September 26, 2023
How to Downgrade Your iPhone 3GS, 3G Baseband for Unlock (Windows)

How to Downgrade Your iPhone 3GS, 3G Baseband for Unlock (Windows)
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Posted June 18, 2012 at 8:22am · 263 comments · Add Comment
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
frengky
frengky - October 25, 2013 at 4:29pm
Hi, i need your help how to upgrade my iphone 3gs baseband 05.13.04 to ios 6.x after following those steps. Can it be unlocked ? Thx
justin
justin - October 25, 2013 at 3:46pm
i downgrade my iphone secussfully but it still showing no service
justin
justin - October 25, 2013 at 12:42pm
i do all of thes steps. but redsnow stucked in wating for reboot. what i can do now..
Viki
Viki - October 25, 2013 at 11:02am
for 6.1.3 users.. simply use 6.0 firmware and downgrade from ipad baseband.. and thats it.. then use ultrasn0w.. i have done it many times.. on some 3gs only baseband downgrading works and for some ultrasn0w works..
justin
justin - October 25, 2013 at 12:55pm
thank u so much now it is working
justin
justin - October 25, 2013 at 3:40pm
i downgrade my i phone secussfull but it still shwing no service
JR
JR - November 6, 2013 at 4:40pm
Can you please provide the instruction how to downgrade from 6.1.3 to 6.0? I've been trying to downgrade to 6.1.2 no luck.
ram12xc
ram12xc - September 22, 2013 at 8:58am
Hi guys, Thanks to each one of you for valuable comments and suggestions. For last 2 days I have been searching and trying desperately to bring my 3GS alive. I was trying to upgrade to 6.1. It was not able to search network. So I downgraded it to 5.1.1 (originally I had 5.0.1). But nothing was working. Seeing me sitting whole day over OLD 3GS, my wife threatened to throw my iPhone out of old window :) But finally I was able to crack it :) Following is what I did: - start with iPhone 3GS, 5.0.1 BB 6.15.00. old bootrom. - down load "redsn0w_win_0.9.15b3" and "iPhone2,1_5.1.1_9B206_Restore.ipsw" - Run redsnow with admin access - go to extras-> even more->restore->IPSW. - slect iPhone2,1_5.1.1_9B206_Restore.ipsw. click no on next screen.. - follow as redsnow suggests - iOS 5.1.1 is restored - When the update is completed don't do anything on the iphone. - go back and Click Jailbreak - Click Cydia - Click degrade iPAD Baseband - Click Deactivate - Next and make the procedures of holding the buttons - Wait for the Jailbreak - When the iphone is back again put the SIM CARD again. (it did not work for me, you can check, if it works, great. otherwise continue). - go back and Click Jailbreak- Click Cydia - Next and make the procedures of holding the buttons - Wait for the Jailbreak - When the iphone is back again put the SIM CARD again. And thats it.
Ri
Ri - October 19, 2013 at 10:39pm
ram12xc.. hi i have the same problem with my 3gs. my IOS now is 6.1.3 and i cant get any service Heres my Iphone info's Network: not available Version: 6.1.3 Carrier Not Available ICCID No Sim Modem Firm: 6.15.00 I would like to use the method you posted.. but i down know how to downgrade. Hope for your kind Reply. :)
raju www.airtet.in
raju www.airtet.in - September 17, 2013 at 3:53am
i successfully unlocked after downgrading base band 6.15 to 5.13 my signal appeared automatically which i earlier installed ultra snow can i upgrade to 6.1.3 with preserving baseband
Zouq
Zouq - September 3, 2013 at 1:45pm
Thanx alot its worked
Suresh
Suresh - September 14, 2013 at 6:33pm
Hi I am having the same issue with my 3gs, upgraded to IOS 6.1.3 with baseband 06.15.00. From cydia using ultrasn0w app tried to unlock my carrier, but no luck, reports No service / Searching... I am using 3gs with serial number 8493838X3NR. Can I now able to downgrade? if yes, Please advise. Thnks
MAV515
MAV515 - August 30, 2013 at 7:13am
correction: IOS = 6.1.3 BaseBand = 6.15
artureklondek
artureklondek - August 13, 2013 at 4:57pm
hi there i'm on 6.1.3 with ipad base 6;15 and cant downgrande becous tranfering control to jailbreak… dyld: code signature for shared cache failed with errno=7 this mean shsh ? any way to fix ?
