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Download iREB RC4 for Windows.

How to fix iTunes error 1603 :

Below I will show you some tips that help you to fix iTunes error 1603 :

Tip 1: Check for iTunes updates :

• Windows: Choose Help > Check for Updates.
• Mac: Choose iTunes > Check for Updates.

Tip 2: Restart your Computer

• Restart your computer may help to fix iTunes error 1603

Tip 3: Try different USP Port

• Try to connect your iPhone with computer via another USB port, then try to restore using iTunes.

Tip 4: Restart Apple Mobile Device Service (Windows Only) :

Restoring Apple mobile device service on Windows XP or Windows Vista / 7 may help you to fix iTunes error 1603 while restoring your iPhone.

Windows XP

1. Close iTunes and disconnect iPhone.
2. Choose Start > Control Panel.
3. Inside the Control Panel, open Administrative Tools.
4. Open Services.
5. Select Apple Mobile Device and click Stop the service as shown below:
   
6. After the service is stopped, click Start the service.
7. After the Apple Mobile Device service has started again, open iTunes and connect iPhone.
8. Select iPhone in the Source list, click the Summary tab, and then click Restore.

Windows Vista

1. Close iTunes and disconnect iPhone.
2. Click the Windows Start button
3. In the Start Search field type "Services."
4. In the Programs section of the search results, Click "Services".
5. Select Apple Mobile Device and click Stop the service as shown below:
   
6. After the service is stopped, click Start the service.
7. After the Apple Mobile Device service has started again, open iTunes and connect iPhone.
8. Select iPhone in the Source list, click the Summary tab, and then click Restore.

Tip 5: Reset the iPhone sync history and restore on Windows and Mac - How to do this ?

Windows

1. Open iTunes
2. On the Edit menu, click Preferences.
3. Click the iPhone tab.
4. Click the Reset Sync History button.

Mac

1. Open iSync.
2. Choose iSync > Preferences.
3. Click the Reset Sync History button.

Tip 6: Create a new user account - How to do this ?

Windows Vista and Windows XP

1. From the Start menu, choose Control Panel.
2. Open User Accounts.
3. Select Create a new account and follow the instructions to complete the account setup process.
4. Once the new account is created, choose Log Off from the Start menu.
5. Log in to the newly created user account.

Mac OS X

1. Choose Apple menu > System Preferences.
2. Choose View > Accounts.
3. Click the "+" (you may need to authenticate to be able to click this).
4. Give the new user a name and short name and enter a password.
5. Select the checkbox for "Allow user to administer this computer". This makes the user an administrator user.
6. Click Create Account.

If you the above tips didnt work with you and fixed iTunes error 1603 you have to download iReb - Click Here - as it will help you to bypass iTunes error 1603.