DW800A's new firmwares, B4N7, B5N7?

At Taiwan’s BenQ Download page,

They announced two new firmwares for DW800A.

B4N7 is only capable of writing DVD+R/RW discs,

while B5N7 can both write DVD+R/RW and DVD-R/RW discs, i.e., it is a dual-format firmware.

Also refer to Unofficial BenQ DVD ReWriter Firmware Page.