i could not update to 9.3.6 my iphone 4s using the itunes?

Hi MohammadEakubAli,

It sounds like you need help updating your iPhone, and I want to help.

Are you receiving an error when you are trying to update your iPhone?

iPhone 4s should be compatible with iOS 9.3.6 according, and connecting to iTunes is a great way to update.

Here's how you can update your iPhone:

Update your iPhone, iPad, or iPod touch - Apple Support

Here are the steps to take if iTunes isn't recognizing your device:

If iTunes doesn't recognize your iPhone, iPad, or iPod - Apple Support

Let me know if that helps. Otherwise, tell me more about what happens when you try to update. It would be helpful to know if you're using a Mac or a PC and which version of iTunes you're using.

Thanks for using the Apple Support Communities.