How to downgrade iPhone baseband 6.15.00 to 5.13.04

iPhone 3GS and 3G users having bb 6.15 should now jump with joy as iPhone dev team has released a newer version of Redsn0w i,e 0.9.15b3 that can be used to downgrade iPhone 3G/3GS baseband 6.15.00 to 5.13.04 with fixed GPS + ability to use stock iPSW again.

How to downgrade iPhone baseband 6.15.00 to 5.13.04

You can download Redsn0w 0.9.15b3 from our Redsn0w page. Here are the release notes as well as the steps to follow to successfully downgrade 6.15.00 baseband. Please note that you can downgrade on any iOs version including iOS 5.0, 5.0.1, 5.1, 5.1.1.

How to downgrade iPhone baseband 6.15.00 to 5.13.04

“The iPhone Dev Team is happy to announce a baseband downgrade option in redsn0w for those who are using the iPad’s o6.15 baseband on the iPhone3G or iPhone 3GS.

Typically you’d have the 06.15 baseband if you unlock with ultrasn0w but updated your iPhone baseband past 05.13.04. With this new capability, you can now downgrade specifically from 06.15 to 05.13.04 (even if you never had 05.13.04 on that device before). This gives you the best of both worlds: ultrasn0w compatibility and a normal iPhone baseband with full GPS and the ability to use stock IPSWs again.

Here are the steps:

1. Use the “Extras=>Select IPSW” button in redsn0w to tell it which firmware version you have installed (new-bootrom 3GS users can usually skip this step but it doesn’t hurt for them to do it too).

2. Do a controlled shutdown of your iPhone (“slide to power off”). This step is very important to avoid mount problems when the ramdisk is running!

3. Go back to the first screen and click “Jailbreak”. Enable the “Downgrade from iPad baseband” checkbox, disable Cydia if you already have it installed, and click Next to proceed through the normal DFU ramdisk steps.

After the ramdisk gets launched and you see the Pwnapple running on your iPhone, you’ll eventually get to the “Flashing Baseband” step. THIS STEP TAKES A VERY LONG TIME to complete and there won’t be any feedback while it’s running. Please just let it be for the next 3-8 minutes! When the ramdisk has done its job it will reboot the phone on its own.

For those who are wondering if you can update your 3G or 3GS to 06.15 solely for the purposes of downgrading to 05.13.04, the answer is “yes” for 3G owners, and “maybe” for 3GS owners. The iPad is not compatible with 3GS units manufactured week 34 of 2011 or later. If you have an iPhone 3GS and if digits 3-5 of its Serial Number are 134 or later (xx134…), then you should NOT try to install the 06.15 baseband on your 3GS! It will brick your radio, preventing both the downgrade from working and normal iPhone software from using it as a phone! Be warned!

That is it. If you follow the steps carefully, you will have downgraded iPhone back to 5.13.04 version which can be unlocked using ultrasn0w.

WARNING: If you are planning to flash iPad baseband 6.15.00 on your iPhone 3GS (iPhone 3GS 16 or 32 GB  made after week 35 of 2011 or a new 8GB iPhone 3GS made after week 28 of 2011) solely for the purpose to downgrade back to 5.13 version, DONOT ATTEMPT TO flash 6.15 baseband as it will brick your iPhone. Check your iPhone’s production week and year by going here.

Click Here To Get Your iPhone Unlocked Now – For Most Worldwide Networks

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