HTC has released the FroYo update for Android powered Aria in South East Asia, Hong Kong and Taiwan. While we are not quite sure that HTC ever launched Aria in South East Asia, though it was released in Hong Kong and Taiwan.

Android 2.2 update is available via usual OTA way, you will receive a notification on your devices for the update.  Use Wi-Fi to download the update, to avoid incurring data charges.