Solution. how to downgrade iphone 4.0.1 and 4.0.0 to 3.x.x then you can unlock it

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gsm2start

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you will need those files


iTunes 9.1
3.1.3 OS or any other FW you desire
iRecovery and LibUSB


How to :

1. Donwload the 3.1.3 , iRecovery and Libusb . Install the LibUSB package

2. Connect your iPhone via USB, load iTunes and shift+restore with the original 3.1.3 firmware

3. During the restore process you will get an 1015 error. Don’t worry, that’s normal. Just click ok and close iTunes.



4. Open a command prompt "from start, run then type CMD then hit enter "
and cd "Change directory " into the "iRecovery_SVN" directory. you should remember where did you download it on your PC.




now run iRecovery.exe by typing iRecovery.exe -s and hit enter.
i phone should be connected in recovery mode

5. Now iRecovery should recognize your iPhone

6. now type those orders...

setenv auto-boot true ( hit enter )
saveenv ( hit enter )
fsboot ( hit enter )

7. Unplug your iPhone and turn it off by pressing the home+power button. Once it is off, turn it on by pressing the power button. Plug-in your iPhone and load iTunes to continue with the activation.


now youjailbreak you iphone by redsnow and unlock it with this way

iClarified - iPhone - How to Unlock the iPhone 3G, 3GS Using UltraSn0w

HAVE FUN


regards


br
mr_shehab
 
this is for 3g and 2g mehod before..

for 3gs not applicable..
need shsh back up on 3gs..

regards,
 
whats new??????

its work only 3g not 3gs

and in 3g no need to downgrade v4 to 3.1.3 for unlock jaibreak.

3g v 4 already tested and successfull jaibreak and unlock with redsn0w and ultrasn0w
 
DIDNT I SAY " I HAVE TESTED IT ON 3G ??

and i was talking about OS 4.0.1 Too
smarty
 
Its a nice solution but useless, not much important since iOS4.0 or higher is unlockable.
 
you still dont need to downgrade 3g from 4.0.1 to jailbreak use redsn0w and jailbreak as 4.0.....the only reason to downgrade 3g to 3.1.3 is only for 1 reason 4.0 and 4.0.1 makes 3g applications run slow
 
this is a false news, I really unlocked my iphone 3GS with this software, with one click I unlocked my iphone in 5 minutes.

source: Unlock iPhone 4 OS
 
you f-u-c-k-i-n-g liar this site is fake ,this guy should be banned from the forum

this is what you get when you go to download section

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iPhone 3GS
Instructions for PC
Firmware 4.0 Jailbreak / Unlock
THE FOLLOWING INSTRUCTIONS ARE FOR IPHONE 3GS ONLY. YOU MUST HAVE ITUNES 9.0
INSTALLED WHEN FOLLOWING THESE INSTRUCTIONS.
How to use these instructions.
Upgrading to 4.0 is a simple multi-step process. You must follow each step in
order.
If possible please Sync your iPhone with iTunes before starting these
instructions, as your data WILL be wiped off of the iPhone. You will get the
data and settings back if you have syncʼd your contacts, email, photos etc
before you start.
As you will be wiping the iPhone, any applications you downloaded onto the
iPhone will be removed but the Apple App store applications can be downloaded
for free again if you have downloaded them previously.
BEFORE YOU START
If when starting your computer you did not have to select a user and enter a
password do not continue with these instructions. For these instructions to work
your account must have Administrator permissions on your computer.
To find out how to set a password in XP please follow the instructions found at
this website: Windows Log On Password - Window XP Set Password - Change Windows Password
To find out how to set a password in Vista please follow the instructions found
at this website: Windows Vista Tips: Password-Protected File Sharing - WinPlanet Windows Software Reviews
Unlocking and upgrading iPhone 3GS to 4.0 (5 Steps)
Step 1.
Download the custom firmware file below. (remember where you save the file)
When the file have downloaded check its sizes match the following:
iPhone2,1_4.0_8A293_Restore_jailbreak.ipsw should be approximately 398 MB
*If the file above gets saved as a ".zip" file, DO NOT extract the folder. You
need to rename the ".zip" extension to ".ipsw", If you don't know how to do this
click here, or simply use Firefox Browser. Download Firefox browser here
If you seem to have problems downloading the file as it's quite large, try
clearing your internet cache before downloading or consider using a download
manager and the Firefox web browser.
FireFox Web Browser Firefox web browser | Faster, more secure, & customizable
Download Manager Download Download Accelerator Plus - Freeware Software - Tucows
Step 2.
Connect your iPhone to the computer using a cable not the Docking Device.
Step 3.
You will now see a screen with an iPhone called the
 
4.0.1 can be Jailbreak with RedSn0w 9.5 Beta 5.5
using FW 4.0 as IPSW file and Unlock with Ultrasn0w tested on 3g 101%
 
pleazze Mr jmec !
do you have this file "iPhone2,1_4.0_8A293_Restore_jailbreak.ipsw should be approximately 398 MB"
if you have it would you plz upload it and give us a link ?
 
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