m0n0wall Forum - Could not burn to CD

I have downloaded the cdrom image from http://m0n0.ch/wall/download.php?file=cdrom-1.3b13.iso (the checksum are alright) and tried to burn to CD (both in Windows and Linux) but in both cases it could not write says 'Wrong ISO image' by Brasero and Gnome CD/DVD burner, whereas in Windows, it gets aborted. In both cases the CDs were left unusable.

I downloaded v1.233 cdrom image, it works fine, but I cannot use that version because I want to save the configuration files in USB stick.

Any help appreciated!