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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.

04-15-2009, 17:46	#1 (permalink)
esprilarge2002 Insane Poster Join Date: Jun 2004 Location: TUNISIA Age: 48 Posts: 66 Member: 70893 Status: Offline Thanks Meter: 5	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.