DVD-RW Firmware Problem



Hi,i’m new to this forum and i’m sorry if there is allready an open thread with the same problem but i can’t find it.
Maybe you can help me.The problem that i have is that my dvd rw wont read some dvd’s,like win7 instalation dvd.I know that i have to update my firmware,but the big problem is that i cant find the update.
I have Slimtype DVDRW SSM-8515S GRS6.I think is OEM,not sure.I downloaded GS09.exe but it doesnt work.From what i could find is that i need a hacked GS08 firmware and then i can update to GS09.I’ve searched for 3 days for an update and i can’t find it.Maybe is another solution for my problem.Can anybody help me?