Jailbreak and Unlock iPhone 2G 3.1.2 Using Blackra1n

Before you dive into the jailbreak process, please read through the note carefully:

• Make sure you use iTunes 9.0 or up for the jailbreak. If you are using older version of iTunes, please upgrade it first. You can download the latest version of iTunes from Apple.
• Before jailbreaking, make sure you have backup all your contacts, sms, photos, etc via iTunes. Simply sync your iPhone and backup
  the iPhone data.
• It work with iPhone 2G previously jailbroken with PwnageTool or Redsn0w.
• This guide is for iPhone 2G. For iPhone 3G/3GS jailbreaking, please refer to this post.
• Disclaimer: Jailbreaking may void your warranty of iPhone. Again, jailbreak it at your own risk.

Okay, that’s enough for the note. Let’s get started.

Upgrade your iPhone to OS 3.1.2

1. Download iPhone OS 3.1.2 firmware from here and save it into a folder.
2. Connect your iPhone via USB and launch iTunes.
3. Restore your iPhone with iPhone OS 3.1.2. For Windows, hold SHIFT key and click on the “Restore” button and select the firmware file (i.e. iPhone1,1_3.1.2_7D11_Restore.ipsw) you have just downloaded. For Mac, hold option key and click on the “Restore” button and select the firmware file (i.e. iPhone1,1_3.1.2_7D11_Restore.ipsw) to restore.
4. If you’re not using official sim, your iPhone will not be recognized by iTunes after restoration. Don’t worry. It’s normal. You can then close iTunes and continues with the next step.

Jailbreaking with blackra1n

1. Go to blackra1n.com and download blackra1n. Both Windows and Mac versions are available. So, you should download the correct version depending on your OS.
2. After downloading, unzip the blackra1n.zip.
3. 7. Make sure your iPhone is still connected with your computer via USB. Launch blackra1n.
4. Click “make it ra1n” to start the jailbreak.
5. Once you click the button, the jailbreak process starts and it’ll take around 30 seconds to complete.
6. Wait until you see the following message and your iPhone should be jailbroken after reboot.

Great! Up to this point, your iPhone should have been activated and jailbroken.

Installing Cydia

Tip: Before proceeding, if you have WiFi connection, I suggest you to first enable it before continuing. This should speed up the download process of cydia.

1. Next, you’ll have to install Cydia. Tap on the “blackra1n” icon.
2. Tap on “Cydia” and then “Install” button to install Cydia. Just wait until the download and installation to complete.

Unlocking iPhone 2G with bootneuter

Okay, with cydia installed, the whole jailbreak process is complete. But if you need to unlock your iPhone 2G to work with unofficial sim, launch cydia and install bootneuter. After installation, reboot your iPhone and enjoy iPhone OS 3.1.2!