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Unlock iPhone 3GS / 3G Baseband 06.15.00 with Redsn0w 0.9.6b5 on iOS 4.2.1 / 4.1 [Windows & Mac]

The iPhone Dev-Team has just released redsn0w 0.9.6b5 to jailbreak iPhone 3GS and 3G on iOS 4.2.1 and update baseband to 06.15.00 which can be unlocked with the newly released ultrasn0w 1.2, the redsn0w 0.9.6b5 is available for both windows and mac users.

The new redsn0w 0.9.6beta5 is out. It gives both Windows and OSX users the ability to flash the iPad 06.15 baseband on iPhone3G or iPhone3GS. It fetches the baseband files directly from Apple for now (the only IPSW you ever point it at is the stock IPSW for the FW on your iPhone right now). There may be a long delay while it’s doing this (their servers are currently getting pounded).

WARNING — YOU DO THIS AT YOUR OWN RISK!  PLEASE UNDERSTAND THE CONSEQUENCES OF UPDATING TO 06.15. READ MORE!

You will need :

Download iOS 4.2.1 for iPhone, iPod touch and iPad
Download Redsn0w 0.9.6b5 for Windows
Download Redsn0w 0.9.6b5 for Mac
Download iTunes 10.1 for Windows or Mac

Here’s the step by step guide :

STEP 1: Download redsn0w 0.9.6b5,  iOS 4.2.1 for your device(download links at the end).

STEP 2: Update to 4.2.1 firmware using the IPSW file you just downloaded via iTunes 10.1.

STEP 3: Launch Redsn0w 0.9.6b5,  and browse for iOS 4.2.1 firmware final version.

STEP 4: Now you have to select “Install Cydia” and “Install iPad baseband”, and then click “Next” (in this step redsn0w will update your baseband to 06.15.00 which works with ultrasn0w 1.2)

STEP 5: Now make sure your device is both OFF and PLUGGED IN to the computer before you click “Next”.

STEP 6: At this stage you will need to put your iPhone in DFU mode by holding “Power” button and then while holding the “Power” button, you will now have to hold “Home” button too. Now after few seconds release “Power” button but keep holding “Home” button until installation begins.

STEP 7: You will Get a Jailbroken Device on the latest iOS 4.2.1  and the unlockable baseband 06.15.00

STEP 8: This step is only for these devices iPhone 4, 3GS (New Bootrom), iPod touch 4G,  3G, 2G, iPad. While this is tethered jailbreak and whenever you want to do anything related to jailbreak like SSH your device, or running Cydia, you must first run your device in the so called “jailbroken state” on every reboot by using “Just boot tethered right now” option.

How to unlock iPhone 3GS / 3G on iOS 4.2.1 / 4.1 using ultrasn0w 1.2 :
This is the final step to get your device unlocked on iOS 4.2.1 / 4.1 with the newly release ultrasn0w 1.2, follow our full step by step guide Posted Here.