Why does phone isn't updated ?

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http://forum.xda-developers.com – Hello! I have a HTC One S. It's unlocked and completely unlinked from any carrier. I bought it like this and I never hacked the bootloader/installed custom ROM (not on this one ^^). My software version is 2.21.401.10 and here's the OTA update : http://fotadl.htc.com/OTA_Ville_U_IC...xl730g7fp1.zip But when I go in the software update menu and I check the updates, it says 'no update available'. So my questions are : 1. Why? 2. Is there a way to install this OTA update manually (but keeping it an 'official' way) ? Thanks! :) (HowTos)