Strange problem updating the bios

[LorenzoMartone]

Hi ti all, these is my first post.
Please I need you help with a DFI NB70-SC motherboards bios updating.
From many years I update without any kind of problem the bios of my motherboards, but with this model is impossible.
I downloaded from the DFI site (www.dfi.cm) the latest revision of the NB70-SC bios NB70SC0205.ZIP .
In this file you can find a bin file and awdflash.
When you try to update the bios you obtain a warning message:

Checksum Error, this bios is not original, not download this file from this motherboard

I've tried to download again the bios but it's always the same story.
I've tried to update my bios with a Win98 boot floppy, with a Windows XP boot floppy but it's the same.
In The motherboard bios I've deselected the option "bios update protection" so it's not a motherboard setting problem.

My configuration is:
P4 1800 Northwood
DFI NB70-SC
256mb DDR 2,5 OEM
Creative Ti4400 GeForce 4
Creative Soundblater Audigy Player
Maxtor 40 GB 7200rpm ATA133

This system works perfectly, I obtain these error message only when I try to update my bios.
Thank you for your attenction.
Lorenzo :Q

 

[LorenzoMartone]

This is The DFI suggest (I've received this mail 5 minute ago)
Dear User:
Thanks for your support our product. According your problem. Please type in the follow command under DOS prompt:
A:\>[executable] [filename].bin /sy/py/f
Then reset your computer after the completion of BIOS flash process