Of course
adicoto meant 348 (not 384).
Also he's referring to PC-version of BS.Player.
However, if you're referring to Andoid version of BSPlayer, I'm afraid there simply is no separate ISO639 code for Brazilian Portuguese, nor is it to be found in the list of selectable languages.
That being said you could perhaps try "pob/pb" as language-indicator.
I think (but don't know) it is used by Opensubtitles.org, i.e. one of the subtitle providers used by BS.Player. Further Getsubtitle.com =
Subtitles.com.br are also used by BS.Player and I know for sure they have Brazilian Portuguese subs. I think (but don't know) they might use "bra".
(In Android-BSPlayer: tap on menu ... Preferences ... Subtitles ... Online subtitles ... Online subtitles languages ... then type in
pob/pb,bra and tap [OK])
(Let us know if it works.)
Maybe
Ico-man (BS.Player team member) can shed some light on this; I'll ask.