Iphone 3G 3.1.2, baseband 2.3.03

**cactoos** · 10-26-2009, 04:34 PM

Hello everyone,

I purchased an iphone 3G a couple months ago, that was on firmware 2.2.1 with baseband 2.3.03, I unlocked it with a Gevey 3G sim adapter, but grew tired of the unstableness of it.

So I upgraded it with a 3.1.2 custom IPSW, the problem is now that the baseband is still at 2.3.03, so I have a lovely "No service" up on top. I was wondering if anyone could point me in the right direction of getting my baseband correct, so I can get t-mobile compatibility.

Thanks to anyone that helps

**reddawg** · 10-26-2009, 08:10 PM

Originally Posted by cactoos

Hello everyone,

I purchased an iphone 3G a couple months ago, that was on firmware 2.2.1 with baseband 2.3.03, I unlocked it with a Gevey 3G sim adapter, but grew tired of the unstableness of it.

So I upgraded it with a 3.1.2 custom IPSW, the problem is now that the baseband is still at 2.3.03, so I have a lovely "No service" up on top. I was wondering if anyone could point me in the right direction of getting my baseband correct, so I can get t-mobile compatibility.

You need to update your baseband to 04.26.08 in order to install Ultrasn0w and unlock your carrier so you can use T-Mobile with your iPhone 3G with firmware 3.1.2.

To upgrade your BB from 02.30.03 to 04.26.08, you will need to put your iPhone 3G into DFU mode, restore firmware 3.0 (BB 04.26.08), re-jaibreak using redsn0w and then restore your custom 3.1.2 firmware. Follow these instructions:

Download firmware 3.0 for the iPhone 3G. Here is the download link, http://appldnld.apple.com.edgesuite....1_Restore.ipsw
Put your iPhone 3G into DFU mode, not Recovery mode. This is required when restoring an older firmware.
- Connect your iPhone to your computer.
- Turn iPhone off.
- Hold the power and home buttons together for 10 seconds (exactly).
- Release the power but keep holding home until the computers beeps (observed on a PC) as a USB device is recognized.
- A few seconds later iTunes should detect your iPhone.
- You are in DFU mode, If the iPhone screen is OFF (black).
Open iTunes and press SHIFT+RESTORE (Windows) or OPTION+RESTORE (Mac) and then select your stock Apple 3.0 firmware called iPhone1,2_3.0_7A341_Restore.ipsw.
Let iTunes restore your iPhone 3G to firmware 3.0. When it done, you will see a USB cable point to Music CD on your iPhone. Close iTunes.
Now run Redsnow v0.8 and jailbreak your 3.0 firmware. There are guides on how to use "Redsn0w with firmware 3.0".

Now install your custom 3.1.2 firmware. Put your iPhone 3G into Recovery Mode, not DFU. Here how:

Put your iPhone 3G into Recovery Mode, not DFU mode.
- Turn the device completely off and disconnect it from cable/dock.
- Hold down the home button.
- While holding down the home button connect to a computer with a cable (easiest) or dock.
- Keep holding down the home button until you see a Connect-to-itunes screen (USB cable point towards a Music CD). You are now in recovery mode.
From here, open iTunes, press SHIFT+RESTORE (Windows) or OPTION+RESTORE (Mac) and then select your custom 3.1.2 firmware called something like iPhone1,2_3.1.2_7D11_Custom_Restore_W_ACTIVATION.i psw.

FYI: Make sure that your custom 3.1.2 firmware was generated by PwnageTool 3.1.4 using the following options:

Run Advance mode
Select "Activate Phone". This is needed for people who have T-Mobile or unofficial carriers.
Select Cydia, but not Icy.

Oh, don't forget to go into Cydia and install Ultrasn0w.

1. Open Cydia
2. Go into Manage -> Sources
3. Click Edit and then Add.
4. Enter Source: http://repo666.ultrasn0w.com
5. Click "Add Source".
6. Search for "Ultrasn0w" and install it. Make sure you turn off "Enable 3G" in Settings -> General -> Network, otherwise you will get no signal.

