You need special LG specific bridgeboard firmware for your external casing. Did you actually follow the links in the one I posted above? One of them brings you to this post which shows you where to download LG special bridgeboard firmware :
Do not worry that you are using controller card firmware for the 5160D (an older model of writer). A bit of explanation is in order :
LG has had external models of writers which are usually just an internal model in an external case. For example, the E10N is essentially a H10N in an external casing. Up until the 4163B(internal)/5163D(external) drives, the external case used had a prolific 3507 chipset inside. Nobody is quite sure what chipset they use now for recent models. Anyway, people ran into the same problem you have here when they used the same internal models in a prolific chipset external casing - the inability to burn audio CDs. They were mystified as to why this should happen since the external version of LG’s writers used a prolific chipset. Eventually, someone figured out that LG was using some special firmware for their prolific chipset enclosures. Since LG makes this particular firmware available for download, someone used it on their prolific chipset enclosures, and sure enough, it fixed the problem.
This will work but will leave you with another problem : you can’t burn faster than 12x with the drive in that enclosure. But there is a fix to this as well : go download firmware version JJ11 for the H10N from http://tdb.rpc1.org. Flash your H10N with that (you probably need to connect the drive to an internal IDE connector on a PC to flash the drive - flashing in an external casing will most likely not work) firmware and you should be able to burn at 16x again.
Do note that flashing with JJ11 (because it’s third party firmware) will invalidate the warranty of the drive but it’s the only way to get around the 16x burning problem. However, you can always flash back to JL11 (LG firmware) if you need to send the drive for servicing.
Sorry, I wasn’t able to explain this in detail at the time I originally replied to your post above. My new job does not leave me as much time as I used to have to be in this forum.