Great news iPhone3G and iPhone3GS unlockers! iPhone Dev Team announced that iPad's 06.15 baseband on the iPhone 3GS and iPhone 3G. now can be downgraded.
Check the tutorial after the break.
iPhone Dev Team updated their jailbreak tool redsn0w to v. 0.9.14b1 with ability to downgrade 06.15 baseband on the iPhone 3G or iPhone 3GS.
From Dev Team Blog:
Typically youd 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:
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 doesnt hurt for them to do it too).
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!
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, youll eventually get to the "Flashing Baseband" step. THIS STEP TAKES A VERY LONG TIME to complete and there wont be any feedback while its 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 baseband is not compatible with 3GS units manufactured week 34 of 2011 or later. If you have an iPhone3GS 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!
You can download latest version of redsn0w from iPhone Dev Team Blog.via
thanks @Professor for the tip
[Read the original blog post]