downgrade Baseband 20.30.03 to 02.28.00 - GSM-Forum

esprilarge2002 · 04-15-2009, 17:46

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 · 04-15-2009, 18:04

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 · 04-15-2009, 18:32

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 · 04-16-2009, 15:45

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 · 04-16-2009, 23:49

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 · 04-17-2009, 00:04

plese post some video tutorial link..

munir0410 · 04-17-2009, 00:51

Quote:

Originally Posted by mobileclinic_14

plese post some video tutorial link..

chek here

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

elmersattic · 04-20-2009, 00:54

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 · 04-20-2009, 08:03

Quote:

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 · 04-20-2009, 09:37

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

rgds..

likwidsky · 04-20-2009, 09:38

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

rgds..

zino · 04-20-2009, 10:59

Quote:

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 · 04-21-2009, 09:13

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 · 04-21-2009, 18:31

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 · 04-21-2009, 20:36

How to Downgrade Your iPhone 3G 2.30 (2.2.1) Baseband for Unlock Tutorial Here !!!

04-15-2009, 17:46	#1 (permalink)
esprilarge2002 Insane Poster Join Date: Jun 2004 Location: TUNISIA Age: 37 Posts: 67 Member: 70893 Status: Offline Thanks: 33 Thanked 6 Times in 4 Posts	downgrade Baseband 20.30.03 to 02.28.00 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.

04-15-2009, 18:04	#2 (permalink)
lotfi17 Freak Poster Join Date: Nov 2000 Location: Oslo Posts: 127 Member: 2616 Status: Offline Thanks: 0 Thanked 6 Times in 5 Posts	Bootloader version 05.08 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.

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04-15-2009, 18:32	#3 (permalink)
SLIPLOCK No Life Poster Join Date: Oct 2004 Location: Galaxy Age: 35 Posts: 1,265 Member: 86301 Status: Offline Thanks: 93 Thanked 105 Times in 68 Posts	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

04-16-2009, 15:45	#4 (permalink)
sid432 Junior Member Join Date: Feb 2009 Posts: 38 Member: 968873 Status: Offline Thanks: 4 Thanked 12 Times in 5 Posts	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

04-16-2009, 23:49	#5 (permalink)
elmersattic Major Poster Join Date: Apr 2005 Age: 49 Posts: 41 Member: 140808 Status: Offline Thanks: 0 Thanked 2 Times in 2 Posts	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

04-17-2009, 00:04	#6 (permalink)
MYUNLOCKING No Life Poster Join Date: Apr 2008 Location: karachi .. Age: 27 Posts: 3,047 Member: 749969 Status: Offline Sonork: 100.1581886 Thanks: 341 Thanked 765 Times in 433 Posts	plese post some video tutorial link..

04-20-2009, 00:54	#8 (permalink)
elmersattic Major Poster Join Date: Apr 2005 Age: 49 Posts: 41 Member: 140808 Status: Offline Thanks: 0 Thanked 2 Times in 2 Posts	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

04-20-2009, 09:37	#10 (permalink)
likwidsky Freak Poster Join Date: Dec 2004 Posts: 190 Member: 97346 Status: Offline Thanks: 1 Thanked 13 Times in 9 Posts	i had Boot Loader Version: ICE2_BOOT_05.08_G2M3S2 and i tried earlier in modem 4.20.01 but i failed... rgds..

04-20-2009, 09:38	#11 (permalink)
likwidsky Freak Poster Join Date: Dec 2004 Posts: 190 Member: 97346 Status: Offline Thanks: 1 Thanked 13 Times in 9 Posts	i had Boot Loader Version: ICE2_BOOT_05.08_G2M3S2 and i tried earlier in modem 4.20.01 but i failed... rgds..

04-21-2009, 09:13	#13 (permalink)
likwidsky Freak Poster Join Date: Dec 2004 Posts: 190 Member: 97346 Status: Offline Thanks: 1 Thanked 13 Times in 9 Posts	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..

04-21-2009, 18:31	#14 (permalink)
SLIPLOCK No Life Poster Join Date: Oct 2004 Location: Galaxy Age: 35 Posts: 1,265 Member: 86301 Status: Offline Thanks: 93 Thanked 105 Times in 68 Posts	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

04-21-2009, 20:36	#15 (permalink)
Brka No Life Poster Join Date: Jun 1999 Location: Serbia Age: 37 Posts: 2,163 Member: 163 Status: Offline Thanks: 523 Thanked 821 Times in 317 Posts	How to Downgrade Your iPhone 3G 2.30 (2.2.1) Baseband for Unlock Tutorial Here !!!