downgrade Baseband 20.30.03 to 02.28.00

[esprilarge2002]

As many know, it is currently impossible to désimlocker firmware with a Baseband 02.30.03. It is therefore mandatory in this case to downgrade the baseband. Until today, it was impossible to downgrade the Baseband charligoto but we shared some news GeoHot succeeded to make a downgrade of the Baseband 20.30.03 to 02.28.00.

So I simplified his method by creating scripts that I have gathered a few lines of code

Namely:
It is only possible to downgrade the Baseband to Bootloader 5.8. It is actually impossible if the Bootloader is version 5.9 or 6.2. (Thanks for the info Ouioui)

Preamble:
1) Open Cydia and install "MobileTerminal" and "Wget" if not already done so.
2) Quit Cydia

Preparations of necessary files:
1) Launch Terminal
2) Type "su" then return (without quotes)
3) Type in "alpine" back then (nothing will appear, this is normal, without the quotes)
4) Type "wget http://*******/tEHJc" then return (without quotes)
5) Type "sh BBdownload" then return (without quotes). Wait until the end of downloads.

Checking the version of Baseband:
1) Type "sh BBversion" then look for the "Boot Loader Version" If your bootloader is 5.8, continue the tutorial. If your bootloader is 5.9 or 6.2, expect a new version of the downgrade. That one is not currently compatible.

Downgrade the Baseband:
1) Type "sh BBexec" then return (without quotes). Wait until the installation script. Your iPhone will restart.

Go to Settings -> Information -> Baseband: The version is 02.28.00
Bravo, you can make a désimlock with Yellowsn0w if you want
If your Baseband is still 02.30.03, made following the tutorial.

1) Open Terminal
2) Type "rm / var / mobile / BB *" without quotes and press return
3) Type "rm / var / root / BB *" without quotes and press return
4) Type "rm / var / root / IC *" without quotes and press return
5) Repeat the tutorial now.

[lotfi17]

I really wonder how many iphones "baseband 2.30 with Bootloader version 05.08? I never seen one, just 05.09 . Some people had Bootloader version 6 but never seen that either. Anyway I believe most people got Bootloader version 05.09 even with Os 3.0 and baseband 4.20.01 the loader version is 05.09 like mine. This new solution for downgrade is not the real work. Wish u luck.

[SLIPLOCK]

phone with 2.2.1/2.30.03 and BL 5.08 are phone upgraded by mistake with itunes.
i think < 2.1 are in 5.08
anyway i have no proof, but some of new phone i get 2.2.1 ootb are in 5.09 or 6.02
wbr

[sid432]

Yeah man I tested this solution. I had 2.2.1 with the boot loader 5.08. I did the above steps and my modem firmware is changed to 2.28. thank you very much

[elmersattic]

What a star you are. Successfully downgraded baseband from 02.30.03 to 2.28.00 & unlocked with yellowsn0w. Lucky for me I also had boot loader 5.08. Tried Vodafone sim 100% unlock

[MYUNLOCKING]

plese post some video tutorial link..

[munir0410]

Originally Posted by mobileclinic_14

plese post some video tutorial link..

chek here

http://www.iclarified.com/entry/index.php?enid=3583

[elmersattic]

is there going to be a solution for 5.09 & higher? Have tried on 6.02 & can't find ANY network. Have to restore using itunes to get original network

[nishaon]

Originally Posted by elmersattic

is there going to be a solution for 5.09 & higher? Have tried on 6.02 & can't find ANY network. Have to restore using itunes to get original network

You have nothing to do at the moment except waiting.

[likwidsky]

i had Boot Loader Version: ICE2_BOOT_05.08_G2M3S2 and i tried earlier in modem 4.20.01 but i failed...



rgds..

[likwidsky]

i had Boot Loader Version: ICE2_BOOT_05.08_G2M3S2 and i tried earlier in modem 4.20.01 but i failed...



rgds..

[zino]

Originally Posted by lotfi17

I really wonder how many iphones "baseband 2.30 with Bootloader version 05.08? I never seen one, just 05.09 . Some people had Bootloader version 6 but never seen that either. Anyway I believe most people got Bootloader version 05.09 even with Os 3.0 and baseband 4.20.01 the loader version is 05.09 like mine. This new solution for downgrade is not the real work. Wish u luck.

I too have never seen one,

[likwidsky]

i tried this procedure in my iphone with bootloader 5.08 and a modem FW 4.20.01 but i failed again...

i got error onGetting EBL Version................Timed out

it loops over and over for about 9 times i think..

[SLIPLOCK]

of course.
for 4.20.01 you need patched ICE2_2.28.00.fls with 4.20.01 certificates.
if you have this file you can downgrade.
wbr

[Brka]

http://forum.gsmhosting.com/vbb/show...4&postcount=26