My iphone 4 which is never jailbroken cannot be updated to 4.3.5

I cannot update my iphone iOS from 4.3.4 to 4.3.5
When I clicked Update in itune, it failed and showed "There was a problem downloading the software for the iPhone. An unknown error occurred (-23)."
Is there anyone having the same problem or having the solution to figure it out?
Thanks

Same problem here. When it says I should try to *only download* and then manually install.
Then I set *only download* and even though I have a good speed connection, it says it will
take about 100 hours to download!

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