Download unlock guide/software at http://www.iphoneunlocksim.com
iPhone 3GS 4.0GM Custom Firmware
*If you use this custom firmware, you can skip the Pwnage Tool step and just install the iTunes 9.2 Beta and Away you go with installing the 4.0GM jailbreak on your iPhone 3GS.
What You Need For This To Work: (click on what it is that you need from below to download what you need)
• iPhone 3GS 4.0GM Firmware
• iTunes 9.2 Beta
• Modified Pwnage Tool(Can be found in the attachment of this post)
• iPhone 3GS that is on 3.1.2 JAILBROKEN with either redsn0w 0.9.4 or blackra1n
NOTE: Your iPhone 3GS must be an older model with old boot rom for this to work.
Okay, let’s begin!
1. Download all the above stuff.
2. Open Pwnage Tool (Modified by me), click on “Expert” mode.
NOTE: No matter what you do, do not check the Activate button.
3. Create your custom firmware
NOTE: While the firmware is being made, you can go ahead and…