HTC Europe has announced the latest firmware update for HTC Desire S device is currently available through Over The Air (OTA) update for European HTC Desire S owners. This announcement was firstly discovered via the company's tweet:
If you are an European, you can procceed to update your firmware, after firstly accepting the terms and conditions. And wise man says: "Do not take any action, before all your data is backed up".
It is recommended to use Wi-Fi connection to download the firmware, rather than 3G. Because it's faster and money saver.