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iPhone Dev-Team Announces Baseband Downgrade for iPhone 3GS, 3G [Released]

iPhone Dev-Team Announces Baseband Downgrade for iPhone 3GS, 3G [Released]

Posted June 18, 2012 at 7:53am by iClarified
The iPhone Dev-Team has announced a baseband downgrade from the iPad's 06.15 baseband on the iPhone 3GS and iPhone 3G.

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.

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 proceed through the normal DFU ramdisk steps.

Note: The "Flashing Baseband" step TAKES A VERY LONG TIME to complete (3-8 minutes).

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!

RedSn0w will be updated to offer the new feature within the hour. You can follow iClarified on Twitter, Facebook, or RSS to be notified of release.

RedSn0w 0.9.14b1 has now been released. You can download it from here. Tutorials to follow shortly.


iPhone Dev-Team Announces Baseband Downgrade for iPhone 3GS, 3G [Released]
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Comments (31)
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1iphone - November 8, 2012 at 7:23pm
It worked for me..!!! I have 3gs - couple of months ago upgraded to BB 6.15 to do manual unlock/jailbreak.. Afterward AT&T started accepting unlock request and my request was granted. I wanted to do official unlock but after doing backup/restore with itune for 6.0.1 my phone was waiting for activation. It always give me message insert SIM card. I figured out that it was not able to understand SIM. Took it to at&t/apple - noone helped. At last I found this article and downgraded BB and what next... It worked finished unlock process from apple and now my iphone is officially unlocked.. Thans very much to!!!
fishka - December 19, 2012 at 6:06pm
Could you please describe the exact sateps that you took? I got the same problem that you han but am not able to resolve it.
arnold - July 2, 2012 at 3:19am
how about the iphone 4 baseband 04.12.01 ios 5.1.1???? hope to hear you soon!
praveen - June 21, 2012 at 5:29am
i have iPhone 3gs manufactured in 46th weak of 2009 on 5.1.1 i pad base band tried 3 times but it is still on 6.15.00. plz help
Jude - December 9, 2012 at 4:56pm
Did you manage to get things going. Please do let me know. Thanks
Lookme - June 20, 2012 at 11:08am
Good ! Mine 5 .13 now
hasanka - June 20, 2012 at 4:14am
if i downgrade my iphone baseband,can I upgrade to newly upcoming ios6 via itunes.
nino - June 19, 2012 at 9:29pm
wow this actually worked! i had a 3gs iPad baseband completely bricked and constantly rebooting every 5 to 10 mnts, and wifi and bluetooth blank and when going on settings the firmware was blank as well, i stopped trying a couple of months ago due to multiple tries but no luck, long story short i noticed this was out, i tried it TWICE and it worked!!!! i think you gotta try it twice because in order for the downgrade to work there has to be a firmware showing on the about section in the settings, so when doing it the first time it flashes it and the second time it fixes it and downgrades..... thank u muscleNerd!!!!! good luck everyone!
rilex0423 - June 19, 2012 at 7:30am
i trying on iphone 3Gs BB 6.15 is not working..
T_N_D - June 19, 2012 at 9:21am
dont work for me, need sutck ipad bb and no network... To fix this intall ipad bb and ultrasn0w again...
rilex0423 - June 21, 2012 at 4:02am
work only for 3G...
Praveen Rotawan
Praveen Rotawan - June 21, 2012 at 5:31am
same story
Miyuru_a - June 19, 2012 at 7:06am
Mine iPhone 3GS 5.1.1 bb 06.15.00 does not work...Pls help.. Want to unlock via ultrasn0w...thanks.
zardoz - June 18, 2012 at 4:46pm
Yes all working.. Also .. as it was out of contract .. got it unlocked also through a quick chat with at&T as i had a valid account
wenn96 - June 18, 2012 at 4:20pm
All went Ok. 3G 4.2.1 . Gps -looking for Gps Signal! Doesn't find Satelite! Any suggestions ?
mihais - June 18, 2012 at 2:40pm
Not working on 3GS with 4.1 and 06.15BB :(
Bob - June 20, 2012 at 6:56pm
same problem here, i have a 3gs running 4.1 unlocked through ultrasn0w with baseband 6.15.00 and all i get is " the connected device does not support untethered options"
Bob - June 20, 2012 at 7:01pm
So yeah someone please let me know on what can be done. And another question, do you have to uninstall ultrasn0w before trying this process to downgrade basebands?!
weboperater - June 18, 2012 at 12:30pm
I have a problem...its not downgrade bb, still on 6.15 bb but now I can not unlock with ultrasnow...any sugestion .....?
Me too
Me too - June 18, 2012 at 11:23pm
Mine doesn't work either. Restored to fresh "custom" 5.1.1, switched off, ran redsnow with downdrade enable.....still at 06.15. Now ultrasnow/ultrasnow 5.1.1 fix doesn't work either. It's a new bootrom phone btw.
asqwerty - June 19, 2012 at 5:44am
This is how it worked for me (3gs 5.1.1 bb 6.15). I made a new custom ipsw with sn0wbreeze (a non updating bb) and keep it at my desktop. Then I used redsn0w to downgrade bb as explained everywhere (tried 3 or 4 times until I got it). At this point I got a mess at my iphone but bb is downgraded. Then I put it in dfu and restore it with the custom ipsw. Install ultrasn0w fix first and ultrasn0w later. It works, at least for me.
vic - June 18, 2012 at 10:12am
Is there any chance to downgrade from BB 05.16.05 iOS 5.1.1 3GS iphone or unlock it?
Rui - June 18, 2012 at 5:08pm
any news about the BB? i have the same problem
Zeljko - June 18, 2012 at 9:26am
Thank you! 3G
weboperater - June 18, 2012 at 1:54pm
zeljko kako si uspeo...ja imam problem nece da mi spusti na 5.13.04 ...ostao na 6.15 ali sad nece da se otkljuca sa ultrasnow i fix-om ...?
Lamizana - June 18, 2012 at 8:57am
Any news on iPhone 4 bb 04.12.01 unlock, anyway thanks to your good works.
Rui - June 18, 2012 at 5:07pm
any news about the BB? i have the same problem
AppleMan12 - June 19, 2012 at 1:20pm
Yes,they confirmed iphone 4 software unlock via ultrasn0w.They are going to release it august 2015!
Phidol - June 18, 2012 at 8:42am
FINALLY!!! Thanks to the Dev-Team
noName - June 18, 2012 at 7:32am
Finally... the long wait is over.. Thanks to Dev-Team....
Martinarreolasegura - June 18, 2012 at 8:13am
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