http://forum.rpc1.org/dl_firmware.php?download_id=2053
BenQ DW1640 - BSGB, BSHB, BSIB, BSJB, BSKB, BSLB, BSMB, BSNB, BSOB, BSPB, BSQB, BSRB / (Bulk) GSHB

所以韌體是G字頭不是舊韌體,GSOB比GSHB晚出...也許吧...