Downgrade 06.15.00 Baseband to 05.13.xx on iPhone 3G [How to Guide]

[rahulk99k]

Most of iPhone 3G and iPhone 3GS users updated their baseband to iPad's one which is 06.15.00 to be able to unlock it. It's not possible to restore using stock firmware on iPad's baseband so you can downgrade to baseband 05.13.xx which is unlockable using ultrasn0w and you'll be able also to restore using stock firmware on this baseband.
Here’s what you will need:
- Jailbroken iPhone 3G
- Fuzzyband installed via Cydiaafc2add installed via Cydia
- i-FunBox (for Windows) or DiskAid (for Mac)
- Certificate to use with Fuzzyband.

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 Applications/Fuzzyband.app, right-click and then select Copy from PC.

STEP 5: Select the ICE2-06.15.00.cert file you downloaded earlier and then copy it to this location:Applications/Fuzzyband.app.

STEP 6: Now simply disconnect your iPhone from your computer and start Fuzzyband app (which you previously installed using Cydia) on your iPhone.

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 firmware without iTunes throwing errors.
source: Downgrade 06.15.00 Baseband to 05.13.xx on iPhone 3G [How to Guide]

[delchoni]

All that this iPad-ski baseband 06.15.00 have noticed that GPS-a does not work and have problems with the restaurant through iTunes, and updating / restaurants with original firmware.
Download now 06:15:00 05.13.xx to be possible only for the iPhone 3G with bootloader 5.8.

Here's what you need:

- Dzheylbreyknat iPhone 3G
- Fuzzyband installed from Cydia
- Afc2add installed from Cydia
- I-FunBox (Windows) or DiskAid (MAC)
- Certificate which will benefit Fuzzyband

1. Download the certificate you've put it here
2. Start Fuzzyband.
3. Connect your iPhone 3G to your computer via USB cable.
4. Run i-FunBox and click File and go to Applications / Fuzzyband.app, right click on it and select Copy from PC.
5. Select ICE2-06.15.00.cert file you've already downloaded it and copy it in Applications / Fuzzyband.app
6. Remove the USB cable and run Fuzzyband on your phone.
7. In Fuzzyband will see the version of the baseband, which is currently in use (6:15:00), but now you have the option to download to 05.13.xx. Select this option.
8. Sign in to settings / about to be sure it is removed baseband of 05.13 ... If all you have done correctly, you can now use Ultrasn0w to unlock and you to update or restaurants without any errors in Itunes.

[Ipko]

So this working only with bootloader 5.8 , in other not?
and did you test personally this solution mate?

Thank you:

[cipriutza]

Everything done until step 7, but in fuzzyband don't show the option to downgrade,
I verify the certificate is in the right place, simply doesn't work for my boot loader 06.04.

[SLIPLOCK]

i think this solution works only for 5.8 bootloader cause of sig check weakness.
Did you test on other bootloader? did someone ave solution for 6.4 BL?
thanks

[delchoni]

iH8sn0w, author of the program for Windows Sn0wbreeze said on Twitter, that is working on a tool that keeps SHSH for old firmware.

Release date for the instrument are not reported.



this a good news

[delchoni]

Great MuscleNerd (member of the Dev-Team) said today in his Twitter account that Geohot (George Hotz, iPhone hacker known) has a new dzheylbreyk tool and will be available only for devices ie A4 Processor 4 iPod touch, iPhone 4, iPad and Apple TV will be untethered. This is still neofitsialno, expect more information



On page GEOHOT does it becomes clear that the new instrument for djailbreyk probably will be called "Rubyra1n". Rubyra1n.com the URL domain is registered by GEOHOT still on March 27, 2010 is projected that djeylbreyk be untethered for iOS 4.2.1, but remains tethered to - new devices ...