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.
- Make sure your iPhone Bootloader version is 5.8.
- Make sure that your iPhone 3G is on Baseband 2.30
- You need MobileTerminal to proceed into this guide.
- Mobile Terminal (available under Terminal Support section in Cydia)
Launch Cydia from your iPhone Springboard.
then Go to Sections Tab at the bottom of the screen.
Go to iClarified from the list of Sections. If you’re unable to find it then you need to add following source to Cydia:
Learn how to add Source to Cydia.
From the list of packages, select DownBB.
then Press the Install button at the top right of the screen.
Press the Confirm button to begin installation.
On completion of the Installation, Press the big Return to Cydia button.
Press the Home button to return to SpringBoard and Launch the Terminal.
Input su into the terminal window.
When asked input alpine as password
Input DownBB into the terminal window to launch the Baseband downgrade script.
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.
DownBB script will be executed to downgrade iPhone Baseband.
When all done, your iPhone will Reboot automatically.
Please note you will now be on the 2.28 baseband.
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.
Many thanks to EvilPenguin|, pH, and DHowett for their work on this script! Thanks to Geo-hot for discovering the exploit!
Tried downloading DownBB but it doesn’t show up on my springboard…anyone else have this problem?
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
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!
Sorry no solution for 5.8+ bootloaders for now..
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..
you will have to download the terminal, from ceria… do a search and then you can follow the instructions … Mine just started to work
cydia is the application you will need to download from
Thank you, my baseband is now 2.28.0
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…
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.
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.
this sucks my iphone is still at baseband 2.30
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…..