Step 1: PwnageTool 4.3.2 for Mac OS X.
Step 2: Download iOS 4.3.2 firmware for iPhone, iPad, iPod touch or Apple TV.
Step 3: Start PwnageTool in â€œExpert modeâ€ and select your device:
Step 4: Browse for iOS 4.3.2 firmware for your device as shown in the screenshot below:
Step 5: Now select â€œBuildâ€ to start creating custom 4.3.2 firmware file:
NOTE: If you are with unofficial carrier, and want to preserve the old baseband so that it can be unlocked using Ultrasn0w, make sure you check â€œActivate the phoneâ€ option which is found under â€œGeneralâ€.
Step 6: PwnageTool will now create the custom .ipsw file for your iPhone which will be jailbroken.
Step 7: Now follow the following steps to enter DFU mode using PwnageTool:
Step 8: Start iTunes, click on your iOS device icon from the sidebar in iTunes. Now press and hold left â€œaltâ€ (option) button on Mac, or Left â€œShiftâ€ button if you are on Windows on the keyboard and then click on â€œRestoreâ€ (Not â€œUpdateâ€ or â€œCheck for Updateâ€) button in the iTunes and then release this button.
This will make iTunes prompt you to select the location for your custom firmware 4.3.2 file. Select the required custom .ipsw file that you created above, and click on â€œOpenâ€.
Step 9: 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 donâ€™t do anything silly. Just wait while iTunes installs the new firmware 4.3.2 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 4.3.2.
How-To Unlock iOS 4.3.2:
Ultrasn0w 1.2.2 for unlocking iOS 4.3.2 is now available for both iPhone 4 and 3GS. You can use it to unlock iOS 4.3.2 (compatible basebands: 01.59.00 / 04.26.08 / 05.11.07 / 05.12.01 / 05.13.04 / 06.15.00) on your iPhone 4 and 3GS, step by step instructions for which can be found here.