How to Downgrade iPhone 3G (2.2.1) Baseband 2.30 to 2.28 for Unlock | Step-by-Step Guide

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In this iPhone Guide, you will learn how to downgrade Baseband 2.30 to 2.28 for your iPhone 3Gs having Bootloader 5.8. After downgrading the Baseband you will be able to Unlock iPhone 3G with YellowSn0w. Gurus are working on a similar exploit for higher Bootloader versions.

Prerequisites:

Make sure your iPhone Bootloader version is 5.8.
- Learn how to check iPhone Bootloader version (Windows)
- Learn how to check iPhone Bootloader version (Mac)
Make sure that your iPhone 3G is on Baseband 2.30
- Learn how to check iPhone Baseband version
You need MobileTerminal to proceed into this guide.
- Mobile Terminal (available under Terminal Support section in Cydia)

Step 1
Launch Cydia from your iPhone Springboard.
then Go to Sections Tab at the bottom of the screen.

Step 2

Go to iClarified from the list of Sections. If you’re unable to find it then you need to add following source to Cydia:

http://cydia.iClarified.com

Learn how to add Source to Cydia.

Step 3
From the list of packages, select DownBB.
then Press the Install button at the top right of the screen.

Step 4
Press the Confirm button to begin installation.
On completion of the Installation, Press the big Return to Cydia button.

Step 5
Press the Home button to return to SpringBoard and Launch the Terminal.

Step 6
Input su into the terminal window.
When asked input alpine as password

Step 7
Input DownBB into the terminal window to launch the Baseband downgrade script.

Step 8
Now you will be asked to confirm you would like to continue. If you’re sure that you’re on Bootloader 5.8 and Baseband 2.28 input Yes into the window.

Step 9
DownBB script will be executed to downgrade iPhone Baseband.
When all done, your iPhone will Reboot automatically.

Step 10
Please note you will now be on the 2.28 baseband.

downgrade-bootloader-230-to-228-for-iphone-17

As you have downgraded iPhone 3G baseband 2.30 to 2.28 now you can unlock your iPhone 3G.

Learn How to Unlock iPhone 3G with YellowSn0w.

THANKS
Many thanks to EvilPenguin|, pH, and DHowett for their work on this script! Thanks to Geo-hot for discovering the exploit!

via iClarified

Posted in: iPhone Guides, iPhone Tutorials, iPhone Hacks on April 22, 2009

Tags: Bootloader, iPhone, iPhone Baseband, iPhone Guides, iPhone Hacks, Step-by-Step

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Comments:

Hanson 3 May 2009 at 8:03 am #

Tried downloading DownBB but it doesn’t show up on my springboard…anyone else have this problem?

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Richard 7 May 2009 at 9:22 am #

I downloaded the DownBB as instructed but after when it was done downloaded no icon appear or anything nothing happen i think i did something wrong let me know what i did wrong

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Downgrade iPhone 3G baseband (any) to 2.28 with 3G Fuzzyband Downgrader | iPhone Hacks | iPhone Heat

[...] few weeks back, we wrote a step-by-step iPhone guide on How to Downgrade iPhone 3G (2.2.1) Baseband 2.30 to 2.28 for Unlock. That guide let you downgrade iPhone 3G baseband 2.30 to 2.28. But there are two limitation to that [...]

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Someth Mun 16 May 2009 at 3:39 pm #

unfortunately, I have a baseband 2.30 but my bootloader is 6.02. so how can I downgrade my bootloader to 5.8? or any advice pls. Now my iPhone 3G 16G is having a problem of “no service” after upgrading from 2.2 to 2.2.1 and jailbreak. Pls help!

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iPhone Heat 16 May 2009 at 7:32 pm #

Sorry no solution for 5.8+ bootloaders for now..

Reply
M.G 16 May 2009 at 9:37 pm #

IS there any solution for the Iphones with 2.30.03 modem versions, i m having a seriuos problem of ” no serivce ” in my iphone, can anyone plz help me out..

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needbin 22 May 2009 at 9:22 am #

you will have to download the terminal, from ceria… do a search and then you can follow the instructions … Mine just started to work

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needbin 22 May 2009 at 9:23 am #

cydia is the application you will need to download from

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NVT2 23 May 2009 at 8:54 pm #

Thank you, my baseband is now 2.28.0

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korab 24 May 2009 at 8:59 pm #

hello i have downgrade from 2.30 to 2.28 and i had in begining network than it start saying no service no service..i had also 2.2.1 and change to 2.2 but i dont have no network…

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Anjum 1 June 2009 at 9:40 am #

hi,

i upgraded my iphone 3g to 2.2.1 and i believe my base band has been upgraed and it is totally locked in this condition how do i access cydia to downgrade my 3g phone( using wifi ?) PLEASE advice thanks.

Reply
Manny 4 June 2009 at 6:48 pm #

Hi Guys

I have tried almost everything about downgrading my baseband to 5.8 and nothing seems to work.
I also have a 3g 16mb with baseband 5.9 and software 2.2.1 my guess is we will have to wait untill QuickPWN come up with a package that will work.

Manny

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How to Downgrade iPhone 3G (2.2.1) Baseband 2.30 to 2.28 for … « Get iPhone 3GS

[...] iPhone Heat wrote an interesting post today onHow to Downgrade <b>iPhone 3G</b> (2.2.1) Baseband 2.30 to 2.28 for <b>…</b>Here’s a quick excerpt [...]

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maybe 25 June 2009 at 12:08 pm #

this sucks my iphone is still at baseband 2.30

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