downgrade iOS 4.3 on iPhone 4, iPhone 3GS, iPod Touch 4G, iPod Touch 3G and iPad first generation to iOS 4.2.1, 4.1 or lower. Make sure you have saved your Cydia SHSH for the firmware you want to revert back.

downgrade-iphone

Note:

  1. This process is only for those who saved their SHSH to Cydia Server already.
  2. Read the whole process two-three times before starting the process.

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How to Edit and Save Hosts file in Windows

  • Open Notepad with Administrative privileges by clicking Start, All Programs,Accessories, and then right-click Notepad and select to open as Administrator.
  • Now browse to (C:/Windows / System32 / drivers / etc) in Notepad and open the hosts file, and add the following entry to the bottom of the file.

    74.208.10.249    gs.apple.com               <————

Now you navigate to files menu and save the hosts file. By doing this you changed the communication server from Apple to Saurik’s Server, because your ECID is on that server. Now you can put your iPhone in DFU mode to restore back to to OS 4.0.1 or lower. Follow our previous guide to Downgrade iOS 4.2 to 4.1 for iPhone, iPad and iPod

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How to Edit and Save Hosts file in Mac OS X

  • Navigate to Finder, Click to select Go to Folder… from the Go menu and Enter /etc into the input field and click the Go button.
  • Now look for hosts file, right click on hosts file and open with Text Edit, and add the following entry to the bottom of the file.

74.208.10.249   gs.apple.com <————

  • Now save the file and click on Save As.
  • Because Text Editor can’t save your system files, here comes the tricky part, in save as windows use the following settings, take a close look at the following image.

Uncheck the “ If no extension is provide, use .txt “ and then press the save button.

  • A host file will be appear on your Desktop, just drag and drop to /etc and follow the on screen instructions.

By doing this you changed the communication server from Apple to Sauriks Server, because your ECID is on that server. Now you can put your iPhone in DFU mode to restore to any of the previous OS. Follow our previous guide to Downgrade iOS 4.2 to 4.1 for iPhone, iPad and iPod

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Tags: Apple, downgrade, iOS 4.3, iPhone, jailbreak

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