Memorex DVD MAXX 1648 - Which Lite-On clone is it?

I believe from old threads here that the Memorex DVD MAXX 1648 DVD ROM is a Lite-on drive.

Can anyone confirm this, and where I might be able to find some patched firmware to improve my ripping speeds. It seems terribly slow at approx 2x ripping (presumably due to RIPlock on CSS streams?)

Thanks in advance for any advice.

Pete