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How To Downgrade iPhone 3Gs from Firmware 3.1.3 to 3.1.2 1. find a file called ... iPhone Jailbreaking forum

  1. #1
    sooner's Avatar
    sooner no está en línea Stack Professional
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    Aug 2008

    How to Downgrade back to 3.1.2 from 3.1.3


    How To Downgrade iPhone 3Gs from Firmware 3.1.3 to 3.1.2

    1. find a file called “hosts” that manages connections to the servers:
    • Windows: go to C:\Windows\System32\drivers\etc\ and use a text editor to open the file “hosts”
    • Mac: open a terminal an type sudo /Applications/ /etc/hosts

    2. At this point we connect the server address to the IP address that corresponds to Saurik’s server instead of Apple. This way we can trick iTunes anxious to check the firmware saved through Cydia. To do this just copy this string and add it to the end of the file “hosts” that we have just opened:
    2.1 Save the file. Do NOT do a “Save As”. Close the file.
    2.3 In a new terminal window, paste in: sudo dscacheutil -flushcache .Hit return and type in your admin password.
    3. Now you can step into the real downgrade process of your iPhone 3Gs, but it will not be as easy as the previous times. First of all you need to put the iPhone in DFU then: Plug it into your computer and simultaneously press the Home key and the Power button for 10 seconds exactly, after issuing only the power button and continue to click on Home until iTunes will not recognized a new device in recovery mode.
    4. Your iPhone should have a full black screen and NOT the screen with iTunes icon and the cable. Many people confuse it with the DFU recovery mode but they are two very different processes, so before you continue, make sure you have the screen all black.
    5. Now click on the ALT key (MAC) / SHIFT (Windows) of the keyboard and the button “Restore” in iTunes, select the firmware 3.1.2 and wait.
    NOTE1: During recovery you may experience various errors.
    NOTE2: If you get ” unknown error (3002) ” error, you ddidn’t save your ECID on Saurik’s server and pretty much the downgrade cant take place. Luckily it was found an exploit in iPhone FW 3.1 and with a little bit of patience you might be able to perform the jailbreak directly on iPhone Firmware 3.1
    NOTE3: If you will get this error: ” The iPhone “iPhone” could not be restored. An unknown error occured (1015) ” , accept it, and re-do the entire process. ( put the iPhone into DFU mode, select iPhone FW 3.0 and wait ). The process will fail again and iTunes will return the same message as before “The iPhone” iPhone “could not be restored. An unknown error occurred (1015).Do not panic because it’s completely normal.
    To resolve this situation can proceed in two ways: The first relates to Mac users and is using iRecovery ( Mac and Windows ) to reboot the device, it will re-ignite in normal mode, the second title is “universal” because it works on both Windows and Mac and is ignoring the ‘error, continuing to work normally. Therefore, there can only start and run a regular Redsn0w Jailbreak Firmware 3.0
    You’re done. Now you are back on iPhone OS 3.1.2 and can jailbreak your iPhone. Of course, those of you that depend on unlocking the iPhone, you are screwed anyway, because by updating to 3.1.3 in the first place, you updated your baseband.

    iLord is DEAD!

  2. #2
    three3peat's Avatar
    three3peat no está en línea Stack level 3
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    Jan 2009
    So Im gonna need both firmwares ,, 3.1.2 and 3.0 to downgrade from 3.1.3

  3. #3
    Amigotek's Avatar
    Amigotek no está en línea Stack Professional
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    Mar 2007
    You are also going to need to have had a jailbroken iPhone and saved the signature file to Saurik's servers according to all the instructions I found. These also apply only to the 3Gs and do not downgrade the radio. If you have a 2G or 3G then you just need the correct 3.1.2 file for your iPhone. To downgrade the 2G or 3G just use the restore or upgrade buttons but press and hold the LEFT SHIFT key on a PC prior to clicking on the button. Once you click on it, a window should popup asking you what restore/upgrade file you want to use. Direct it to the correct location on your computer and let it go. Takes about a half hour or so depending on how much is on your iPhone and whether you did a restore or upgrade.


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