How to Jailbreak 4.3.1 itouch 4G, 3G PwnageTool [Guide]

PwnageTool bundle has been released to jailbreak iPod touch 4G running the newly iOS 4.3.1, You can use this bundle with PwnageTool 4.2 to create custom jailbroken 4.3 firmware file for your iPod touch 4G. But you have to know that it's still tethered jailbreak which means you will need to restart your iPod touch in a tethered-jailbroken mode on every reboot using tetheredboot utility.
You can follow the guide HERE  (iPhone 4 jailbreak guide) to jailbreak your iPod touch 4G / 3G but with the below changes

• (Changes on Step 1), download iPod4,1_4.3.1_8G4.bundle file and move it to the location as mentioned in the instructions. 

• (Changes On Step 6), select “iPod touch 3G, 4G” option when PwnageTool prompts to select your device. 

• (Changes On Step 7), browse for iOS 4.3.1 for iPod touch 4G.. duh
• (Changes On Step 14), use kernelcache.release.n81 and iBSS.n81ap.RELEASE.dfu instead of kernelcache.release.n90and iBSS.n90ap.RELEASE.dfu

• (Changes On Step 15), use the following commands in Terminal:

Tip: Simply drag and drop in Terminal – tetheredboot file, then iBSS file and then kernelcache.release file.

/Users/TaimurAsad/Downloads/tetheredboot/tetheredboot
/Users/TaimurAsad/Downloads/tetheredboot/iBSS.n81ap.RELEASE.dfu
/Users/TaimurAsad/Downloads/tetheredboot/kernelcache.release.n81

Download iOS 4.3.1 for iPod touch 4G
Download iTunes 10.2.1
Download PwnageTool 4.2
Download iOS 4.3.1 PwnageTool Bundle (with Universal Ramdisk Fixer) for iPod touch 4G

[via RedmondPie]

iOS 4.3 GM Jailbroken Already Using PwnageTool. Here’s A Complete How-To Guide !

Yes you read that right ! The just released iOS 4.3 GM for iPhone 4 has been jailbroken already. The jailbreak though is tethered only for now, which means that you will have to boot it into jailbroken state every time you reboot.

Support for iPad, iPhone 3GS and iPod touches is on the way ! Simply follow the instructions below to jailbreak iOS 4.3 GM on iPhone 4 using a combination of PwnageTool 4.2, Universal Ramdisk Fixer and tetheredboot utility.
Here’s what you will need:

• PwnageTool 4.2
• Access to iOS 4.3 GM firmware
• iTunes 10.2
• Mac OS X
• PwnageTool bundle for iOS 4.3 GM
• Universal Ramdisk Fixer
• tetheredboot utility

Note:

• Cydia is fully working on iOS 4.3 GM.
• It is a semi-tethered jailbreak.
• Your baseband will not be upgraded during restore process.

Modifying PwnageTool
Step 1: Download PwnageTool bundle for your version of iOS device. Extract the .zip folder, in there you will find a .bundle file, for this guide, we are using iPhone 4 bundle iPhone3,1_4.3_8F190.bundle. Move this file to your desktop.
Step 2: Download PwnageTool 4.2 and copy it to /Applications directory. Right click, and then click on “Show Package Contents” as shown in the screenshot below.

Step 3: Navigate to Contents/Resources/FirmwareBundles/ and paste iPhone3,1_4.3_8F190.bundle file in this location.

Creating Custom Ramdisk for iOS 4.3 Custom Firmware
Step 4: Download Universal Ramdisk Maker and simply install it as shown in the screenshots below. This is important because Ramdisk in the current version of PwnageTool is broken. This Universal Ramdisk Maker basically patches it correctly for iOS 4.3 firmware.




Building iOS 4.3 Custom Firmware
Step 5: Download iOS 4.3 GM firmware. Move this file to your desktop.
Step 6: Start PwnageTool in “Expert mode” and select your device:

Step 7: Browse for iOS 4.3 GM firmware for your device as shown in the screenshot below:

Step 8: Now select “Build” to start creating custom 4.3 firmware file:

Step 9: PwnageTool will now create the custom .ipsw file for your iPhone which will be jailbroken.

