How to – Downgrade iPhone 2G 3G OS 3.1.3 to 3.1.2 or lower

Earlier the Dev Team warned the iPhone users not to upgrade their iPhone to 3.1.3, to preserve their broadband and wait till the next version of Pwnage Tool. The reason behind this is that upgrading to 3.1.3 with Ultrasn0w/Blacksn0w will caused the iPhone users lose their unlock and will unable to get it back. The OS 3.1.3 has baseband 05.12.01 BB for iPhone 3G/3GS, and its firmware is not down gradable. Here is a guide through whom you can downgrade your iPhone, if you have updated iPhone 2G, 3G or 3GS to OS 3.1. One thing that should be remembered is that only firmware can be down gradable and not the baseband.

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Update for iPhone 3GS :

Until Dev team update Pwnage Tool or Redsn0w tool we recommend you to carry on with OS 3.1.3. The problem is that Apple has stopped signing 3.1.3 restore files, and so you cannot restore firmware other than 3.1.3 if you have iPhone 3GS. But if in any case you have already saved SHSH files on Saurik server through Cydia, to downgrade iPhone 2G and 3G follow the instructions bellow.

How to downgrade iPhone 2G and 3G:

Step 1:

First make sure you have latest iTune installed in your computer.

Step 2:

Now next thing is to turn your iPhone 2G/3G in DFU mode

  • Connect iPhone with your computer
  • Turn off your iPhone
  • Then for exactly 10 seconds hold “Power” and “Home” together.
  • Hold on to the home and release the power button until the computer beeps, it will recognize the USB device.
  • The iTunes will detect your iPhone after few seconds.
  • Now if you see the Restore Logo on the screen it means that you are in a recovery mode and not DFU.

Step 3:

Wait until your iPhone is in DFU mode, then a message will appear in iTunes;

  • Click on “OK”
  • Hold Option key while clicking Restore in iTunes
  • Browse OS 3.0 firmware for iPhone 3GS.
  • It will take about 10-15 minutes to restore.

Step 4:

You may come across certain errors like 1011, 1013, 1015, you don’t need to worry about them because the firmware 3.0 is already successfully installed, so you just need to ignore them. Now you can launch Redsn0w and jailbreak and unlock your iPhone. But if errors like 1600, 1601, 1602 occur or any other errors simply put your iPhone again into DFU mode and repeat the above procedure again.

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