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Here is a quick tutorial since so many people ask this question, I will try to keep it up to date on the latest firmwares.

What’s a Baseband?

The ‘baseband’ is the generic nickname given to the internal components of the iPhone that handle the phone calls and Internet access. This ‘baseband’ is a tiny and unique independent computer system that runs inside your iPhone, it is separate to the main system that handles the applications (such as email and google maps) and it talks to the main part of the phone over an internal communications network.

Think of it like a cable modem or other peripheral that is attached to your home PC that needs occasional updates. When a software update is released and presented to you within iTunes the baseband is sometimes updated (to fix bugs or add new features).

The 3.1.2 update for the iPhone 3G and 3GS contains such an update, so running the vanilla updater straight away with iTunes will reprogram and update the baseband.

How to jailbreak your iPhone with BlackRa1n RC3:

Step 1: Update iTunes to the latest version available and reboot your computer.

Step 2: Download BlackRa1n RC3 and install it.

Step 3: Plug your iPhone in your computer and launch BlackRa1n RC3. Click on “make it ra1n

Step 4: Your iPhone will enter recovery mode. The regular recovery mode image on your iPhone will be replaced by a picture of GeoHot

Step 5: BlackRa1n will run on your iPhone and then it will reboot.

Step 6: Once your iPhone reboots, you will have a new icon on your springboard. This is BlackRa1n. Now make sure you have internet connection and launch BlackRa1n on your iPhone.

Step 7: Choose what installer applications you want to install on your iPhone and then tap “Install. I recommend installing Cydia, if you need to unlock your phone to use on other GSM carriers then choose to install sn0w as well.

Step 8: Once Cydia is installed. You can safely uninstall BlackRa1n by launching the app and selecting “uninstall balckra1n and rebooting your phone.

Last edited by shabbypenguin (2009-11-09 14:23:41)