The bios has a CAPsule header that needs deleting,and the 8 and 16MB are joined together as one file,so it will need editing and splitting with a hex editor: https://mh-nexus.de/en/hxd/
Open the downloaded bios with HxD.Select "Edit" -> "Select Block" and enter 0 as the "Start-offset" and "FFF" as the "End-offset" ,or set the "Start-offset" as 0 and enter 1000 as the "Length" .Select "Edit" -> "Delete" or press the Del/Delete key on your keyboard.
Next,select "Edit" -> "Select block" again,enter 0 as the "Start-offset" and 800000 as the length (8 hundred thousand.In hex 800 thou is 8MB) .
Select "Edit" -> "Cut" . Click on "New" then select "Edit" -> "Paste-insert" or you can right click and select "Paste-insert" .
Save the file as 8MB.bin and close the tab.Save the remaining 16MB bios (the length of the file in hex is 1 million, 16MB) and rename the file with a *.bin or *.rom file extension
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