Step 10: Now follow the following steps to enter DFU mode using PwnageTool:

• Hold Power and Home buttons for 10 seconds
• Now release the Power button but continue holding the Home button for 10 more seconds
• You device should now be in DFU mode

Restore iOS 4.3 Custom Firmware Using iTunes
Step 11: Start iTunes, click on your iOS device icon from the sidebar in iTunes. Now press and hold left “alt” (option) button on Mac, or Left “Shift” button if you are on Windows on the keyboard and then click on “Restore” (Not “Update” or “Check for Update”) button in the iTunes and then release this button.

This will make iTunes prompt you to select the location for your custom firmware 4.3 file. Select the required custom .ipsw file that you created above, and click on “Open”.
Step 12: Now sit back and enjoy as iTunes does the rest for you. This will involve a series of automated steps. Be patient at this stage and don’t do anything silly. Just wait while iTunes installs the new firmware 4.3 on your iOS device. Your iOS device screen at this point will be showing a progress bar indicating installation progress. After the installation is done, your iOS device will be jailbroken on iOS 4.3.
Booting in Tethered Mode
Last but not the least, since there is no untethered jailbreak for iOS 4.3 yet, we will have to boot it into a tethered jailbroken state. To do this, we will make use of a utility named “tetheredboot” as shown in the steps below.
Step 13: Download tetheredboot.zip utility for Mac OS X and extract the .zip file.
Step 14: First, we will need two files from the custom iOS 4.3 GM firmware namely: kernelcache.release.n90 and iBSS.n90ap.RELEASE.dfu. To do this, make a copy of your custom iOS 4.3 GM file that you created above, change the extension of this file from .ipsw to .zip, and then extract this .zip file.
Now copy kernelcache.release.n90 file, and then copy iBSS.n90ap.RELEASE.dfu files which are found under /Firmware/dfu/.
Move all these files, and tetheredboot utility to a new folder named “tetheredboot” on the desktop as shown in the screenshot below.

Step 15: Turn off your iOS device, and start Terminal on OS X and run the following commands:

sudo -s

enter your administrator password, then:

/Users/TaimurAsad/Downloads/tetheredboot/tetheredboot
/Users/TaimurAsad/Downloads/tetheredboot/iBSS.n90ap.RELEASE.dfu
/Users/TaimurAsad/Downloads/tetheredboot/kernelcache.release.n90

You will have to of course replace “TaimurAsad” with the name of the directory on your computer.
now press enter.

You should now see some code running in the Terminal window, at some point, it will ask you to enter DFU mode. Now follow the following steps to enter DFU mode:

• Hold Power and Home buttons for 10 seconds
• Now release the Power button but continue holding the Home button for 10 more seconds
• You device should now be in DFU mode

Now wait for your device to boot, Terminal at this point will be showing “Exiting libpois0n” message. After a short while, your iPhone, iPad or iPod touch will be booted in a jailbroken tethered mode !

UPDATE 1: A new iOS 4.3 PwnageTool bundle for iPhone 4 is now available which eliminates the need of Step 4 above for creating Ramdisk. You can download this new bundle from here.
UPDATE 2: iOS 4.3 PwnageTool bundle for new and old bootrom iPhone 3GS can be downloaded from here.
UPDATE 3: Full jailbreak instructions for jailbreaking iPad on iOS 4.3 can be found here.
UPDATE 4: Instructions on how to jailbreak iPod touch 4G and 3G can be found here.

Jailbreak iPod touch 4G on iOS 4.2.1 with PwnageTool Bundles

The PwnageTool bundle for iPod touch 4G on iOS 4.2.1 has been released by iPhone hacker Johnny. This bundle can be used with the latest version of PwnageTool to cook the pre-jailbroken custom firmware to restore using it and get a semi-untethered jailbreak with Cydia working on iOS 4.2.1.

