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Thread: 3GS downgrade baseband 6.15
08-09-2012, 04:22 AM #41
Sounds like ya bricked ya phone
08-09-2012, 07:18 AM #42RE
any one can advice me how to downgrade my iPhone 3Gs 5.1.1, I update the baseband without checking the week 28 of 2011, there was any help ??
please let me know if I can get my phone back.
I already jailbroken, but I see no modem firmware no, Bluetooth sn nor modem firmware
any help again, for up to any iphone experience
08-09-2012, 07:27 AM #43
I done said what ya problem is. Ya phone is bricked. Try and restore it and see if it fixes it if not. There is no luck for ya.
08-09-2012, 07:30 AM #44
08-09-2012, 07:33 AM #45
Nope nothing really sorry.
08-10-2012, 04:59 AM #46
THIS POST. See if it works. I haven't tried it yet. It's worth a shot....
Last edited by Jabbacks; 08-10-2012 at 05:13 AM.
08-16-2012, 09:19 PM #47
I have an old 3GS that I have downgraded from baseband 6.15 to 5.13.04 successfully using redsn0w_win_0.9.14b2. However still no function from the GPS. It is great that I have at last managed to change the baseband so must be close now. Details are: Model – MC131X, iOS – 4.1 (8B117),SN – 86929...., Modem Firmware – 06.15.00 but changed to 5.13.04, Bootrom 359.3 (old Bootrom). There must be a mismatch in this somewhere. Should I try going to a higher iOS level?
08-17-2012, 06:58 AM #48
08-17-2012, 11:32 PM #49
Many thanks Evo. A bit tortuous but got there in the end. All up and running.
08-18-2012, 01:36 AM #50
08-21-2012, 05:11 AM #51Double checking before I start
Been reading the tutorials and this helpful thread, and would appreciate a quick review before I start (being a bit too hasty when updating to IOS 4.2.1 is what left me with a broken GPS in the first place)
SN: **938 (38th week of 2009)
Modem firmware: 06.15.00
I jailbroke this phone back in 2010 using jailbreakme.com, then unlocked using ultrasn0w (currently have 1.2.7 installed) on IOS 3.x. About a year ago, I updated to 4.2.1 (I think using redsn0w) with a custom .IPSW which worked, but updated the baseband as well hence breaking the GPS.
From what I've read, it seems like it's as simple as downloading redsn0w 0.9.14b2 and selecting only the downgrade baseband option. If that is successful but GPS doesn't work, then I should update to a custom 5.1.1 firmware (which I planned to do anyway).
Should this cause any issues with my phone, unlock, etc.? I realize it's hard to be definitive (ymmv) but appreciate any guidance.
08-21-2012, 10:14 AM #52
The Following User Says Thank You to EVO For This Useful Post:
08-23-2012, 07:00 AM #53
08-23-2012, 04:37 PM #54
09-08-2012, 06:10 AM #55
can someone give me the OK before I start as well?
Modem firmware: 5.16.05
my last JB was with using redsn0w_win_0.9.10b4
since i'm on 5.16.05, is it safe to upgrade to 6.15.05 first, upgrade to 5.1.1, and then downgrade to 5.13.04 in order to unlock with ultrasnow?
and if so, how do i upgrade to 6.15.05? details and specific version of tools would be greatly appreciated thank you!
09-08-2012, 01:59 PM #56
download the latest redsn0w v0.9.14b2 from the iphone-dev website, run the program as an administrator by right-clicking it and click "Run As Administrator"
then click on the Jailbreak button and follow the instructions to put your phone in DFU mode, then select ONLY the option to "Install the ipad baseband" and click Next, and follow the instructions to allow redsn0w to install the ipad baseband
once its done, run redsn0w again and follow the same procedure, except this time instead of selecting the "Install the ipad baseband", ONLY select the "Downgrade ipad baseband"
if you see the "Install Cydia" selected, unchecked that box since your phone is already jailbroken
09-10-2012, 05:26 PM #57
same problem here.... I restore my 3g to 4.2.1 baseband 6.15.0 but I cant unlock with ultrasn0w it keeep searching never find a carrier.
in adition I try to downdrade baseband from 6.15.0 to 5.13. ... with redsn0w all the process pass ok but the baseban do not change is still in 6.15.0
I want to star all over.. restore with factory 4.2.1 but the baseband do not change still the same....
I downgrade to 4.1 but the baseband still in 6.15.
what I need to do please some help