Emachines - Liteon 1633S Firmware flash?

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!!

Any ideas??


  1. if you have nvidia ide-drivers installed on your system, uninstall them.
  2. download firmware CS0P and flash it: http://codeguys.rpc1.org/firmwares.html#SOHW-1653S

make sure u get the crossflasshed flash firmware tho, so u dont have any problems

Does this firware allow you to burn DVDs at 16x?
I used the Memorex DVD-R 16x single layer and it burned at 8x. An improvement of not being able to burn at any speed.

I have the Gateway installed burner Lite-On SOHW 1633s BGS4.
I flashed it with the CSOR.
Can I reflash it if there is a better firmware that will burn at 16x? Or am I just limited to the 8x burn.

Im just happy I can use the 2 spindles I bought on sale for $8 for 25 DVDs


the dvd max speeds are 16x for +r and 12x for -r with any 1653s firmware.
this drive can’t do -r @16x.