UPDATE: Froyo update details for HTC Aria/HTC Legend now shown at HTC SEA Support page.
Your phone will receive a notification when the update it is made available. Simply press OK to get the update going. Considering the previous OTA Froyo update for the HTC Legend is over 80MB big, we’d recommend you connect to a WiFi network before proceeding.
To confirm a successful update, from the Home Screen, go to MENU> Settings> About Phone> Software Information> Build number. The new Build number after the update will be 2.37.708.5. Update: Android 2.2 and HTC Sense update.
Thanks for the tip goh