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Someone elsewhere has already pulled it apart and determined that it's merely a 2.73.61.66 revision.

thought i'd check for what it says on orange...ROM upgrade for the HTC Hero
An updated ROM is now available to download. It doesn't include any new features or programs but does provide improved handset performance.
- Installed HTC Sync on your PC to allow your phone to connect to it. You'll download and run the update on the PC which will then pass it on to the Hero through a USB cable.
If you don't have HTC Sync installed then click here .- Written down the serial number of your device. You can find it by removing the battery to reveal a white patch with text on it in the format S/N: HTxxxxxxxxxxxxxx or S/N: SZxxxxxxxxxxxxxxxxx.
[*]Backed up or saved all of your data to another location (you can store it on your PC using HTC Sync), as everything in your handset will be wiped once the new ROM is installed.
[*]Confirmed that this software upgrade is a newer version than the one currently installed on your phone. If it's the same version (and your phone is operating normally), you don't need to reinstall.
To check the version installed on your phone, press Home > Menu > Settings > About phone > Build number and note the Build number. If it reads 2.73.61.5 then you're up to date.
[*]Removed your memory card from the handset.
[*]Checked that the battery has a minimum of 50% capacity. To check tap Home > Menu > Settings > About phone > Status > Battery level.
[*]Connected your phone to your PC using a USB cable. The PC must recognise your phone. You will see a sync icon in the taskbar once the phone has been connected.
[*]Disabled Standby and Hibernation mode on your PC.
[*]Closed all running applications on the PC (except HTC sync).
[*]Disabled the Screen unlock pattern on the handset if you have it setup: press Home > Menu > Settings > Security and uncheck Require pattern.
Thanks for the info mez.
If anything it'll give me a bit of practice backing up and restoring etc