Other footnotes:

You will notice that the carrier name (T-Mobile) is missing next to the signal bars. It is a cosmetic issue and does not effect functionality. To fix it, install "MakeItMine" in Cydia and then enter T-Mobile when you run it.

**battlecrushr** · 10-26-2009, 08:21 PM

yep wat he said

**cactoos** · 10-27-2009, 01:23 PM

Thanks for the help, last night shortly after I posted I used Fuzzyband to upgrade my baseband only.

Thanks for the help again

**reddawg** · 10-27-2009, 11:44 PM

Originally Posted by cactoos

Thanks for the help, last night shortly after I posted I used Fuzzyband to upgrade my baseband only.

Thanks for the help again

Interesting, I thought Fuzzyband only downgraded the baseband.

**battlecrushr** · 10-28-2009, 03:41 PM

no it eithers upgrade the baseband to4.26 if ur baseband is less and it downgrades if its more that 4.26

**vwtoys** · 10-29-2009, 01:33 AM

Hi guys, sorry to hijack the thread. I have a similar problem though so I thought I might ask here.
I just received a 3G with 2.2.1, 2.30.03 baseband and 6.02 bootloader. I looked around and found that 2.30.03 cannot be downgraded to 2.28 since I have a 6.02 BL. My question is: Can I safely upgrade the Baseband from 2.30.03 to 4.26.08 using fuzzyband?
Once I do that do I grab a custom 3.0 ipsw file and, using itunes 8.2, upgrade the 2.2.1 firmware to 3.0?
Once the firmware is upgraded to 3.0, I will then use redsnow to Jailbreak? Then use ultrasnow from Cydia to unlock this phone??

Sorry I'm new at this.

**battlecrushr** · 10-29-2009, 03:46 PM

No u can't use fuzzyband. What u have to do is restore to 3.0 fimrware. Doesn't have to be a custom one. Just regular 3.0 the use redsn0w and then ultrasn0w

**doktorlet** · 10-29-2009, 06:18 PM

thank u very much for the info, im new in the iphone thing, very helpfull thanks again

**battlecrushr** · 10-29-2009, 07:11 PM

No problem

**vwtoys** · 10-30-2009, 01:56 AM

Originally Posted by battlecrushr

No u can't use fuzzyband. What u have to do is restore to 3.0 fimrware. Doesn't have to be a custom one. Just regular 3.0 the use redsn0w and then ultrasn0w

Cool, thanks! One more question though. I just installed itunes 8.2.1. (Is this version ok?) Since my 3g is still on 2.2.1 (2.30.03 baseband), do I plug the phone in and hit Shift-restore and grab the 3.0 ipsw file and just let it run(to update to 3.0 with 4.26.08 baseband)? Do I have to do any of that DFU/recovery mode mentioned earlier in this thread? Still a bit confused so I'm trying to understand the whole procedure before I update to 3.0 and then Jailbreak and unlock after. TIA

**battlecrushr** · 10-30-2009, 06:53 AM

I think it's all right. U don't need to do Dfu mode just shift restore

**nachobel** · 10-30-2009, 10:43 AM

If you're already jailbroken you don't need to DFU. If you're not then you do.

I typed this with two pinkeys while eating an apple, true story.

**jerry305** · 11-05-2009, 08:59 AM

Guys, I need some help. I have j/b 3gs with 3.0.1 bb 4.28 I want to upgrade to 3.1.2 and keep the 4.28 bb. How can I do this?

**battlecrushr** · 11-05-2009, 03:29 PM

Jerry u don't have to as blacksn0w is out. Just upgrade and jailbreK with blackra1n. Then ull be unlocked

**jerry305** · 11-05-2009, 04:07 PM

Ok, if I upgrade to a clean 3.1.2 and then follow Blackra1n & Blacksn0w how do I back up all my applications so I can restore them?

**battlecrushr** · 11-05-2009, 04:15 PM

Download aptbackup or pkgbackup from cydia. I seiouslt don't no how to use it so search in youube how to use it

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