As we posted, the Dev Team has produced RedSn0w 0.9.14b1 today. The updated edition of the most-known iPhone jailbreak software features the very-expected ability to downgrade 6.15.00 to 5.13.04 baseband for iPhone 3G / 3GS. Users with unlocked 3G / 3GS iPhones stuck on 06.15.00 ipad baseband are now able to downgrade to 05.13.04 baseband.

downgrade 6.15.00 to 5.13.04 baseband

How to Downgrade Baseband 06.15.00 to 05.13.04

If their iPhone’s baseband will be downgraded that mean that their GPS will be restored and their device with downgraded baseband will be supported with Ultrasn0w 1.2.7.

Downgrade baseband 6.15.00 to 5.13.04
iPhone 3GS

iPhone Dev Team’s release information:

“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:
Step 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).
Step 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!
Step 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!”

How to Downgrade Baseband 06.15.00 to 05.13.04 With Redsnow

Step 1: Download Latest Redsn0w.

Step 2: Start Redsn0w.

Step 3: Connect your iPhone to the Computer and Put it into DFU mode.

Step 4: Now click "Jailbreak", Select "Downgrade from iPad baseband", unselect Cydia in the event that you previously have installed it, Now click Next, and wait right up until you view the "Flashing Baseband" message.

Keep refresing UnlockBoot for more, soon we will post a video guide on how to downgrade baseband 6.15.00 to 5.13.04 using Redsn0w. For anyone who definitely are ready to begin, you can download Redsnow 0.9.14b1 from our Downloads section.

Any thoughts? — Hit the Comment section below!

  • dacatz


  • malgus216

    why the dev team cannot downgrade bb of iphone 4, but iPhone 3gs they can downgrade baseband?.

  • truebeleive

    i am in the progress right now have to be very patient but it seems fine on my 3gs so fare

  • Nikhil

    plz downgrade 4.12.01???????????

  • kabutu69

    @735eba3985b95da3006206e7a06c576d:disqus as of now there is no way to dowgrade iphone 4 bb ,because it has different procedure, read this, but musclenerd is now working in the iphone 4 bb. hopefully it will come out soon

  • truebeleive

    total success thanx thanx alot

  • dans

    xx206 bb 05.16.05, locked, what should i do? looks like this solution not for me, can i downgrade from 05.16.05 ? TY

  • Potapo

    Can I also downgrade with this soft modem 05.16.05 to 05.13.04? Or do I have to firstly instal iPad baseband and then downgrade? Thaks

  • Chris

    Hey, this is amazing :D, but one quick question, after i install ultrasn0w, i get this message/error saying ” Could not activate cellular data network “.. please help me, i reinstalled and did all the steps 😉

  • Robin Dumlao

    I don’t get it, do i use both steps? the one where i have to select IPSW and the How to downgrade steps also? I have an iPhone 3GS with BB 06.15.00 running iOS 5.1.1 and unlocked. Thanks!

  • Ricardo Oliva

    not working for me… ios 5.1.1 3gs oldboot. i’ve tried all

  • m0nsieur

    I would like to add that i had a 3gs that was messed up because the ipad bb was not compatible with that model yet i was still able to downgrade the bb to 05.13.04 😀

  • Oscar Pava

    I did the downgrade and it’s still on 06.15.00 baseband and no signal…what happen?

  • Pedros Aragosa

    Same result here. Tried to downgrade few times

  • H4CKER

    Download iOS 5.1 and reds now 9.10b6 thru Mozilla. Open redsnow go to extra go to custom Ipsw and select the downloaded iOS 5.1. It will creat the custom Ipsw. Now go to iTunes and back up your phone. Once backed up go to redsnow and put it in to sfumato mode from extras menu. Once in dfu mode open iTunes and press shift restore to select custom Ipsw. Once restored it will ask for official sim. Go to redsnow extra select Ipsw and choose ios5.1 downloaded. Now go back on redsnow and select jail break. Follow steps to dfu mode select cydia and download iPad baseband and hit next. Once jail broken and rebooted go to iTunes and on setup select from backup. Hope this helped. At least your ph would b able to unlock as long as your bb is 6.15.0. Hope this helped

  • H4CKER

    Sorry meant to say put it into dfu mode not ( sfumato mode). Hate auto correct sometimes

  • m2ira

    is it applicable for BB 05.16.05? please i need to know. thnks! 😀

  • SilentRabbit

    If you went through with the downgrade and end up still on 6.15 with no signal, all you need to do is reflash 6.15

  • Ivan

    Is it possible to downgrade 06.15 to 05.13 on ios 6.0? Pleeeeease, answer)

  • Noscivic

    i have a 3G iphone stuck on BB 06.15.00 running whited00r iOS 4.2, but in actuality its running iOS 3.1.3 and i’d like to know if i’d be able to use this downgrade method as well…thank you for your help in advance….

  • omar

    my mobile is always stuck on the downloading jailbreaking data and it doesn’t proceed to the flashing !! i’m connected to wifi…… please help

  • John JOhn

    stuck at fetching baseband files

  • Rajat Dhingra

    there is an errno=7 coming for me. Any solution if you get do write

  • Rajat Dhingra

    There is an errno=7 coming what is that? any idea

  • Rajat Dhingra

    I think it does not work for ios 6.1.3

  • Rob

    i try to do with iPhone 3gs ios 4.1 of the 17 week, 2010. my machine just frozze. did any one see the same?