You can follow the same steps in our previous guide but don't forget to use the iPod touch 4G bundle that can be download from the link below then follow the step by step guide posted here.

Download iPod touch 4G PwnageTool bundle
Download iOS 4.2.1 for iPod touch 4G

Jailbreak iPad 4.2.1 iOS with PwnageTool Bundles

Msft guy has just released the PwnageTool bundle for iOS 4.2.1 GM on iPad. The following bundle is available for download with a patch for broken Cydia. In this post, I will show you how to use this bundles to jailbreak your iPad on iOS 4.2.1 GM and install Cydia on it.

STEP 1: Download PwnageTool 4.1 from the link given here.

STEP 2: Download the latest version of PwnageTool Bundles from msft guy here and then extract it to your desktop.

STEP 3: Copy PwnageTool you have download to your desktop. Right click, and then click on “Show Package Contents”.

STEP 4: Now browse to Contents > Resources > FirmwareBundles.

STEP 5: Now copy the custom bundle iPad1,1_4.2.1_8C148.bundle in its location and close the folder.

STEP 6: Now start the patched version of PwnageTool, select iPad as your device and you will now notice that PwnageTool will automatically detect iOS 4.2.1 GM firmware.

STEP 7: Now, follow the from step 4 to step 7 posted here in our previous guide.

STEP 8: After creating your custom firmware successfully, you will have to restore your iPad to the firmware cooked by patched PwnageTool by clicking on the iPad icon on the left sidebar of iTunes then hold left “alt” button (“Shift” button on Windows) on the keyboard and then click on “Restore” then release the alt button, and select the custom firmware created by PwnageTool.

STEP 9: Download Cydia.patch file for iOS 4.2.1 from here and copy it to /Applications/Cydia.app/Cydia_ by SSH’ing into your iOS device. [NOTE: You must have SSH enabled on your device]

Use Cydia binary from here, start “Terminal” program on your Mac and run the following commands:

mv Cydia_ Cydia.bak

bspatch Cydia.bak Cydia_ Cydia.patch

chmod +x+s /Applications/Cydia.app/Cydia_

STEP 10: Once the installation is done, your iPad will reboot and you'll get a jailbroken iPad on iOS 4.2.1 with a working version of Cydia on it and here's a screenshot for that:

Cydia still crashes when trying to customize categories, but installing and updating packages seems to work OK. Also, the guy is currently cooking a bundle for iPod touch, we'll be back whenever the bundle is uploaded.

Download iOS 4.2.1 GM for iPad [Direct link]

No PwnageTool for Windows

There are some unpleasant news, yesterday MuscleNerd the well-known iPhone hacker spread the pleasant news around the imminent release of PwnageTool for Windows to jailbreak all iOS devices on iOS 4.1 from Chpwn, as you know PwnageTool has never been release for Windows, it's only available for Mac OS X , but now Chpwn has just confirmed that there will not be a PwnageTool for Windows.

Here is what Chpwn said for some users:

2013btuttle1: @chpwn is there an ETA on win pt? I've been waiting... Haha

Chpwn: @2013btuttle1 I don't think it is needed at all. Use limerain greenpoison redsn0w -- all good options.

sheikhali: @chpwn Can we expect PT for Win to go live by the end of this week?

Chpwn: @sheikhali No, there is no need for PwnageTool on ANY platform.

So don't wait for the PwnageTool for Windows, this will be a good news for Sn0wbreeze developers and bad for unlockers as PwnageTool can jailbreak their devices with a custom firmware which mainly preserve the unlockable baseband. You can jailbreak your device using the existing jailbreak tools for all iOS devices on all iOSs in this post.

PwnageTool for Windows

Another good news in the jailbreak community! PwnageTool for Windows, (yes for Windows) coming soon. This is really wonderful news for unlockers who use Windows so they can cook their own custom firmwares with PwnageTool and restore using this cooked firmwares without updating the baseband and keep Ultrasn0w carrier unlock.

