Here is a complete guide on how to untether jailbreak iOS 4.3.1 on iPhone 4. Follow the instructions below to jailbreak your iPhone 4 running iOS 4.3.1 on Windows.
Update: How to untethered jailbreak iPhone 4 running iOS 4.3.3 using RedSn0w
Note: iOS 4.3.1 on iPhone 4 is not unlockable yet, so if you have to unlock your device then stay away.
Things You Need
4.3.1 (4 GSM): iPhone3,1_4.3.1_8G4_Restore.ipsw
1 ) Create a folder on your desktop Download RedSn0w and iOS 4.3.1 (links above) and place the files in ‘Pwnage’ folder you just created called Pwnage
2) Download RedSn0w (extract it) and iOS 4.3.1 (links above) and place the files in ‘Pwnage’ folder you just created
3 ) Connect your iPhone to the computer and launch iTunes and select your iPhone from the list of devices, now hold shift button and click on the Restore button.
4 ) Navigate to the Pwnage folder on your desktop and select the 4.3.1 firmware ipsw. Click the Choose button to continue.
5 ) Once iTunes has finished updating your iPhone to the desired firmware open the Pwnage folder on your desktop and launch the redsn0w application from the redsn0w folder we extracted earlier.
6 ) Once RedSn0w opens click the Browse button
7 ) Select the 4.2.1 firmware ipsw we placed in the Pwnage folder on our desktop then click Open. Once the firmware gets verified click the Next button to continue.
8 ) Let RedSn0w to prepare Jailbreak data.
9 ) From this window you can select the jailbreak options you would like make sure Cydia is selected.
10 ) Click the Next button to continue
11 ) Plug iPhone into the computer and make sure its OFF then click the Next button.
12 ) RedSn0w will now guide you through the steps to get into DFU mode. Follow the instructions displayed on your Screen.
13 ) Your iPhone should now reboot
14 ) RedSn0w will then begin uploading the new RAM Disk and Kernel.
15 ) Once uploading is complete you will be notified that RedSn0w is done. Click the Finish button. When your iPhone finishes rebooting (might take 5 minutes or more) it will be jailbroken with Cydia on the SpringBoard.
16 ) Done!
For any help regarding the jailbreak process please leave a comment below, we are here to assist you.
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I tried to follow the instruction.. but then my phone won't get on the network.. it just stays in "searching" forever