The Google has officially announced that they has just started to send the OTA (over-the-air) of the final version of Android 2.2 (that is also known as Froyo). This OTA (over-the-air) software update will reach the phones gradually so you’ve to wait until the update hits your Nexus One.
This Android 2.2 Froyo software update will bring some great new features which includes support for making your Nexus One a portable hotspot, ability to play Flash videos using the Adobe Flash within the browser, and lots more.
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According to the official news and update website of Google Nexus One:
In order to access the update, you will receive a message on your phone’s notification bar. Just download the update, wait for it to install, and you should be all set. This update will be rolled out gradually to phones – and most users will receive the notification by the end of the week . We hope you enjoy these new features.