That will totally kills the developer behind Sn0wbreeze and it's tool too as it will unusable. MuscleNerd of iPhone Dev Team has confirmed that iPhone developer chpwn will release a new version of PwnageTool to support WIndows.

MuscleNerd: @iH8sn0w seriously...@chpwn is your age, and about to release a better version of PT for win. Don't *blame* him for that.

BaDRaN: @MuscleNerd please we want pwnagetool for windows. Why you don't make it ??

MuscleNerd@BaDRaN9 I think @chpwn is mostly there :) True windows version of PwnageTool by someone in the know.

We'll of course tell you whenever the new version of PwnageTool is available and we'll post full how to guides for that big one, stay tuned! [Thanks everyone who sent this in]

Update: It has just confirmed that PwnageTool for Windows has been canceled , check the details posted here.

Download PwnageTool 4.1.1 to Jailbreak iPhone 4, iPad, iPod touch 4G and Apple TV 2G

Just a quick heads up, iPhone Dev Team has just released PwnageTool 4.1.1 for Mac to jailbreak iPhone 4, iPad, iPod touch 4G, and the new Apple TV. This update is for Mac OS X 10.5.x users who were experiencing some issues with PwnageTool 4.1.

PwnageTool is a jailbreak tool brought to you by the iPhone Dev Team and works only on Mac OS X by creating custom firmwares and it also keep your carrier unlock safe. We already posted full how-to guides to use PwnageTool to jailbreak your device on iOS 4.1.

UPDATE: PwnageTool 4.1.2 is out to fix more issues for Mac OSX 10.5.x and 10.6.x.

Download PwnageTool 4.1.2 for Mac OS X 

Jailbreak iOS 4.1 on All Devices with PwnageTool 4.1 [GUIDE]

Few minutes ago we posted that PwnageTool 4.1 for Mac OS X is available for download; and now here we are back with full step by step guide to jailbreak iPhone 4, 3GS, 3G, iPod touch 4G, 3G on iOS 4.1 and iPad on iOS 3.2.2 using the new version of PwnageTool for Mac; hit the jump for guide.

STEP 1: Download & install the latest version of iTunes & make sure your device is not on iOS 4.1 (links at the bottom).

STEP 2: Start iTunes, connect your device to your computer via USB and sync your iPhone then back your data.

STEP 3: Start PwnageTool and select your devices (iPhone 4 used in this guide).

STEP 4: PwnageTool should automatically detect the correct iOS firmware for your device.

STEP 5: On seeing this message, hit "No" to preserve your baseband to be able to unlock.

STEP 6: PwnageTool will start creating the custom pre-jailbroken firmware for your device.

STEP 7: Follow the instructions seen on the screen to enter DFU mode as shown in the screenshot below:

STEP 8: Now, You will have to restore your iPhone to the jailbroken custom firmware by Clicking on the iPhone icon on the left sidebar of iTunes then hold left “alt” button (“Shift” button on Windows) on the keyboard and then click on “Restore” then release the alt button, Now Select the custom firmware created by PwnageTool and Let iTunes go in a bunch of steps.

STEP 9: Now, i't unlock time! In case you preserved your device's baseband, you can use our step by step guide posted here to unlock iPhone 4, 3GS, 3G using Ultrasn0w 1.0-1.

Download iTunes 10 for Windows & Mac
Download iOS 4.1 for iPhone, iPod touch & iPad
Download PwnageTool 4.1 for Mac OS X

Dev Team Releases PwnageTool 4.1 to Jailbreak iOS Devices for Life

Just a couple of hours back, iPhone Dev Team released a new and updated version of PwnageTool to jailbreak iPhone 4, 3GS, 3G, iPod touch 4G, 3G, 2G, Apple TV 2G on iOS 4.1 and iPad on iOS 3.2.2. This tool is based on creating pre-jailbroken custom firmwares, so, you can upgrade your iOS device using this jailbroken custom firmware.

