Plextor firmware

ok , the firmware for the PX-755 SA , 1.04 & 1.05 don`t work at all i have try them both and it freezes on me by the way am using nero 7 . i got in touch with plextor via e-mail and the result its no answer no xplanation what so ever . i allways have to go back to the 1.02. another thing is they never put out the 1.03 that right their could be the situation might be the hole ball of wax i dont know but if any body got any answer let me know please thank you.