LG does support those OEM drives but only through OEM contacts because that's the way it should be. If LG makes firmwares for 4164B, LG will send them to OEMs like HP directly rather than posting on LG's web pages. I have never seen firmware updates for OEM models on LG's own websites. It's the same with Samsung, NEC, Pioneer, Lite-On, and many others. Lite-On, as another example, makes firmwares for HP and 4KUS, but those firmwares are posted on HP and 4KUS websites, not on Lite-On IT's websites. Piodata and Mad Dog firmware are also not supported for Pioneer and NEC, respectively, consumers. Especially when the OEMs request for specific fixes or something, makers will try to provide updates. So those OEM model consumers should first contact the people that sold to them (like HP and Dell.) When I imported NEC DVD writers (from NEC Japan), there was only one condition: NEC itself has nothing to do with product support. It was I that had to replace broken drives and it was also I that helped the users to use the drives well (thousands of free media and free drives, helping firmware hacking, etc.)
If one bought an OEM LG drive from a reseller, not from HP or Dell or such PC maker, no luck but to do everything on one's own because no one else is responsible for the support of such drives.
CDFreaks.com also has contact points for LG drives, but that does not include OEM models. The products LG itself support for consumers are GSA-4163B, GSA-5163D, GSA-4160D, GSA-5160D, and so on. (Though all models earlier than 4163/5163 were discontinued long ago.)