The most important feature in PwangeTool that it preserves iPhone 4, 3GS, 3G basebands, so you can upgrade to higher firmware without updating your baseband. In brief, it will keep your device unlocked. This tool will untethered all A4 devices (i.e. iPhone 4, iPod touch 4G, iPad, Apple TV 2G) for life. It works on Mac OS X only, we will be back with full how-to guide, stay tuned for that!

Download PwnageTool for Mac OS X

PwangeTool 4.1 Jailbreak ALL Devices [SCREENSHOT]

You have waited long for the new version of PwangeTool to jailbreak all devices on iOS 4.1 while preserving the baseband and keeping the carrier unlock safe. So, iPhone Dev Team has teased us with a screenshot for the new version of PwangeTool and the screenshot is really full with devices.

The supported devices as shown are iPhone 4, iPhone 3GS (new bootrom), iPhone 3G, Apple TV, iPad and iPod touch 4G / 3G / 2G thanks to Limera1n's exploit. PwangeTool 4.1 was set to be launched by previous Sunday but I think it was complicated a lot by the team so they delayed the release. But, the screenshot above indicates that it's coming sooner than later! Stay tuned for that!

PwnageTool to Jailbreak iOS 4.1 on iPhone 4, 3GS, iPod Touch 4G/3G, Apple TV 2G and iOS 3.2.2 on iPad Demoed in Video

MuscleNerd has just shared a two minutes Youtube video testing the upcoming new version of PwnageTool which is based on Geohot's Limera1n bootrom exploit, the new PwnageTool version will allow you to restore custom firmwares without upgrading to 05.14.02/2.10.4 basebands on iPhone 3GS and iPhone 4 to be able to unlock them with the existing version of ultrasn0w. It will be compatible with iPhone 4, iPhone 3GS (new bootrom), iPod touch 4G/3G, iPad and Apple TV 2G.

As we reported earlier that PwnageTool will be released by the next Sunday. Stay tuned, we will keep you informed once PwnageTool go public and as usual it will followed with all step by step guides.

You may also like:

• How to Use:  Limera1n and Greenpois0n. to jailbreak iPhone 4/3GS, iPod touch 4G/3G and iPad on iOS 4.1/3.2.2
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GeoHot's Bootrom Exploit Ported into PwnageTool; Coming on Sunday

You already know that PwnageTool will be released this weekend to jailbreak Apple TV and iPhone 3GS old bootrom while preserving basebands. The big one today is that new GeoHot's bootrom exploit ported successfully into PwnageTool and will be released this Sunday.

iPhone Dev Team member wizdaz has announced the port on his Twitter account few hours ago:

ported new geohot's bootrom exploit into PwnageTool

So, PwnageTool now may work on iPhone 4, iPhone 3GS (both old and new bootroms) and iPhone 3G. You will be able to create custom firmware using the new version of PwnageTool and be able to unlock your iPhone carrier using Ultrasn0w via Cydia. We will keep you updated, stay tuned!

PwnageTool Coming Out This Weekend to Jailbreak Apple TV 2G and iPhone 3GS

Just a quick heads up, PwnageTool is going to be released this Sunday to jailbreak Apple TV 2G and iPhone 3GS old bootrom on iOS 4.1. This was confirmed by iPhone Dev Team member MuscleNerd on his Twitter account saying that Apple TV 2G jailbreak will be covered using PwnageTool on the fun day.

For AppleTV 2G users, the goal is for PwnageTool to cover you by Funday/Sunday (but still very limited app capability)

Of course and as known, PwnageTool will also jailbreak iPhone 3GS old bootrom and it's important for unlockers as it preserves the baseband and save Ultrasn0w carrier unlock. We'll be covering this, stay tuned!

