Bios not load default CheckSum error

Hello,
I had to update my bios from 060215 versiyon to 080307 versiyon ... But I cannot to save any changes... date and boot device and pci/agp...
How can I return to old versiyon bios firmware? I don't have floppy I must to use usb flash disk for booting I have on flash disk both versiyon bios and afu dos files. Helpme please. PC dont permission for bios change.... my motherboard is ECS M800PRO-M478 V.1.0
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More about bios load default checksum error
  1. Excuse me! I forgot to write my motherboard... ECS M800PRO-M478 V.1.0
  2. Did youmake any recent hardware change? Ensure that your CMOS battery is working fine.
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