iPlus 2.0b Features
1-Unlock and if required automatically downgrade the bootloader to 3.9FakeBlank
5-Add the following packages: Installer, Community Services, BSD subsystem, OpenSSH, VT-100
Plus: BSD Fix, VT100 Fix, Summerboard themes directory fix, Relocates Fonts and Ringtones (More than 120MB free)
Before attempting this make sure you have restored your iPhone to 1.1.4 using iTunes and have your iPhone connected to the computer via USB. You can follow this procedure with any SIM card in your iPhone.
Download iPlus 2.0b from here
From the file we just downloaded extract the iPlus2.0 folder to your Desktop.
Press the Windows Key + R on your keyboard to bring up the Run window. Input cmd into the entryfield and then click the Ok button.
The Command Prompt window will open. Enter the following command then press Enter
(remove the space between iPlus and 2.0)
Enter the following command into the Command Prompt to unlock and downgrade your bootloader.
NOTE**: This command will automatically activate, jailbreak, and unlock. If necessary and able it will also change your bootloader to the 3.9-fakeblank Bootloader. If you don't want to unlock just drop the -u and iPlus will only activate and jailbreak!
The program will then put your iPhone into recovery mode. Once it is successfully in recovery mode you will be asked to wait 2 minutes and 30 seconds.
Once rebooted it will tell you that Jailbreak and setup for next pass completed. Now it will proceed to unlock, downgrade and activate.
Once your iPhone comes out of its final reboot it will be activated, jailbroken, unlocked and bootloader downgraded !!!
THANKS***: A big thanks go to aviegas for creating iPlus !!!