I updated the BIOS on my tx2500z to F0.5 when I realized it actually came with F.06. Does anyone know where I can get the F.06, HP.com only has F.05. Solved, see below: Since I downgraded to F.05, Vista cannot find the driver for an unknown Device: "ACPI\HPQ0004". I tried installing the Quick Launch button driver but this didn't solve the problem. Anyone know anything about this unknown device?