Trouble updating original iPhone

I have the first iPhone and I am having a lot of difficulty trying to update it. It currently is version 2.2.1 and iTunes tells me that I can update my phone to version 3.1.3, but whenever I try to do so, it doesn't let me. The first time I ever tried updating my iPhone it went through the whole process, but at the very end, after two hours, a message popped up saying that the update failed. Today I tried again, but when I clicked 'update' it only said that iTunes was already updated and nothing about my iPhone. After several more tries iTunes froze numerous times and did not recognize my iPhone when I plugged it in.
Is this because you can no longer update the original iPhone? Or is it something else?
I read about backing up and restoring the iPhone, and I was able to successfully back it up a few hours ago, but I am a bit hesitant on going through the restoring process because iTunes is acting up right now.
Any sort of help would be appreciated.
Thank you!

Sorry to hear your having problems, and I'm not sure what the cause might be. The information I have is that 3.1.3 is the latest version of the iOS that you can run on your iPhone.
The only thing I can think if is if there is not enough free space on your iPhone, that could be causing issues with the installer.

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