The 4163B is something of a legend. The burn quality was really good for quite a few types of media. Burn speeds for 16x discs were around 5:16-5:30. These are times which are still very decent now.
The later models in that line did not have very much extra to offer in terms of features. The 4167B, while a decent drive in its own right, screws up royally with 4x TY media (either + or -, I can't remember which). The H10N did offer 12x DVD-RAM burning, but since the discs are not available outside Japan, that feature is pretty much vapourware.
In any case, as pointed out above, you cannot flash the 4163B with other firmware The later LG writers used different chipsets so flashing with the firmware for these drives (if it were possible at all) would kill your drive.
Best to leave it alone.