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How to Downgrade Your iPhone 3GS, 3G Baseband for Unlock (Mac)

How to Downgrade Your iPhone 3GS, 3G Baseband for Unlock (Mac)

Posted June 18, 2012 at 8:43am by iClarified
These are instructions on how to downgrade your iPhone 3GS or iPhone 3G's baseband from the iPad's 06.15 baseband to 05.13.04 using RedSn0w for Mac. The Mac version of this tutorial can be found here.

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 unlock compatibility and a normal iPhone baseband with full GPS and the ability to use stock IPSWs again.

Step One
Create a new folder on your desktop called Pwnage.


In the folder place the current firmware of your device (which can be downloaded from here) and the latest version of RedSn0w (from here).

Extract the RedSn0w zip file by double clicking it.
How to Downgrade Your iPhone 3GS, 3G Baseband for Unlock (Mac)

Step Two
Launch the redsn0w application from the redsn0w folder we extracted earlier.
How to Downgrade Your iPhone 3GS, 3G Baseband for Unlock (Mac)

Step Three
Once RedSn0w opens click the Extras button.
How to Downgrade Your iPhone 3GS, 3G Baseband for Unlock (Mac)

Step Four
Choose Select IPSW from the Extras menu.
How to Downgrade Your iPhone 3GS, 3G Baseband for Unlock (Mac)

Step Five
Navigate to the Pwnage folder on your desktop, choose the firmware ipsw we downloaded earlier, and click Open.
How to Downgrade Your iPhone 3GS, 3G Baseband for Unlock (Mac)

Click OK to confirm your selection.
How to Downgrade Your iPhone 3GS, 3G Baseband for Unlock (Mac)

Tell RedSn0w whether you have a newer or older model iPhone 3GS.
How to Downgrade Your iPhone 3GS, 3G Baseband for Unlock (Mac)

Step Six
Press Back to get back to the main menu then click the Jailbreak button.
How to Downgrade Your iPhone 3GS, 3G Baseband for Unlock (Mac)

Step Seven
RedSn0w will now prepare the jailbreak data.
How to Downgrade Your iPhone 3GS, 3G Baseband for Unlock (Mac)

Step Eight
Check the Downgrade from iPad baseband checkbox, uncheck Cydia if you already have it installed, and click Next to proceed through the normal DFU ramdisk steps.
How to Downgrade Your iPhone 3GS, 3G Baseband for Unlock (Mac)

Step Nine
Plug your iPhone into the computer and make sure its OFF then click the Next button
How to Downgrade Your iPhone 3GS, 3G Baseband for Unlock (Mac)

Step Ten
RedSn0w will now guide you through the steps to get into DFU mode. You can find more help with DFU mode here.
How to Downgrade Your iPhone 3GS, 3G Baseband for Unlock (Mac)

Hold down both the Home button and the Power button for 10 seconds.
How to Downgrade Your iPhone 3GS, 3G Baseband for Unlock (Mac)

Release the Power button and continue holding the Home button until RedSn0w detects the device.
How to Downgrade Your iPhone 3GS, 3G Baseband for Unlock (Mac)

Step Eleven
Your iPhone will now be exploited with limera1n and reboot
How to Downgrade Your iPhone 3GS, 3G Baseband for Unlock (Mac) How to Downgrade Your iPhone 3GS, 3G Baseband for Unlock (Mac)

Step Twelve
Your iPhone will now be rebooted again and RedSn0w will begin uploading the new RAM Disk and Kernel.
How to Downgrade Your iPhone 3GS, 3G Baseband for Unlock (Mac)

Step Thirteen
RedSn0w will now inform you that its work is done. The rest of this process will take place on your device.
How to Downgrade Your iPhone 3GS, 3G Baseband for Unlock (Mac)

Step Fourteen
After showing some scrolling text, your iPhone will display the pwnapple icon and say Flashing Baseband. 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.
How to Downgrade Your iPhone 3GS, 3G Baseband for Unlock (Mac)

Step Fifteen
Once the phone has rebooted you will be on the 05.13.04 baseband. You can then follow this tutorial to unlock!



