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iOS 4.3.5 was recently released by Apple to fix a security issue with certificate validation.Thankfully Redmondpie Team has cooked a custom PwnageTool bundle that will allow you to jailbreak iOS 4.3.5 and Preserve Baseband unlock.

Heres what you will need:

• iOS 4.3.5 IPSW for iPhone 4 [Download]
• iTunes 10.4 [Download]
• PwnageTool 4.3.3 [Download]
• PwnageTool Bundle [Download]
• tethered-boot utility [Download]

Warning:
If your baseband is 4.10.1 Do not update to iOS 4.3.5 as there is no unlock for it now. Modify PwnageTool For Custom Bundle

Step 1: extract the custom bundle we mentioned above and drag it to your desktop.

Step 2: drag the PwnageTool app to the /Applications folder but do not launch it yet. Instead, right-click it and select Show Package Contents, in order to insert the bundle. For reference, check out the screenshot below.

Step 3: you should now see a Finder window identical to the one below. Navigate over to Contents/Resources/FirmwareBundles/ and place the .bundle file you had selected earlier to this location, then close the window.

Creating Custom 4.3.5 Firmware

Step 4: start up PwnageTool in Expert mode, as shown on the screenshot below. Select the device you’re using, then click on the blue arrow on the bottom-right corner of the window to proceed.

Step 5: when requested, point PwnageTool to the iOS 4.3.5 IPSW file you downloaded earlier, as shown in the screenshot below.

Step 6: on the next screen, you’ll be given the option to further customize the software you’re about to build. Feel free to toy around with these settings, but only if you know what you’re doing. If you’re not sure what to do, just click on "Build" as shown below. PwnageTool will then build a jailbroken firmware, a process that could take a few minutes, so kick back and have a soda.

Step 7: when instructed, you need to put your phone into DFU mode. Just do as follows:

Hold down both the Power and Home buttons simultaneously for 10 seconds.
Release the Power button but keep holding the Home button for 10 more seconds.
If your screen is black, you’re in DFU mode. If an iTunes logo is displayed, you’re in Restore Mode: just try the steps above a few more times, sometimes it doesn’t go well on the first try. Nonetheless, a notification will be displayed if you’ve managed to enter this mode correctly.

Restoring Custom 4.3.5 Firmware On iPhone

Step 8: once this process is done, you’re free to exit out of PwnageTool. Now launch iTunes and restore to the firmware file you’ve just created: select your device from the iTunes sidebar, and click Restore while holding down the Alt key on your keyboard. Select the firmware file you’ve just saved (make sure it’s the one created by PwnageTool, not the default firmware) and click Open. iTunes should now begin loading the jailbroken firmware to your device, avoid interacting it at this point. If everything goes as expecting, your device should be jailbroken at this point.

Booting iPhone In Tethered Mode

Since this is a tethered jailbreak, whenever you boot up your device you’ll have to plug it into your computer and run a small utility known as tetheredboot. You’ll need to follow the following Step 11 and Step 12 whenever you start up your device!

Step 9: place tetheredboot (download link at the beginning of the article) in an accessible directory.

Step 10: change the extension of the custom IPSW file you’ve just created to .zip by renaming the file, then extract it much like a real ZIP file. Navigate to /Firmware/dfu/ and copy two files (kernelcache.release.n90 and iBSS.n90ap.RELEASE.dfu) from that directory to the folder you’ve pasted tetheredboot utility into, as shown below.

Step 11: with your device plugged in but turned off, bring up the Mac OS X Terminal (by heading to Applications/Utilities/Terminal), type in the following commend, press enter and insert your password when requested:

sudo -s

Then type in the following:

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

if the commands above don’t work, try the following:

/Users/TaimurAsad/Desktop/tetheredboot/tetheredboot –i
/Users/TaimurAsad/Desktop/tetheredboot/iBSS.n90ap.RELEASE.dfu -k
/Users/TaimurAsad/Desktop/tetheredboot/kernelcache.release.n90

Important: Make sure you replace /Users/TaimurAsad/Desktop/tetheredboot/ with the directory where you have placed the tetheredboot utility.

If you’re not comfortable typing in commands, you can simply drag the 3 files in your tetheredboot folder right into the terminal window after the original sudo -s command.

Step 12: after some code runs through the terminal, you’ll be asked to set your phone into DFU mode. Do so, as shown below:

Hold down both the Power and Home buttons simultaneously for 10 seconds.
Release the Power button but keep holding the Home button for 10 more seconds.
If your screen is black, you’re in DFU mode. If an iTunes logo is displayed, you’re in Restore Mode: just try the steps above a few more times, sometimes it doesn’t go well on the first try.

If you wait a few seconds, you should see “Exiting libpois0n” on the terminal. Your device is now in a jailbroken state until next time you power off.

As you know that Apple has released iOS 4.3.5 to fix security issue. The good news is that some guys have confirmed that current Redsn0w version can jailbreak 4.3.5 iPhone 4, 3GS, iPod Touch 4G, 3G, iPad 1.

As we reported you that this jailbreak is still tethered jailbreak which means that you will need to reconnect your iDevice with computer every time your reboot iDevice.

[h=2]Jailbreak 4.3.5 iPhone 4, 3GS, iPod Touch 4G, 3G, iPad:[/h]

Step 1: Download iOS 4.3.5 and iOS 4.3.4 (required by this version of Redsn0w) firmware file for your device from the links given at the end.

Step 2: Download Redsn0w 0.9.8b4 for Windows or Mac. Also make sure you are running the latest version of iTunes, which is version 10.4.

Step 3: Now start Redsn0w, browse for the iOS 4.3.4 firmware file (NOT the 4.3.5) that you downloaded in Step 1 and point it towards Redsn0w. Refer to the screenshots below:

Step 4: Once Redsn0w is done recognizing the firmware file, click Next and there you’ll be taken to a new window. Simply check the “Install Cydia” box as shown below and leave other options as it is for now. Once done, click Next.

Step 5: On this screen, Redsn0w will instruct you to power down your device and plug it in to your computer. Follow the onscreen instructions and then click Next to continue.

Step 6: On this screen you will have to put your device in DFU mode with a combination of the Power button and the Home button for a certain amount of time, simply follow the onscreen instructions on how to do so. The combination is usually like this:

• Hold down Power button for 5 seconds.
• Now without releasing the Power button, hold down the Home button simultaneously with the Power button for 10 seconds.
• Let go of the Power button but keep on holding the Home button for another 15 seconds.

If you performed the above mentioned steps correctly, then your device should be in DFU mode.

Step 7: Redsn0w will now jailbreak your device, don’t do anything weird at this point, just let Redsn0w finish. We would recommend that you don’t do anything with your PC or Mac at all during the process. Sitting idle and waiting for the process to end on its own is much advised.

Since this is a tethered jailbreak, therefore whenever your iOS device loses power, it will go into the dreaded Apple logo boot screen loop. To get out of that, simply start from Step 3 again and in Step 4, uncheck “Install Cydia” and instead check “Just boot tethered right now” option and hit “Next” with your iPhone, iPad or iPod touch connected to your PC or Mac. And yes, you will have to do this every time when your device reboots or loses power.

That’s it! You should now have a jailbroken iPhone, iPad, or iPod touch running iOS 4.3.5.