How does this equate to a problem? When you update a BIOS it usually clears the information of the previous BIOS, since its a new BIOS and hence you get the checksum error and/or CMOS settings wrong error, simply loading defaults or setting up previous settings will sort that matter out, pretty straightfoward, you'd get the same error if you cleared CMOS or took out the battery for too long. The only way i see this as a problem is if you did enter the bios, and saved but still receive those errors, which i don't see mentioned.