***A big thanks to the iPhone Dev-Team for making this possible!
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Comments (60)
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MartinGrey
MartinGrey - October 21, 2016 at 12:29pm
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seff
seff - February 2, 2014 at 8:48am
somehow I managed to flash 06.15 baseband from 05.16 on my 3GS, but any attempt to downgrade 06.15 to 05.13 ends with a redsn0w message "the connected device doesn't support untethered options". any idea what could it be and whether there is any runaround would be greatly appreciated
Saad
Saad - January 23, 2014 at 3:14pm
i am using iphone 3G and it is not going to dfu mode and give some error on redsnow. I want to downgrade my baseband please guide me
vivek
vivek - April 30, 2013 at 10:19am
Hi I tried doing it. In the end it gives me an ERROR. "Please reboot the device in to normal operating mode. then perform a clean slide to power off. then try redsnow again. \ what do i do now? cant switch off or get out of this. please help.
fubar121
fubar121 - April 13, 2013 at 1:27pm
Great tutorial thank you for you hard work. How ever I can not get my 3gs to downgrade. I have tried just about every version of redsn0w with every possible firmware. currently stuck with iOS 4.1(8b117) with baseband 06.15.00 my phone is bell 3GS Model MC637C and serial 86023F0UEDG. Currently unlocked and jailbroken with redsn0w latest and ultrasn0w latest. I haave been pulling my hair out for a week now. I can reinstall the 06.15.00 with no issues and everything seems to work fine including the gps?? but when I try to downgrade redsn0w starts the exploit then crashes saying downgrade failed?? Anyone have any ideas?
ZoeSouls
ZoeSouls - February 19, 2013 at 1:54am
I'm having the same issue as Redtowner. I have a factory unlocked 3GS (serial ---947) with baseband 15.16.08 and want to downgrade my baseband back to 5.13 so I can get my imessage and picture messaging capability back and so my signal will stop spazzing. Anyone offer any advice?
ZoeSouls
ZoeSouls - February 19, 2013 at 1:59am
Forgot to mention that I'm on iOS 6.1.
redtowner
redtowner - February 14, 2013 at 1:08pm
i have a 3gs with baseband 15.16.07 will this be able to downgrade my baseband so i can unlock?
AppleMan12
AppleMan12 - January 9, 2013 at 9:29pm
OH! I DID IT! READ! I have an iPhone 3G on 4.2.1,SIM-Locked,ultrasn0w wouldn't unlock it...so i upgraded to 06.15 iPad's baseband,then,using the latest redsn0w version,i tried to downgrade from iPad baseband.After redsn0w did it's thing,iPhone rebooted and there was no baseband anymore!no cellular,no wifi,no bluetooth,imei,ecc So i tried other redsn0w versions,finally 09.14b1 was the one that worked!
koky
koky - October 30, 2012 at 6:29pm
Hi Grandpa, I ran my iPhone 3GS with OS6 and 05.16.07 using the latest Redsn0w_10.9.15b2 and iPhone2.1_6.0_10A403_Restore.ipsw per the above process but the phone would not downgrade and unlock. Am I using the correct files. Your assistance and advice is most appreciated. Thanks
locodo
locodo - October 28, 2012 at 4:45am
can some one help me my flash band thingy does not show... it just go straight to apple logo after loading jail break thingy... any help would be appreciate....
Mariel
Mariel - January 7, 2013 at 10:55am
That is very interesting. It prvediod me a number of ideas and I’ll be writing them on my web site soon. I’m bookmarking your site and I’ll be back. Thanks again!
mickymouse
mickymouse - October 3, 2012 at 10:32am
I have an iphone 3GS foreign, unlocked and activated with sn0wbreeze 2.9.5 firmware 5.1.1 BB 06.15.00. The phone unlocked with Ultrasnow from cydia .. the only problem is that GPS works poorly and above notifications are not coming, and this is the thing that penalizes more .. solutions? I tried SAM, fix push, push doctor but nothing .. if I downgrade the BB work out with notifications? the phone still work?
Esther
Esther - January 7, 2013 at 9:10am
Hola como estan?? muchisimas giarcas por su tiempo y por el que se han tomado para desarrollar tantos programas para el iPhone. El metodo funciona a la perfeccion! pero cuando hago el update hasta 1.1.3 no puedo activar youtube, me dice que lo haga por iTunes pero no se que hacer en iTunes para activarlo. Si conocen la solucion se los agradesco muchisimo. Una vez mas Gracias por su tiempo.
Jerry
Jerry - September 30, 2012 at 10:14am
I followed the instruction as listed. Did not get the Pineapple and still on 5.15 it did not down grade. What did I do wrong???? This phone is already JB on 4.2.1
shinepeter
shinepeter - September 29, 2012 at 10:27am
i was using locked 3gs jailbreaked. i have wrongly updated my ios to 6 and i cannot activate it. Can anyone help how to jailbreak again using redsnow/absinthe or any other way.
tHeSiD
tHeSiD - December 16, 2012 at 7:43pm
Get the latest version of redsnow, redsn0w_win_0.9.15b3 and don't select any ipsw, it will only detect it. I had 4.3.3 and 06.15.00 installed on my 3gs and I just checked downgrade the baseband and unchecked all other options and it works. hope it helps.
Manuel Brenes
Manuel Brenes - September 12, 2012 at 7:38pm
I'm not able to downgrade iPhone 3G BaseBand because redsn0w don't allow that, also 5.1.1 is not available for that model. Please help!!
iPhoney.Sr
iPhoney.Sr - August 31, 2012 at 5:07pm
Oh oh Thank you Thank you Thank you so much!!!! I did it with the redsn0w_mac_0.9.14b2 and it worked beautifully! (I never tried 0.9.14b1, I went straight to using b2) ;-) I was surprised I didn't even have to re-sync or anything, not even having to install ultrasn0w again. It just worked. Wonderful! I have had huge arguments with AT&T before (who turned out to have an illegal (!!) secret deal with Apple, and I talked to one supervisor after the other, and I threatened them to expose the illegal issues, since my husband is a U.S. lawyer - and since they admitted it (!) - but as i understand, you can now unlock with AT&T, so I'll call them again -- I'm a Swede btw so I need it unlocked). I am so very, very grateful. Thank you so incredibly much!
Grady
Grady - August 2, 2012 at 7:33pm
I have done this step by step, by my iphone 3gs never does the "flashing baseban" thing on my iphone...why?
Obolus
Obolus - July 28, 2012 at 6:13pm
For some reason I can't get any version of Redsn0w to recognize any of 2G ipsw files I need. I get an unsupported ipsw error.
Khasca
Khasca - July 24, 2012 at 2:49pm
For me aways have the same problem: USB connection problem! What i have to do!? Please help!!! :-/
BB
BB - July 22, 2012 at 6:21pm
The 615 Blues So I tried it again with redsn0w_mac_0.9.14b2, but I still get "Exploit failed". I could also not backup that log file that was suggested. iPhone: 3GS IOS: 4.2.1(8C148a) Model: MB716LL Serial: 5K9342 Locked to AT&T but unlocked by, i think ultrasn0w BB: 06:15.00 GPS: NO
Ali
Ali - July 12, 2012 at 5:25pm
Worked perfectly, downgraded from 6.15 on 5.11 and signal found.
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