Downgrade 06:15:00 using RedSn0w 0.9.14b1 

Chronic Dev-Team member @Musclenerd just tweeted & released all Redsn0w 0.9.14b1 that Allows iPhone 3GS Users to Downgrade From 06:15:00 Baseband. iPhone 3GS users who updated their  Baseband to iPad’s 06:15:00 back then face multiple problems. One of the Major problem was that they were unable to downgrade to any prior Basebands & there was an issue with GPS location.

 

With Redsn0w 0.9.14b1; now  iPhone 3GS Users can Downgrade From 06:15:00 Baseband to 05:13:04 which ultimately solve’s GPS issues.

Be careful & read the instructions carefully to downgrade your baseband from 06:15:00

Instructions From Dev-Tream

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:

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 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!

Thanks very much to @dilbert4life for graciously loaning us his 3GS at 06.15 (we had no such devices because we always prevent BB updates!)

If you have any questions or comments, please use our comments section below!

Here are the download links.  Enjoy!

• redsn0w 0.9.14b1 (OS X)
• redsn0w 0.9.14b1 (Windows — run in Administrator Mode) “

 

Thank You to @Musclenerd & Dev-Team to Help 3GS users downgrade this baseband

UPDATE 1:

If you having trouble downgrading your iPhone 3GS’ baseband from 06:15:00using Redsn0w 0.9.14b1 that Dev Team is working for an updated version of RedSn0w. The Dev Team Hackers MuscleNerd  has tweeted that he may have found a solution to fix the problem.

MuscleNerd tweeted:

ok, figured out why some 3GS phones refuse the iPad downgrade! Can fix that after receiving another loaner (delivery expected on Thurs)

He goes on to explain why Redsn0w 0.9.14b1 is not working for some iPhone 3GS users:

it’s due to variations in the NOR chip. The payload can be changed to handle the differences but I need one in hand to test         

He has also confirmed that he will update Redsn0w to support all three variations of the NOR chip:

RCE of Apple’s 3GS flashers shows 3 types (2 very similar, but this 3rd is pretty different). Will change redsn0w to support all 3 

He has recommended iPhone 3GS users who have problems downgrading to wait for the Redsn0w update (Redsn0w 0.9.14b2), which should be released next week.