Jailbreak, Unlock iPhone 3GS on Firmware 3.1 OS on Windows

This guide will help you in running fully unlocked and jailbroken iPhone 3GS with firmware 3.1 on a Windows PC.

NOTE: This guide is for those of you who are on a jailbroken iPhone 3GS firmware 3.0 or 3.0.1. If you have updated to iPhone 3.1 from iTunes but have saved your SHSH file to Cydia then you can still jailbreak but you’ll first have to downgrade your firmware back to 3.0 or 3.0.1. In other cases, you are locked out.

First thing we need is Custom Firmware: Google for iPhone 3GS Custom 3.1 download or “iPhone2,1_3.1_7C144_Custom_Restore”, else download below:

Start the Download, as you read on: Link

Let’s  Roll:

Step 1: Preparing your iTunes

Launch your iTunes9.x (upgrade to latest), connect your iPhone and sync to backup all your data.

Once download of the required .ipsw file completes, Move it to the following location:

Windows 7:
“C:\Users\[username]\AppData\Roaming\Apple Computer\iTunes\iPhone Software Updates\”

Vista
“C:\Users\[username]\AppData\Roaming\Apple Computer\iTunes\iPhone Software Updates\”

XP
“C:\Documents and Settings\[username]\Application Data\Apple Computer\iTunes\iPhone Software Update\”

Now, Re-open iTunes,  you will be prompted to install the new firmware 3.1, DO NOT UPDATE from this prompt. Just close this dialog.

Step 2:  Restoring

Now, lets restore the 3.1 custom Firmware. To do this, press and hold left “Shift” button on the keyboard and then click on “Restore” (Not “Update”) button in the iTunes and then release the “Shift” button.

New window popsup asking you to locate your custom firmware. After selecting, iTunes will start decompressing and then will install. This is an automatic process, sit back and relax.

When it finishes your iPhone 3GS is unlocked and Fully Jailbroken.

Step 3: Syncing (optional)

Once you are done with the unlocking and jailbreak process. You can now restore all your settings, apps, music, contacts and photos to the newly installed firmware version 3.1 by restoring the backup that you made in Step 1 from iTunes.

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Troubleshooting: Follow this guide if you get any iTunes Errors 16xx (1601,1602, 1603, 1604)

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  • erik

    Everything worked got cydia and all but now i have no service?

    What did i do wrong?

    Is there any way i can just restore back to 3.0.1 and stay jailbroken on that os or am i screwed now?

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    • which iPhone you have?

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  • Pingback: How to Jailbreak, Unlock iPhone OS 3.1 on 2G, 3G on Windows, Mac()

  • top secret

    i can't find “iPhone Software Updates”??

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    • This happens when you have never updated any firmware in the past. Not a problem, create this directory manually, then place the file

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  • top secret

    my iphone is already locked.. I mean I can not see the button “Restore” or “update”; instead, I get “invalid sim card……”
    what shall I do?

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    • This should be easy. Enter iPhone recovery Mode (shutdown iphone. Hold HOME button, plugin USB cable to phone, keep holding home button, ur phone will enter restore mode saying “please connect to itunes”.) Then SHIFT+restore iPhone. You should be do it successfully

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  • top secret

    thanks… really helpful.
    Unfortunately, while restoring the iphone I got “error 1604” in itune 9.0.1??
    can you help me with this
    thanks a lot

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    • top secret

      Okay… i've solved it
      but after jailbraking and opening cyda and installing ultrasn0w I do not get any service signal

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      • zoubary

        tell me how plz im stuk my iphone is offf and im stuck in error 1604
        i have an iphone 3g

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  • apadigal

    Is this same can applicable to IPOD Touch?

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  • apadigal

    Is this same can applicable to IPOD Touch?

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  • Jayson

    hi i on OS 3.0 jailbreaked, how to i update to 3.1 using custom ware?

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