The tweet you can see below let us know that the updated ROM for HTC Hero, version 2.73.771.73 is now available. You just have to access this website to download it and follow the steps mentioned there.
This is a 3UK version of the ROM and if you’re wondering about requirements, know that your PC must sport a 1 GHz or higher CPU and at least 512 MB RAM for the update to work. 150MB will be taken on your hard disk and an USB 2.0 will also be required. Before you proceed with the upgrade, you must make sure that this software is newer than what you already have installed.
Also, you should check if HTC Sync is installed on your PC and you should know that this software is usually found on the microSD card that comes with your smartphone, but it can also be downloaded from the HTC website.