How to update from 3.1.3 to 4.3.3, but not to 4.3.5?

Question

Hi, I want to know how to update from 3.1.3 to 4.3.3, while the newest iOS version is 4.3.5
I think Apple won't let me update to 4.3.3. Does anybody know how to do it?
Your answer would be deeply appreciated. Thank you

Answer 1

UPDATE TO IOS 4.3 MANUALLY(CANNOT UPDATE TO 4.3 BY APPLE SOFTWARE UPDATE)
FIRST= Download the iOS 4.3 IPSW file for your device FROM NET
SECOND- Connect your device to the computer using the USB cable and wait for iTunes to detect it.
THIRD- Once your device has been detected – follow the steps given below for different OS.
For Windows – Hold the Shift key and then click on the "Check for Update/Update" button.
For Mac OS X – Hold the Option key and then click on the "Check for Update/Update" button.
4-
In the next dialog browse to the file that you downloaded from Step 1 and select the IPSW file.
5
iTunes will now use the IPSW file and update your device to iOS 4.3. The process should take around 10-20 minutes.
That’s it. Your device will be updated to iOS 4.3 with ease.