I'm going in search of the information I used to update the bios, I will also see if I can locate the correct bios file for you. Aida32 click here will give you the motherboard serial number / bios number you need to find the correct file.
**Can I also just add, that updating the bios can cause your motherboard to fail & SHOULD NOT be undertaken unless 1. It's absolutely necessary 2. You are confident you can carry out the task 3. You are certain that you will not suffer a power loss during the process (3 minutes or so).**
PS - Bios's can and are updated by computer shops, this is a safer option for those less confident with the method as it offers 100% gauruntees.