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He's on 2.09.405.8 and is trying to update to 2.10.405.2 - the OTA should work...unless you were branded before, in which case you need a gold card to do the update
I didn't get that from his post. The file only contained the same.build as he has. Must be a typo missing 0
there isn't a 2.1, there is:
2.10.405.2 (OTA or RUU)
2.29.405.2 (only availabe as RUU at present)
after downloading the ZIP file, you did rename it update.zip (not update.zip.zip) and run it in recovery and not from a custom recovery didn't you?