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

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:


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

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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.

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

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

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

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

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

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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.

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

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

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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

15 comments… add one
Hanson May 3, 2009, 8:03 am

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

Richard May 7, 2009, 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

Someth Mun May 16, 2009, 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!

iPhone Heat May 16, 2009, 7:32 pm

Sorry no solution for 5.8+ bootloaders for now..

M.G May 16, 2009, 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..

needbin May 22, 2009, 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

needbin May 22, 2009, 9:23 am

cydia is the application you will need to download from

NVT2 May 23, 2009, 8:54 pm

Thank you, my baseband is now 2.28.0

korab May 24, 2009, 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…

Anjum June 1, 2009, 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.

Manny June 4, 2009, 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

maybe June 25, 2009, 12:08 pm

this sucks my iphone is still at baseband 2.30

mR. kHaN June 23, 2011, 1:25 pm

I HAVE TRIED SOME MANY TIMES BUT,I AM NOT ABLE TO OPEN TERMINAL IN MY IPHONE’S SPRINGBOARD, THEREFORE I AM WAITING FROM IPHONEHEAT ADMIN TO ADVISE…..

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