iPhone 3GS with basebands 04.26.08 / 05.11.07 / 05.12.01 / 05.13.04 can be unlocked using Ultrasn0w. iPhone 3GS with basebands 05.14.02 / 05.15.04 / 05.15.04 / 05.16.01 / 05.16.02 cannot be unlocked with Ultrasn0w so they have to install iPad baseband 6.15.00 on their 3GS device which can be unlocked. That was the whole story.
Now we have seen a lot of iPhone 3GS devices using 6.15.00 baseband to get the unlock. Once they upgrade to this baseband, it cannot be downgraded back to any earlier baseband. Now the question is why would they want to downgrade 6.15.00 as they are enjoying the unlocked devices on it ? Well there are few issues with the iPad baseband installed on the 3GS devices and GPS not working is one of the main issue. This is where the dev team is working right now and looks like they are very close this team for real. They will be able to downgrade 6.15 to baseband 05.13.04 or earlier version which can be unlocked without any issues.
This is what iPhone Dev Team has posted on their blog:
The iPhone Dev Team is happy to announce a baseband downgrade option in redsn0w for those who are using the iPad’s 06.15 baseband on the iPhone3G or iPhone3GS.
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:
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 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.
- 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).
- 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.
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!
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