1. first make a modified 3.1.3 ipsw using the instructions provided here.
2. shift-restore on your itunes and use the modified firmware that you created.
3. you will come up with error 6 on itunes as shown by the image below.
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3a. then you phone will be in recovery mode as shown.
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4. now open ireb and press fix recovery loop, then choose iphone 3Gs.
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5. Now your phone will be back to normal as shown below.
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6. here's the screenshot of the phone with 3.1.3 version and 5.11 baseband.
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download ireb here.
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