I have a Dell 690 fitted with one Xeon DP 5060 3.2GHz with BIOS A02. I want to add a second processor and have bought one (acturlly two) on eBay. I can't get them to work. I get a message processor mismatch. I have checked and all three processors are indentical. No pair will work together. I have been advised to upgrade the BIOS. However, I cannot find an update to the A02.