HTC have a new software update available for Orange customers by visiting the HTC support page online and following a few simple steps.
Nothing yet on what exactly is upgraded or fixed with this new version but any new version is more than welcome for the HTC handset which is still being sold here and there.
Follow the link below to update your Tattoo but please make sure you read the T&C first as you will loose any data not backed up
Link: HTC Software Update