Siemens info needed

Hi, I am wondering how many are Siemens mobile owner here, I am one but
since that Siemens mobile under BenQ is defunct so then anyone know
where can I get or download firmware for Siemens M65/Rescue Edition and
SXG75? My other question is that is it true that I can only use DCA-510
data cable to change the firmware of M6C(China M65 edition)to SW-50
Variant A 100 which is the international version? Please let me know.


Thanks
Choong