IPhone 3G - unable to update iPhone software due to syncing + back-up process always crashed half way.

- I'm having problem to update my current iphone software (3.1.3 version) to the latest version due to my itunes + iphone unable to complete the syncing + back-up process.
- It always crashed + syncing half way and sadly it always happened after waiting for couples of hours (sometimes more than 6 hours).
- I have tried it soooooo many times but again it still disappoint me.

What "latest version" are you attempting to upgrade to? The iPhone 3G can use up to iOS 4.2.1; any later version will not install. And you might want to stick with 3.1.3 as many people report unsatisfactory performance of iOS 4 on the iPhone 3G.
If you're sure you want to upgrade, and you're sure you are attempting to install iOS 4.2.1 and not some later version, then try a factory restore operation on your phone first, then try again to update the iOS:
http://support.apple.com/kb/ht1414
If that doesn't work, you might want to call your local Apple Store to make an appointment at the Genius Bar. They'll probably be happy to help you perform the software update right in the store. If you use a laptop to sync your iPhone, bring that (and the USB charge/sync cable) with you.

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