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How to fix some mysterious problems.

Hello everyone, I have an Iphone 3gs on stock 5.1 (06.15.00) with new bootrom and the 3,4,5 digit of the serial number is 135. The problem is that I orginally jailbroke with snowbreeze and then unlocked with ultrasnow but the phone would not recognize the sim card. After about 30 minuts the phone got stuck on apple logo so I had to restore. Because the Iphone would not recognize my chip I decided to re-jailbreak and unlock using the redsnow 10b6 method. Redsnow created a custom ipsw without baseband update. I restored and the Iphone was jailbroken with no problems at all. Then I applied ultrasnow fixer then ultrasnow. The Iphone just says "Searching..." then "No Service".

My question is I have read blogs about the Iphone 3gs 5.1 (06.15.00) new bootrom having problems with jailbreaks that it is possible to permanently break the cellular radio for serial numbers 135 or higher. I am in fear this is what I did. Does anyone know if this is what happened? How can I check if the cellular radio is broken? If I didnt break it does anyone know how to make this model of Iphone recognize my SIM? Can I reflash this Iphones baseband?


asked 29 Mar '12, 10:27

rllopez8200's gravatar image


This is a prime example of the "ultrasn0w fixer causes more problems", and its cause you are on 5.1

Pick another ios version to downgrade to that you have SHSH for and it will work


answered 29 Mar '12, 12:24

theiphoneguy's gravatar image

theiphoneguy ♦

Hi, thank you for the response. Can I downgrade? This Iphone 3gs has stock 5.1 (06.15.00). I thought I can not downgrade with stock 5.1. I await your reply...

(29 Mar '12, 14:03) rllopez8200 rllopez8200's gravatar image

stock 5.1 does NOT have 6.15 in it, thats the ipad baseband. You will need tiny umbrella on the computer to check shsh or open cydia on the phone and it will list shsh up top like "SHSH: 4.1, 4.2.1, 5.0.1, 5.1"

P.S. if you used a stock 5.1, you need to reflash the ipad baseband

(29 Mar '12, 14:08) theiphoneguy ♦ theiphoneguy's gravatar image

I bought this Iphone brand new from ebay and to my knowledge he didnt do anything to this phone. There is a way to bypass the activation screen for 30 senconds (which I did). The Phone came stock with 5.1 (06.15.00) and the 3,4,5 digit of the serial is 135. Is it safe to reflash the baseband on this Iphone? Doesnt that break the celular radio?

(30 Mar '12, 14:03) rllopez8200 rllopez8200's gravatar image

if its on 6.15 its not gonna break it putting 6.15 on again.......

(30 Mar '12, 14:07) theiphoneguy ♦ theiphoneguy's gravatar image

I checked the SHSH on cydia and it says: ios 4.1. So what does that mean I should do exactly? Restore to 4.1? Then flash baseband?

(01 Apr '12, 19:26) rllopez8200 rllopez8200's gravatar image

pretty much, restore to 4.1, then use latest redsn0w to jailbreak + reflash BB

(01 Apr '12, 22:24) 1L1keTurtles 1L1keTurtles's gravatar image

On another blog I found this thread. This is in response for someone that had a 3GS 5.1 and wanted to downgrade to 4.1

My Iphone is a 3GS 5.1 (06.15.00) with new boot rom and serial number 135. According to this thread below. Its not a good idea to reflash its baseband. What are your thoughts?

gasto4003-25-2012, 22:30 I think there's no need to download a custom firmware. Firmware 4.1 is still being signed by Apple

sparker103-26-2012, 00:29 Does this work for 3GS iphones manufactured after week 35, 2011? new base band 5.16.05?

celumaster.03-26-2012, 00:52 If you flash the baseband for this phone surely will damage the device.

avoid this method...

sparker103-26-2012, 02:27 Thanks. That's what I thought but I'm clutching at any hope I can unlock this b##tard.

tuban_gsm03-26-2012, 04:44 I think there's no need to download a custom firmware. Firmware 4.1 is still being signed by Apple yes you are need download custom firm for downgrade to 4.1

(02 Apr '12, 09:52) rllopez8200 rllopez8200's gravatar image

I found this method below for unlock downgrade iphone 3gs 5.1 to 4.1. Has anyone tried this with an Iphone 3GS 5.1 (06.15.00) new bootrom and serial number 135? Please post if you were succesful. Im in fear to try it because I dont want to break the celular radio. Thanks alot!

unlock downgrade iphone 3GS 5.1 to 4.1

Download Ireb4 - ( (

Download iOS 4.1 custom firmware By dampealdany - part 1: iPhone2_1_4.1_8B117_Custom_Restore.ipsw.001 ( - part 2: iPhone2_1_4.1_8B117_Custom_Restore.ipsw.002 (

join the files with HJSPLIT: hjsplit.exe (

open the program, and select join, you need the two files in the same folder, and select the part 1 file and in the same folder appear the new file join

Download redsn0w - redsn0w_win_0.9.6rc12.rar ( I recomend that you have installed iTunes 10.4

How to downgrade 5.1 to 4.1 iPhone 3GS :

Step 1: Run Ireb4 , your iPhone 3GS will enter dfu mode. Step 2: Go to iTunes and flash with 4.1 custom firmware ipsw. Step 3: Jailbreak your iPhone 3GS with Redsn0w (you need the original firmware 4.1 to do the jailbreak with this redsn0w), patch the iphone with the ipad baseband 6.15. Step 4: Unlock your iPhone 3GS with ultrasn0w

if you don´t get signal, patch again the baseband 6.15

that is all, i do it and works 100% :D:D:D

(02 Apr '12, 10:00) rllopez8200 rllopez8200's gravatar image
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Asked: 29 Mar '12, 10:27

Seen: 4,705 times

Last updated: 02 Apr '12, 10:00

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