Boldshsh
Boldshsh - August 22, 2013 at 5:12pm
Don't use 6.1.3. Downgrade to 5.1.1 and then downgrade baseband.
Luis
Luis - August 28, 2013 at 8:09am
Hi I am having the same issue with my 3gs old br I upgraded to 6.1.3 and still have Ipad baseband 6.15.00 and jailbroken with sn0breez all my apps work fine just that I cant get a signal for my carrier I also had it permanently unlocked to avoid this type of stuff. I have tried the tutorials for downgrade to 5.1.1 and cannot conclude the process I keep getting a transfering control to jailbreak... dydl: code signature for shared cache failed with errno=7 I can say I went by the tutorial various times with the same result. Please advise.
phil122955
phil122955 - July 22, 2013 at 1:44pm
i did the same thing but still with 6.15.00
goshgolly29
goshgolly29 - July 21, 2013 at 3:35pm
Thanks SOOOO much! It worked a treat :) Safari, email and maps don't work, but that's what chrome is for! Lol Is there a way to fix it by the way?
satishm
satishm - July 15, 2013 at 6:27am
hey after step ten i got an error SHSH blolbs ! can some 1 help me i'm using iphone 3gs
lilmaccy
lilmaccy - July 8, 2013 at 3:06pm
hey thanks for this greatly clear and simple tutorial ,, before i start doin this process i would like to have you clarify this point for me please ,, now my current version is 6,1.3 ,, is it possible to do that on it or do i need to downgrade it to 6.1.2??
Salman
Salman - July 6, 2013 at 5:22pm
Big Thanks, :D
vijay
vijay - July 5, 2013 at 11:24am
Thank you iclarified.com. I successfully downgrade from 06.15 to 05.13.04
bsabeso
bsabeso - June 28, 2013 at 2:35pm
i'v firmware 4.1(8b117) on baseband 6.15 and i want to upgrade the software but i can't because when i upgrade to ios 5.1.1 i will not have the signal to make calls, so what should i do can any one help me with this?
tony
tony - June 12, 2013 at 10:31pm
Hi. I had an iPhone 3g with an ipad baseband 6.15.00 and I want to downgrade to 5.13.04. I had followed every instruction show above. However, after the step Thirteen. my iPhone screen just a blue screen instead of pwnapple. Can someone tell me what's wrong and how to fix it? Thanks
tony
tony - June 12, 2013 at 10:30pm
Hi. I had an iPhone 3g with an ipad baseband 6.15.00 and I want to downgrade to 5.13.04. I had followed every instruction show above. However, after the step Thirteen. my iPhone screen just a blue screen instead of pwnapple. Can someone tell me what's wrong and how to fix it? Thanks
scott
scott - June 26, 2013 at 2:55am
I had the same blue screen issue with my 3G and tried the older b2 version of redsn0w and it worked!
Marco Pereira
Marco Pereira - May 28, 2013 at 1:32pm
Hi to All I have a Iphone 3G, with IOS 4.2.1 and firmware 05.15.04, and need to downgrade for ultrasnow. I need first, before do the downgrade from ipad baseband, I need to the INSTALL IPAD BASEBAND, correct? Thanks in advance
goqh
goqh - May 23, 2013 at 1:54pm
My iphone has ios 6.1.3 (10B329) with baseband 06.15.00. It doesn't have cydia (I use H2O which uses ATT line). Now I was trying to downgrade Baseband, because I wanted to get the IMEI unlock and to switch to Tmobile (gosmart). Can I simply follow the process described above? I am asking this because there are lots of confusing information about ios 6.1.3. (some people say nothing would work once I have ios 6.1.3. installed in my iphone.). thank you for your help.
Ismail
Ismail - June 6, 2013 at 8:35pm
My i phone 3GS ios 6.1.3 and BB 6.15.00 . Now my phone factory unlocked I just want to change my baseband . How it is possible , can you help me please..
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