Upgrade an old Jailbroken iPhone to firmware 3.0: Part 2

Download of 3.0 version might take a lot of time depending on you internet bandwidth.

Once the download of OS 3.0 completes, the installation process will start automatically. The installation seems to be doing lot of things and I have been patiently watching it doing things.

For most part the installation process, it has been showing a message "Restoring iPhone firmware..."

OK, after showing the above status message for long, the iPhone has got restored and it's in a completely locked state and asking for a valid SIM. The SIM that I use is not iPhone supported and that is the reason I had jailbroken it when I had started using iPhone.

So, with this exercise,one thing is verified that a jailbroken iPhone cannot be directly upgraded to another jailbroken higher version of firmware. And an upgrade of firmware will always take you to a locked state and you will have to go through the jailbreaking exercise all over again. I had jailbroken my iPhone using ZipPhone utility 18 months back. I am not sure at this point if the same ZipPhone utility is going to help me jailbreak again or not. I am going to try it out and update the blog soon....the struggle to bring the iPhone back continues..........

While I look around for options to jailbreak and then unlock, some of us confuse about the terminology. Let me define the terms for everyone's clarity:

Jailbreaking: make the phone able to accept 3rd party application.

Unlock: make the phone work with other carrier beside AT&T.

In other to unlock, one must jailbreak the phone first, so that you can install an application, to make the phone work with all carriers.

So here you go with unlocking the updated software.

Prepration:

1. download "redsn0w.exe" from dev team blog ( official blog of apple developers)
http://blog.iphone-dev.org/post/126908912/redsn0w-in-june

2. download an appropriate boot loader file from http://www.quickpwn.com (*.ipsw file)

3. download BL-39.bin and BL-46.bin (iPhone bootloader 39 and 46) ( search google and you will get lot of sites from where you can download it.

4. Launch redsnow.exe from your windows machine (downloaded in step#1) and follow the instructions CAREFULLY.

Part 1