The Dev Team has released an update to their RedSnow utility, bringing it to version 0.9.14 beta 1. This new version allows iPhone 3GS users to downgrade their baseband version 0.6.15 to version 05.13.04, through which your device will have ultrasn0w compatibility and a normal iPhone baseband with full GPS and the ability to use stock IPSWs again.
For step by step tutorial on how to use this tool, head below for the official procedure provided by the dev team :-
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!”
Grab the tool from the download links below :-
Download RedSnow 0.9.14b1 (0.9.14 Beta 1) Windows [Direct Link]
Download RedSnow 0.9.14b1 (0.9.14 Beta 1) MAC [Direct Link]