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

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

Posted June 18, 2012 at 8:22am 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 Windows. 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 (Windows)

Step Two
Launch the redsn0w application from the redsn0w folder we extracted earlier. You can do this by right clicking the executable and selecting Run as Administrator contextual menu.
How to Downgrade Your iPhone 3GS, 3G Baseband for Unlock (Windows)

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

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

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

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 (Windows)

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

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

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 (Windows)

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

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 (Windows)

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 (Windows)

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 (Windows)

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

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 (Windows)

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

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 (Windows)

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 (Windows)

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 (Windows)

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 (262)
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Apurva
Apurva - May 10, 2015 at 4:58am
I am on activation screen of 6.1.6 with baseband 6.15.00. The problem with these steps is that my power button doesn't work and so I created a custom IPSW of 5.1.1 as specified in https://www.iclarified.com/entry/index.php?enid=23009 for putting the phone in DFU mode. Will I be able to use that ipsw to put the phone in DFU mode and downgrade it as specified in this tutorial?
Zareef Hasan
Zareef Hasan - March 11, 2015 at 10:03pm
You can downgrade only if you have baseband version 06.15.00 (NOT 06.15.05 or like that). If you don't have that you have to first jailbreak with "Install iPad baseband" from redsn0w to get exactly 06.15.00. Then you can jailbreak with "Downgrade from iPad baseband" and then it will work! :)
EzequieL
EzequieL - October 24, 2014 at 2:12am
THANK YOU SIR! ITS WORK I WAS DOWNGRADE MY MODE FIRMWARE 6.15.0 TO 5.14 Thank you!
Biswajit Tripathy
Biswajit Tripathy - August 16, 2014 at 10:14am
Whatever I do I am unable to downgrade the baseband for my iPhone 3GS running iOS 5.1.1 from 6.15.00. Have tried all steps on all forums. Its been 4 days I have been trying continuously....
Doc132
Doc132 - August 2, 2014 at 8:32pm
for ios 6.1.6 you must use the ios 6.0 ipsw to get redsnow to read the ipsw. this worked for me hope it works for someone else !!
yunusemre
yunusemre - June 27, 2014 at 11:11am
me too gjg erroe
gjg
gjg - June 28, 2014 at 2:20am
i did a full restore
gjg
gjg - June 26, 2014 at 3:29am
Help pls... Error! Please reboot the device into normal operating mode, then perform a clean "slide to power off-
gjg
gjg - June 26, 2014 at 2:49am
what ipsw to use when i'm on ios 6.1.6 now?
gjg
gjg - June 26, 2014 at 2:41am
what ipsw to use when i'm on ios 6.1.6 now?
Arpith
Arpith - April 10, 2014 at 7:33am
My ophone struck on Rebooting...
Zia
Zia - April 6, 2014 at 3:44am
Redsn0w is not supporting "iPhone2,1_5.1.1_9B206_Restore". It says this version of Redsn0w doesn't support this. have iphone 3gs iOS 6.1.6 which i recently jailbreak but after the jailbreak it shows "no service" and in ICCID shows No SIM..Please help.. should i download some other version of firmware.?
Office Offline
Office Offline - April 6, 2014 at 6:12am
Just Install Ultrasn0w from cydia for your unlocking problems
jesan
jesan - February 25, 2014 at 9:31pm
i have to fix the no wifi problem while unlocking iphone 3gs
Arena
Arena - February 14, 2014 at 2:22am
For people having trouble unlocking their AT&T devices, you can check out attiphoneunlocking, they can unlock all AT&T device up to date
Weng
Weng - February 9, 2014 at 8:46am
is these error fixed??? unable to downgrade baseband due to error - dyld: code signature for shared cache failed with errno=7
Surya
Surya - December 18, 2013 at 8:47am
it replied me exploit failed.now what should i do.....?
BrySi
BrySi - December 7, 2013 at 9:27am
Hey I'm on a iphone 3G with 3.1.3 with ipad baseband. What should i do. Can't install 4.2.1 to do this process
Thuy Vu
Thuy Vu - December 3, 2013 at 4:30am
My iphone 3gs have problem with "no services" error. I have done step by step but can't still downgrade from 6.15 to 5.13. Its information: Version 5.1.1 (9B206) Model MC131B Serial 8700485Z3NP IMEI 012154000135252 ICCID NoSIm Firmware 06.15.00 When I check, my iphone is new boot room. Please help, Thanks,
JR
JR - November 6, 2013 at 3:45pm
Hello, This thing is stuck on Waiting for Rebooting...can anybody tell me how to get it fix? or maybe I should downgrade from firmware 6.1.3 to 6.1.2 and I would like to have the instruction how to do it. Thanks!
Alice
Alice - November 12, 2013 at 5:14pm
I had the same problem than you (with an iPhone 3GS, ios 6.1.3) and here is how I fixed it : before starting the downgrading process, you click on "Extras", then "Select IPSW" and choose the ios 6.0, even though you're in 6.1.3. Its because Redsn0w doesnt support the ios 6.1.3 so you're gonna trick it into believing that you're in 6.0. Once you've done that, (and you need to specifiy wether you have the old or the new bootroom), you can start downgrading your baseband as explained in this tutorial. And everytime you want to use redsn0w (for booting, or anything else), you have to do the same thing again : selecting the 6.0 ipsw. And it won't be stuck on "waiting for rebooting" anymore !
amit gupta
amit gupta - November 13, 2013 at 8:57am
which version of redsnow?
jr
jr - December 3, 2013 at 11:11pm
Thanks for your help, but Still no luck it just hang when it's loading the jailbreak it couldn't even get to the pineapple part. Don't know what else to do with this phone it's very frustrating.
Weng
Weng - February 9, 2014 at 8:44am
unable to downgrade baseband due to error - dyld: code signature for shared cache failed with errno=7
saun
saun - October 30, 2013 at 2:40pm
stuck in fetching baseband files........... help!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!
Peter
Peter - October 30, 2013 at 9:32am
Worked like a charm. Thanks
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