Help me: Samsung Dvd-r120

Hi

I’ve a Dvd recorder samsung dvdr120( pal region 2): I downloaded the new firmware and flash files from samsung.com the file is named 20051031102814468_R120_EU.zip
in the Zip there are two files: 1) 050721_01_R120E.RUF and 2) B24Z.zip inside of witch there is B24Z.rec.

The manual says I have to put the two files in the cd to update firmware and flash.
Now I ask what files 050721_01_R120E.RUF and B24Z.zip?
or
050721_01_R120E.RUF and B24Z.rec ?

Thanks
Giuseppe