You may also like:

• How to jailbreak: iPhone 4/3GS , iPod touch 4G/3G iOS 4.1 and iPad 3.2.2 with Limera1n.
• LimeSn0w to Unlock iOS 4.1 On its Way By Geohot?.
• Save SHSH Blobs of iOS 4.1 Now, Apple About to Patch Limera1n Untethered Hack [Warning]

Download iOS 4.1 Custom Firmware for iPhone 3G [Jailbroken]

Thus days, there were guides floating on the web of using PwnageTool bundles to jailbreak iPhone 3G on iOS 4.1 by msft.guy. Well, I didn't post this guide because it's really difficult and needs a professional, so, we could get our hands on iOS 4.1 custom firmware already pre-jailbroken works on iPhone 3G. Check the steps below to restore it and jailbreak your iPhone 3G.

Steps:
Step 1: Your iPhone 3G must be jailbroken on older firmware with Redsn0w, Sn0wbreeze or PwnageTool.

Step 2: Launch iTunes 10 and sync your device, back your data by right clicking on the iPhone icon at the left sidebar of iTunes and hit "Backup".

Step 3: You will now have to restore your iPhone to this custom firmware 4.2 (link at the bottom). Start iTunes, click on your phone icon from the sidebar in iTunes. Now press and hold left “alt” button (“Shift” button on Windows) on the keyboard and then click on “Restore” (Not “Update” or “Check for Update”) button in the iTunes and then release the “Shift” button.

Navigate iTunes to iOS 4.2 custom firmware then sit back and wait until iTunes finish a bunch of processes.

Step 4: After installation you may be promoted with errors (just ignore it). After installation, you will have fully jailbroken iPhone 3G works on iOS 4.1.

This custom firmware doesn't upgrade your baseband, so you may need to unlock your iPhone using Ultrasn0w by following the step by step guide posted here. Of course, you may need to downgrade from iOS 4.1 to iOS 4.0.2 / 4.0.1 by following the step by step guide posted here.

Also keep in mind that Sn0wbreeze 2.0 with iReb 4.0 will solve iPhone 3G and iPod touch 2G jailbreak. According to iH8sn0w it works perfect with no errors, Expect the release any time soon.

Download iOS 4.1 Custom Firmware [Mirror 1]
Download iTunes 10

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How to: Jailbreak iPhone 3GS on iOS 4.1 with PwnageTool

While waiting for iOS 4.1 jailbreak release (may be SHAtter?), we will give a guide to jailbreak iPhone 3GS old bootrom only on iOS 4.1 using a modified version PwnageTool from Criminal90 with the help of some other tools which is essential in the jailbreak process.

This guide requires iPhone 3GS old bootrom on 3.1.2 (jailbroken with Blackra1n) or on 3.1.3 (jailbroken with Sn0wbreeze / Pwnagetool not with Spirit). If you have SHSH blobs of 3.1.2 or 3.1.3, use our guide posted here to downgrade, then jailbreak your device and follow the step by step guide below.

Note: Do it on your own RISK, we are not responsible for any damage happens to your device.

Step 1: Download the required files,

• Download iOS 4.1 firmware and save it on your desktop, 
• Download iTunes 10 and install it,
• Download the modified PwnageTool and iOS 4.1 Jailbreaker

Step 2: Launch PwnageTool and connect your iPhone via USB, you should be promoted with a warning message, hit OK to start.

Step 3: Click on Expert Mode button, select iPhone 3GS, then hit the blue arrow.

Step 4: You will be brought to the "Browse for IPSW" page. click on Browse for IPSW and point it to iOS 4.1 you already downloaded above.

Step 5: Now click on "General" to begin the customization,

• Deselect Activate if you have an iPhone legitimately activated on an official carrier.
• Adjust the partition size as you want, or leave it as it's.

Step 6: [Optional] After you end customizations, hit the blue arrow. Now you are in "Cydia" page, through this page you can add repos in Cydia and install applications as you want.

Enter "Manage Sources" section to add repos, then select the "Download packages" tab and click the Refresh button to display all the available packages. Double clicking the package you want will download it and make it available in the "Select Packages" tab. Make sure that everything is fine and hit the blue arrow.

Step 7: In this page, you can uncheck both Boot logo and Recovery logo to keep default Apple's logos or click on "Browse" to replace them with another image then hit the blue arrow.

