HTC Desire Android 2.2 update

pyesr

Right off the assembly line
I bought a HTC desire phone couple of weeks ago. I want to upgrade the android version to 2.2, However, when I am using the option Menu-Settings-System software updates, I get a message that your phone is upto date. No updates available.

The software information says Firmware version 2.1 update1.
Build number 1.21.720.4 CL175780 release keys

Can someone tell me how to get the upgrade done ?
 
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