here is a step by step tutorial to jailbreak the latest firmwires of your iphone :
Step 1:
Download Sn0wBreeze 2.9.7 Step 2: Unzip and run sn0wbreeze-v2.9.7.exe as an administrator
Step 3: Copy your 6.0 or 6.0.1 IPSW file into the same location of sn0wBreeze .
Step 4: Click Okay > Next > and then Browse for your IPSW.
Step 5: Once you select the proper IPSW file for your device, you should see a message stating that the file was verified. Click next.
Step 6: Click Simple Mode, and select Yes to Hacktivation. Your custom IPSW file will now be created, and it should appear on your desktop.
Step 7: Click OK, place your iDevice into DFU mode, and click Start to put the device into PwnedDFU mode using iReb. The screen on the iPhone should stay black.
Step 8: When detected in PwnedDFU, open iTunes, a device in recovery mode.should be detected
Step 9 :Select your device from the list of available devices, and hold the Shift key on your keyboard while clicking the Restore. Select the custom IPSW file created earlier, and click OK.
Step 10: Your iDevice will restore like normal via iTunes, except this time you should notice a snowflake icon on your screen as it restores the custom firmware.
Step 11: Once your device is finished restoring, go through the normal setup process until you arrive at the Home screen. Swipe to the second page, and you should see Cydia. Since this is a tethered jailbreak, you cannot use Cydia until you perform a tethered boot.
Step 12: Place your device back into DFU mode.
Step 13: Open the iBooty folder located on the desktop and run iBooty.
Step 14: Select your device from the drop down menu, and click Start. The device will now tether boot, so that Cydia will be usable once it arrives back at the Home screen.
Step 15: Once at the Home screen, try opening Cydia. If Cydia opens, congratulations, you’ve successfully jailbroken your device using Sn0wBreeze 2.9.7 .