Typically, you would want to install the newest X2 xecuter bios, which was X2 5035. This bios supports "no dvd drive" a little better than M8. As far as compatibility, if by "White DuoX 2" you mean you have a DuoX 2 GS, then yes, it will work. There are 2 versions of the bios, make sure you flash the one for version 1.6 consoles. It is named x2_5035_v16plus_512k.bin. One more thing, Make 100% sure you have a 1.6 before you flash cuz this bios only works for the version 1.6 and I have actually seen people get their version wrong.