not sure what to tell you because the international asus.com web site in service dept. does not recognize that number as valid for your laptop model. I am not trying to be a pain, but if ASUS doesn't have anything on the laptop then there are no official BIOS files to acquire to update your laptop with. ref :
https
/www.asus.com/search/results.aspx?SearchKey=G70S-A1&SearchType=FAQ&IsSupport=True&TopicFilter=&CateFilter=&Sort=2
what country are you in ?
NB: this laptop was built in 2008, finding support files for it will be troublesome
found a manual for it, but without a new Bios file its pointless
https

/www.manualslib.com/manual/445165/Asus-G70sg-A1.html#product-G70S-A1