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i need to upgrade my IOS from 4.1 to 4.3 or higher on my Iphone 3gs, firmware 6.15 new bootroom. I had unlocked and jailbroke when i bought it 1.5 yrs back. Most of my apps started crashing and my Iphone is increasingly becoming difficult to use. I need some help very badly?? i had not jailbroke myself before. Thanks in advance.... Model: MC131ZA Serial number: xx941xxxxxx

asked 13 Jan '13, 14:08

sherear's gravatar image


What SHSH do you have. See this at the top of cydia.

(13 Jan '13, 14:13) iAdam1n ♦ iAdam1n's gravatar image

SHSH: iOS 4.1 , 4.3.3, 4.3.5, 5.0.1, 6.0.1

(14 Jan '13, 00:13) sherear sherear's gravatar image

It weird that you have iPad baseband and had it unlocked when your phone is factory unlocked, Model ZA suffix means it's from Singapore, all iPhones in SG are FU. You are in luck that you have an old bootrom unit, it means you will be untethered JB on any firmware.

Download 6.0 ipsw and 6.0.1 ipsw and redsn0w 9.15b3. Restore to 6.0.1 using redsn0w/extras/even more/restore/browse for 6.0.1. Select prevent baseband update when prompted. Do redsn0w/extras/select ipsw/browse for downloaded 6.0 ipsw then jailbreak using redsn0w/jailbreak/tick install cydia. Once done, do select ipsw again and go to redsn0w/jailbreak/tick downgrade baseband. It should fix your gps and no you do not need to install ultrasn0w unlock.


answered 14 Jan '13, 01:34

justinred's gravatar image

justinred ♦

hi.. Thanks for your reply... My unit has new bootroom.... I checked it using idetector...... Does the above procedure apply for new bootroom unit also??

(14 Jan '13, 01:42) sherear sherear's gravatar image

Are you certain it is new? Lower than 42 for 4th and 5th with 9 for 3rd digit of serial are always old. Check again. To identify if your 3Gs is old or new bootrom. Using latest redsn0w, go to extras/even more/identify. Place device in DFU mode. Check bootrom, if 359.3 = old, if 359.3.2+ = new. Press power+home, release both on apple to kick out of DFU mode. Let me know if it is 359.3 or 359.3.2+.

(14 Jan '13, 02:32) justinred ♦ justinred's gravatar image

I am certain that my iphone has new bootrom... Two confirmation... 1. Placed my device on DFU mode and checked using idetector. 2. From web, i came to know that all MC series have new bootrom. Correct me if i am wrong. However i was not able to perform the check that u specified above. After placing my device on DFU mode if i click identify nothing is showing up.

(14 Jan '13, 05:21) sherear sherear's gravatar image

Not all MC models are new bootrom.

(14 Jan '13, 05:31) justinred ♦ justinred's gravatar image

If you are sure that it is new, it is tethered jb on 6.0.1. You can restore using redsn0w to 5.0.1 for an untethered JB.

(14 Jan '13, 05:33) justinred ♦ justinred's gravatar image

So what should i now?? i am confused my friend. Could you please explain in little more detailed?? I also checked your method to find if old or new bootrom. It is new bootrom. It showed 359.3.2

(14 Jan '13, 05:55) sherear sherear's gravatar image

Download 5.0.1 ipsw. Go to redsn0w/extras/even more/restore, browse for the 5.0.1 ipsw, choose remote, let it restore choose prevent baseband update on prompt. After restore, do redsn0w/jailbreak/install cydia. Once done do redsn0w/jailbreak/downgrade baseband. Done.

(14 Jan '13, 06:32) justinred ♦ justinred's gravatar image

Ok.. got it... thanks... will try that and get back...

(14 Jan '13, 06:41) sherear sherear's gravatar image

@justinred the cutoff is week 40, not 42, although 41 could very well be old bootrom since it's so close, and week 39 could be new.

(14 Jan '13, 22:43) spockers ♦♦ spockers's gravatar image

@justinred: I am trying to restore.. but it is just not happening... It says "restore couldnot complete because iphone is in DFU mode." But redsn0w promted me to put in DFU mode which i did... So what do i do??

(15 Jan '13, 04:18) sherear sherear's gravatar image

Finally things are working... Thanks a lot @justinred... Restarted my iphone (pressing home+power button) to solve the DFU mode problem.... Didnt have any roadblocks after that...

Let me summarize what i did.

  1. Download 5.0.1 ipsw
  2. Download redsn0w 9.15b3
  3. Place above 2 files in a separate folder.
  4. Go to redsn0w/extras/even more/restore, browse for the 5.0.1 ipsw, choose remote, let it restore choose prevent baseband update on prompt. After restore, do redsn0w/jailbreak/install cydia. Once done do redsn0w/jailbreak/downgrade baseband

Problems faced:

  1. Redsn0w said restore couldnot complete because iphone is in DFU mode. Let me tell u wat i did: Restarted my iphone by pressing power + home button) then copied SQLite3.dll file from C:Program Files (x86)Common FilesAppleApple Application Support (Windows 7 64 bit) to the folder where redsn0w and 5.0.1 ipsw were present.

2.While downgrading baseband iphone got stuck in apple logo while rebooting after downgraded. It never rebooted. So i waited for 1 hour and then lost patience and manually rebooted again. It worked....!!!!

(15 Jan '13, 12:51) sherear sherear's gravatar image

Hi...iphone is very new for me.... so could you people explain me how to upgrade it from 4.1 to 4.3. i have opened the cydia,on top of it shows SHSH: iOS 4.1 4.2.1.r.1, 4.3, 4.3~b1/b2/b3. kindly let me know how to proceed now to do the upgrade.

i have iphone 3GS,iOS 4.1,Cydia 1.1.6


answered 03 Apr '13, 14:53

Sunny11's gravatar image


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Asked: 13 Jan '13, 14:08

Seen: 12,049 times

Last updated: 03 Apr '13, 14:53

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