eToolboxz member's area

iPhone 2G / 3G
Instructions for MAC / WIN
Firmware 4.0 Downgrade to 3.1.3

Think you’ve made a mistake by upgrading your iPhone or iPod touch to the latest and greatest iPhone OS beta? iPhone OS 4.0 can be a little buggy and may not even work nicely with some applications, but that didn’t stop some from making the leap. Apple intended for this beta version of the iPhone OS to be strictly for developers and it shows. We're going to show you how to return your device back to OS 3.1.3 far away from those beta bugs.

We suggest reading this how-to in its entirety before proceeding with this process. We successfully downgraded our device from 4.0 to 3.1.2 on multiple iPhone 3GS models, but haven’t tried this process on an iPhone 3G or iPod touch.

What You Need For MAC:
- An iPhone Running OS 4.0
- A Mac
- iRecovery v. 1.3 for Mac
- Libusb Library

What You Need For WIN:

- iRecovery and LibUSB

Step 1 - Download iRecovery and Libusb
You’ll need two pieces of software in order to downgrade your device from OS 4.0 back to OS 3.1.3. You can download iRecovery from above. You can download Libusb from above.

You can install Libusb by unzipping and running the installer. Unzip and place the iRecovery script on your Desktop.

Step 2 - Sync Your iPhone
The first part of any OS restore should be to backup and sync your iPhone data. Connect your device to iTunes and click the lovely Sync button. Depending on how many changes you have, this could take a while so get a snack and watch the status bar climb to the finish line.

iPhone OS 4.0 doesn’t allow you to backup your device, so anything that’s not synced over to iTunes will be lost.

Step 3 - Start The Restore

Connect your iPhone to your computer.
Turn iPhone off.
Start iTunes.
Hold Power and Home buttons together for 10 seconds or so.
Release Power button but keep holding the Home button until your computer recognizes a new USB device.
iTunes will now recognize your iPhone.

Press alt/option and click the Restore button in iTunes. This will bring up a dialog that will allow you to manually select your iPhone OS firmware. Navigate to User/Library/iTunes/iPhone Software Updates/ and select “iPhone2,1_3.1.3_7E18_Restore.ipsw”. Click Choose and the OS restore process will begin.

If you don’t have this version of the iPhone OS software, then you’ll need to download it by clicking your version below. Then repeat this process by navigating to the download location and selecting it. Click Choose and the OS restore process will begin.

Download iPhone OS 3.1.3 for iPhone 3G

Download iPhone OS 3.1.3 for iPhone 3GS

Your device will most likely show the error "1015" when it is restoring the firmware. Ignore this error as we will take care of it in the next step.

Step 4 FOR MAC - Use iRecovery to complete restore
Now we’re going to use iRecovery to complete the restore process and get around the firmware upgrade problem that we encountered in the previous step.

copy and unzip irecovery to your desktop

To do this, launch Terminal (Applications/Utilities) and type in the following commands:

cd Desktop

./iRecovery -s

setenv auto-boot true

saveenv

fsboot

exit

After a few seconds, you can disconnect your iPhone and power it off manually by pressing the power and home buttons simultaneously. Now when you power up your iPhone, you should see the standard connect to iTunes image.

You can now safely connect your iPhone to iTunes.

Step 4 - FOR WIN Use iRecovery to complete restore
Now we’re going to use iRecovery to complete the restore process and get around the firmware upgrade problem that we encountered in the previous step.

copy and unextract irecovery to your desktop

Install “libusb-win32-filter-bin-0.1.12.1.exe” and keep the file on the desktop.

Launch Command Prompt (start menu / programs / accessories / ) and type in the following commands:

cd Desktop

./iRecovery -s

setenv auto-boot true

saveenv

fsboot

exit

After a few seconds, you can disconnect your iPhone and power it off manually by pressing the power and home buttons simultaneously. Now when you power up your iPhone, you should see the standard connect to iTunes image.

You can now safely connect your iPhone to iTunes.

[Update]: Windows 7 or Windows Vista users, who can not run the libusb and only getting malfunction of all USB ports), a fix is available through which you can bring the iPhone in Recovery Mode. Just follow the steps below:

Download the file and extract it. There are 3 folders (ADD HARDWARE WIZARD, INSTALL LIBUSB, BATCH) and a file called libusb FIX.exe.
Enter in the first folder and attached your iPhone to the computer and then open infwizard and then click Next.
Here choose the list “Apple Mobile Device USB Driver”, click “next” again “next” and then save the file as MYSETUP.inf in folder 1.
Open Start menu and type “hdwwiz.cpl” and press Enter
Click Next to continue.
Select Install Manually (Advanced)
Make sure “Show all Devices” is selected and click next.
Click Have Disk….
Click Browse… and find “MYSETUP.INF” you saved earlier in folder 1. Go ahead and install the driver.
Press “OK” and then “Next” Twice
If warning appears, click “Install Anyway.”
Go to the folder 2), right-click on Setup.exe libusb 32win and go to Properties: Here, change the compatibility with “Windows XP Service Pack 2″ and put “Run as administrator”, then install it.
We’re almost there! Now, let’s start libusb FIX.exe (as administrator) and click first on “install batch” then click “install watermark fix”, here select “English” and then “Add to tcpip.sys.