No option for software updates

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http://androidforums.com – Hey guys i just got a new HTC Desire hd and iv been told by many ppl to update my software. When i went to Settings\about phone There is no software update option. the only thing i see is Network, phone identity, battery, hardware info, software info and legal info. Please help me out as im quite lost. Sofware info is 2.3.3 htc sense 3.0 software number is 1.28.401.1 (General)