Some maby stupid questions about LiteOn ldw-451s

I hawe LiteOn LDW-451S with patched firmware of ldw-851s and also speedhacked firmware flashed in my 451s. Didi it works as ±8x DVD burner or ± 8x4x .
Could i flash patched firmware for SOHW-812S and would that work???
Please give me advice and your opineon???
P.S. Sorry on my bad English…

It will be a 8x +R, 4x -R burner.

Do not use the 812S firmware because 8x -R will NOT work.