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Go Back   GSM-Forum > GSM & CDMA Phones / Tablets Software & Hardware Area > iPhone ,iPod & iPad (Apple Inc. Products) > iPhone 4 / iPhone 4S

iPhone 4 / iPhone 4S iPhone 4 / 4S

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Old 01-01-2011, 16:08   #1 (permalink)
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Here’s How To Downgrade iPhone 06.15.00 Baseband to 05.13.xx (iPhone 3G Bootloader 5.


Here’s How To Downgrade iPhone 06.15.00 Baseband to 05.13.xx (iPhone 3G Bootloader 5.8 Only)


The following method will help you downgrade the baseband of iPhone 3G from 06.15.00 to 5.13.xx, which is unlockable using Ultrasn0w. This method will also enable you to restore your device on the official stock firmware using iTunes which was otherwise not possible on iPad’s 06.15.00 baseband.

This method currently only works with the iPhone 3G with bootloader 5.8. The procedure is fairly straightforward, however we would not recommend novice users to try this. We will also highly recommend you to backup everything on your device before following the procedure. Proceed at your own risk only.
Here’s what you will need:
And the step by step procedure is as follows:
Step 1: Download the required certificate file ICE2-06.15.00.cert from here.
Step 2: Install Fuzzyband from Cydia and start this app.
Step 3: Connect your iPhone 3G with computer via USB cable.
Step 4: Start i-FunBox and click File, then navigate to [COLOR=#0000FF ! important][COLOR=#0000FF ! important]Applications[/COLOR]/Fuzzyband.app, right-click and then select Copy from PC.[/COLOR]
Step 5: Select the ICE2-06.15.00.cert [COLOR=#0000FF ! important][COLOR=#0000FF ! important]file[/COLOR] you downloaded earlier and then copy it to this location: Applications/Fuzzyband.app.[/COLOR]
Step 6: Now simply disconnect your [COLOR=#0000FF ! important][COLOR=#0000FF ! important]iPhone[/COLOR] from your computer and start Fuzzyband app (which you previously installed using Cydia) on your iPhone.[/COLOR]
Step 7: In Fuzzyband, you will now see your current version of Baseband, (which should still be 06.15.00). But now you will have the option to downgrade it to version 05.13.xx.
Once you have downgraded, Go to Settings –> About, and scroll down to check your Baseband which should now read 05.13.xx (which is unlockable via Ultrasn0w). You can now also update or restore any [COLOR=#0000FF ! important][COLOR=#0000FF ! important]firmware[/COLOR] without iTunes throwing errors. [via iSpazio][/COLOR]


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Old 01-01-2011, 16:38   #2 (permalink)
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Thanks for this but is there any way of achieving this downgrade with the 3Gs and new bootrom?
I know the title says for 3G only with old bootrom but heres living in hope!
Mac.
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Old 06-17-2011, 17:44   #3 (permalink)
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6/17/11
have problem with 3G on bb 6.15.0 before was on 5.15.04 on IOS 4.2.1 jailbroken initially with redsnow 0.9.6b4 on IPSW 1.2_4.2.1_8c148 and with cidia did repo666 and coulnt unlock the phone so upgraded to 6.15.0 with redsnow 0.9.6rc16 on same IPSW and worked.
erased all data and afterwards in recovery mode, try to reboot and comes with code error 1015.
can anuyone help!
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Old 06-17-2011, 18:09   #4 (permalink)
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Quote:
with code error 1015.
Just open tiny umbrella and tick

kick recovery

try if its work

post result
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