Getting OTP, we have to reencrypt NAND partition. I think that reason is O3DS NATIVE_FIRM.
I guess N3DS NATIVE_FIRM with N3DS system module and O3DS system titles could be possible.
I'm not sure but I believe that I can try it with other N3DS which is region changed.
Sorry for my bad english. :)
I found that Installing other-model system-titles is possible on 3dbrew.
(https://www.3dbrew.org/wiki/Titles#Installing_other-model_system-titles)
I think it means system titles of O3DS can be installed on N3DS and it can be a only way to downgrade Korean N3DS to...
It's not the movies or games downloads that I would worry about, like breaking into networks, downloading encrypted things, spying on network traffic. I have seen so many "Top Secret" seals on files when I was a kid
I was obsessed with finding UFOs, a surprising amount of US files where stashed on computers in other countries, China back in the early 90s omg sooo much