Step 8: Now the Pwnage process will start, select "Build" button to start building your custom firmware. You will be asked to locate the place to save the custom firmware, select anywhere (i.e. desktop) and hit "Save". Building the firmware process will start.

Step 9: The process will take up to 10 minutes. While creating the custom firmware you will be asked to write your system password, DON'T write it! Instead, install iOS4.1Jailbreaker installer package (downloaded above with PwnageTool) and hit "Continue" twice and write the admin password if required.

Step 10: Now switch back to PwnageTool and type in your password. You will get a pop-up that will tell you to put your iPhone in Recovery Mode and restore with iTunes.

Step 11: Now launch iTunes, sync your device. Once in iTunes, hold the Alt / Option key and click Restore. Locate the create ipsw file, click OK and let iTunes extract, verify and restore your iPhone 3GS.

Step 12: Now you have to get out of recovery mode, download TinyUmbrella, launch it and click on "Kick Device out of Recovery Mode"

Step 13: Well done, you have an iPhone 3GS on iOS 4.1 jailbroken and you will find Cydia on your home screen. But you may face this problems:

• If Cydia has a blank icon (no repos) load it go to Manage > Sources > Edit > Add and add http://apt.saurik.com/cydia-3.7
• If Safari web browser is crashing, add http://repo.woowiz.net repo and install Safarifix

How to: Unlock iPhone 3GS on iOS 4.1:
To do so, you need to be activated on original SIM or Phonebook card. Follow our guide posted here to unlock iPhone 3GS on any baseband using Ultrasn0w 1.0-1.

Now a lot of people still not happy, but the world will be free very soon by the next jailbreak from pod2g with the help of p0sixninja. Just stay tuned and we will keep you updated.

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How to: Jailbreak iPhone 3GS on iOS 4.0.2 with PwnageTool [UnOfficial]

Now, you can jailbreak your iPhone 3GS (Old Bootrom) on iOS 4.0.2 using the unofficial release of PwangeTool, As you know, you don't need to update to iOS 4.0.2 as the iPhone dev team announced with PDF Patch which close security holes on all Apple devices! but in case you already upgrade to iOS 4.0.2 and can't downgrade so here's a quick guide to jailbreak your iPhone 3GS on iOS 4.0.2 below,

Steps:
Step 1: Download and iTunes 9.2.1 from Here, and the Original iOS 4.0.2 from Here
Step 2: Start iTunes, Sync your iPhone with your PC or Mac and backup all your data by Right click on your iPhone and click on "Backup"
Step 3: Now, Download the UnOfficial PwnageTool from Here
Step 4: Launch PwnageTool you have just Downloaded, Then choose your Device and Click on the blue arrow

Step 5: Now PwnageTool should detect the correct original firmware of your Device, Check on it and Click on the blue arrow
Step 6: When PwnageTool asks you “Do you have an iPhone contract that would activate normally through iTunes?” Click "No"

Step 7: A menu of several options will appear, Check on General and Choose your settings
Step 8: After choosing your Options, Check on Build and Hit the Blue arrow

Step 9: Now, PwnageTool will ask you to Save Custom Firmware, Choose the place you want then Save it
Step 10: PwnageTool will now create the custom .ipsw file for your iPhone which will be jailbroken.

Step 11: Once the .ipsw file created, navigate to itunes, Click on iPhone on the left, then hold left “alt” button (“Shift” button on Windows) on the keyboard and then click on “Restore” then release the alt button
Step 12: iTunes now should ask you about the .ipsw file, head up it to the created custom firmware by PwnageTool

Step 13: Now, Sit back and let iTunes do it.. After several steps of installing the new firmware, Your device should be Jailbroken Successfully

In case you want to jailbreak iPhone 3G on iOS 4.0.2 you can use Redsn0w for both Windows and Mac by following the guide posted here.After done with the jailbreak, then you can follow the step by step guide posted here to unlock any device using Ultrasn0w 1.0-1.