My iphone 4s is not updating or restoring after trying to update to ios 9?

My iphone 4s is not updating or restoring after trying to update to ios 9?

Added (1). I have tried updating with iTunes from my Macbook Pro, everything is up to date i made sure of that. However after extracting software it will continue to install it on the iPhone, and when it gets to just over half way, it will stoop in the exact same location overtime then i will receive an error message from iTunes saying "The iPhone could not be updated. An unknown error occoured (50).

I'm surprised 9 was available for it

anyway, google your problem, you can be certain others will have the same issue

You've probably hit the ultimate lag. These updates are good for 6 users and are essentially designed for them, but anything before that will slow down dramatically and there will be heaps of problems. I'm afraid you've hit one of those problems, gg

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