HTC has officially announced a ROM Upgrade for HTC Tattoo (Orange), as you know HTC is committed to providing customers with the best possible mobile experience.

The download instructions are listed below.

.Installation Instructions

Before you proceed the ROM Update Utility (RUU), please confirm the following items:

(1) This software upgrade is a newer version than what is currently installed on your phone. If it is the same version and your phone is operating normally, there is no need to reinstall the software.

To check what version is installed on your phone, press Home > Menu > Settings > About phone > Build number, and note the Build number.

(2) HTC Sync has been installed on your PC. HTC Sync can be found on the MicroSD card that was shipped with your phone. You can also download and install HTC Sync at www.htc.com/www/support/

(3) Your phone is connected to your PC using a USB cable. The PC must recognize your phone. You will see a sync icon HTC Sync Icon.bmp in the taskbar once the phone has been connected.

(4) Standby and hibernation mode on your PC has been disabled.

(5) Close all running applications on the PC.

(6) The Screen unlock pattern has been disabled, press Home > Menu > Settings > Security and uncheck Require pattern

(7) Make sure that the battery level of the phone is at least 30% (at least 3 green blocks). To check the battery level, tap Home > Menu > Settings > About phone > Status > Battery level.

(8) Once the RUU is downloaded, launch the application on your PC and follow the instructions on screen.

source: HTC