Just to help clear that up, and add a lil more info:
For any of the LiteOn drives (OEM, rebadged, or official), you shouldn’t have to crossflash.
For the Samsung drives, no crossflashing.
For the LG drives, since I didn’t list it out, you have to do crossflashing. Models where older builds support crossflashing:
[li]All BH16, WH16, BH14, WH14 ending with “NS40” made before a certain date (made before 2015). There are new variants which end with NS50 or NS55 which do not support crossflashing. There are also new variants of the NS40 models which are actually NS50 models, just with the older model name…And because they are NS50 hardware, the firmware for crossflashing won’t work.
[/li][li]BE14NU40: external drive likely to be based on NS40 hardware, with support for crossflashing to the necessary firmware. Seems to have been replaced with a BE16NU50, which…You can imagine that it’s the unsupported NS50 hardware.
[/li][li]BH16NS48 exists, and is likely guaranteed to support crossflashing (only one generation of hardware used this model name).
[/li][li]WH16NS48 exists, as a special variant which supports scanning. It is from this drive that people got the firmware for crossflashing. It is hard to find, and is sold as either WH16NS48DQ or WH16NS48DUP.
[/li][li]Asus BW-16D1HT, BW-14D1XT, and LG-based BW-12B1ST… The 16x model can be either NS40 or NS50 hardware (hence no guarantee for crossflashing). 14x and 12x models are almost guaranteed to be the older NS40 hardware with support for crossflashing.
Unless explicitly mentioned, the models above are generally INTERNAL drives. External variants exist for many, not all.
For the LiteOn drives, model numbers shift as follows, if an external version is available.
LiteOn: change “iHBS” to “eHBU”.
Plextor: PX-LB950UE or PX-B950UE.
HP: “i” changes to “e”.
Teac: no known external variant.
Sony & Optiarc: no known external variant.
Memorex: ends with “LU” rather than “L”.
ASUS: BW-12D1S-U (may not be a LiteOn model, but the only other option is a LG. I assume. I don’t think they rebadged a Pioneer model for an external drive.)
…You know the Samsung external models, and the LG external models. That should cover it.