To upgrade the BIOS for a Promise Ultra100 TX2 controller card sold under the Western Digital brand name, please go to the Western Digital support page at http://support.wdc.com/download/#promise
How to install the Ultra100 card on an existing NT 4.0 Operating System. Please always backup first! This may not always work correctly due to Drive Geometry issues between the onboard IDE/ATA Controller card and your promise product.