Downgrade iPhone 3GS / 3G 06.15.00 To 05.13.04 Baseband

Please Follow the steps mentioned below:-

Step 1: Download the latest version of Redsn0w, which is 0.9.14b1 (Windows/Mac), make sure that you have the correct version of said tool for your operating system.

Step 2: Unzip the contents of the downloaded compressed file and save to a familiar location on your PC or Mac.

Step 3: Download the IPSW file of iOS which is currently running on your device, use the search bar on the right-hand side of this post to hunt for the required files. Once downloaded and saved to a safe location, move to the next step.

You can check which version of iOS you are running by going to Settings > General > About > Version.

Step 4: Launch Redsn0w and click on the Extras button on screen.

Step 5: Now click on the Select IPSW option. Point Redsn0w towards the IPSW file which you downloaded in Step 3. If you’re already running iOS 5.1.1, then point it towards that said firmware and so on. Click on Open when you’ve found the required IPSW.

Step 6: Redsn0w will now ask you whether if you have an older bootrom iPhone 3GS or a new one, read the on-screen instructions very, very carefully before you proceed, as it may potentially lead to the loss of data on your device, or may even brick your device’s radio for good.

Step 7: Now go back to the main screen of Redsn0w and click on the Jailbreak option. After preparing the jailbreak data – which takes a little while – you will be presented to a set of different options.

Step 8: Simply check the Downgrade from iPad baseband and Install Cydia options and click Next. If you’re already jailbroken and have Cydia installed then you do not have to check the Install Cydiaoption.

Step 9: At this point, make sure your device is powered off and unplugged. Read the on-screen instructions on how to put your device in DFU mode, don’t worry it might take a couple of tries to get it right. Once you’re ready, click Next.

Step 10: When you’re into DFU mode, Redsn0w will do it’s thing and proceed with the downgrade of your baseband, don’t be alarmed as this step might take a while, so be patient. And best of all; do not touch your device during the whole downgrade process.

Step 11: If you followed the steps correctly, your iPhone will reboot and will be on the unlockable 05.13.04 baseband. Simply launch Cydia and use the latest version of Ultrasn0w to unlock your device.

Note: Before you begin, it’s necessary to note that this method will only work on devices which are running the 06.15.00 baseband i.e. iphone 3GS/3G.

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Downgrade iPhone iOS4 4.0.2 to 4.0.1

Steps to Downgrade the iPhone iOS4 4.0.2 !

1. Download the Firmware version 4.0.1 from HERE.

2. Backup your iPhone through iTunes.

3. Put iPhone into DFU Mode :-

(1). First, Open up iTunes, plug in your iPod Touch/iPhone to the CPU's USB port. Turn on your CPU's speaker and make sure it is loud enough that you can hear it.

(2). Hold down the  Home button (top left for iPod Touch and top right for the iPhone with the screen facing you) and the Power button (located on the front bottom of your iPod Touch/iPhone) simutaneously, until the screen goes black and the device turns off. (past the red slider/slide to power off screen)

(3). Now let go of the  Power button, but continue to hold the Home button. Your iPod Touch/iPhone should have turned off and the screen should not be on.

(4). After around ~10-20 seconds, you will hear a noise (beep/ding) from your CPU as if it had just recognized a new hardware device, now iTunes should recognize it in DFU mode.

(5). After iTunes recognizes the iPod Touch/iPhone, let go of the  Home button otherwise it will go into recovery mode and you will have to do the entire DFU process over again.

(6). You will know when you have put your iPod Touch/iPhone correctly into DFU mode when the display is blank and that you do not have anything on your device.

4. Press Shift+Restore and select the Firmware 4.0.1 and Downgrade your iPhone to Firmware 4.0.1 from 4.0.2.

5. Thats it ! You are Done.


If you need to JailBreak it further click on this LINK

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How to Downgrade iPhone 3.1.3 Baseband 05.12.01

These steps are not for 3GS users, it can only be possible for iPhone OS 3.1.3 with 05.12.01 baseband and older bootloader 05.08. Fuzzyband supports iPhone 3.1.3 to downgrade your 05.12.01 baseband to the older 04.26.08 which you have accidentally upgraded it.


Step1: To downgrade your baseband from 05.12.01 to 04.26.08, you must first jailbreak your iPhone 3G running firmware 3.1.3 by using any of one these guides: Redsn0w 0.9.4, Sn0wbreeze 1.5, Pwnage 3.1.5
Step2:After you have jailbroken your iPhone, Go to “Cydia” on your iPhone and Search for “Fuzzyband” and then install this application.
Step3:Start “Fuzzyband” app and touch on “Downgrade” button to downgrade your Baseband from 05.12.01 to 04.26.08.
Step4:You should now be able to perfectly unlock your iPhone 3G using the latest version of Sn0wbreeze  1.5 by following the step by step guide posted in my Next Blog.

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