Just bought an Emachines system which identifies the DVD writer as a Liteon
SOHW - 1633S BGS4. I downloaded the latest firmaware (DR16BSOS) from Liteon and when executed it says “No matched drive detected”. I have flashed 2 other Liteons 411s & 1693s - no problems.
The reason for the firmware update is because the Emachines drive does not recognize Liteons “BitType 135” utility.
Running WINXP SP2!!