Well, I did it
With the attachment of previous post, we can make that mediaplayer sends artist / album / song title to rds_ps , but fmtxd will limit to 8 static characters.

Well, replaces fmtxd and fmtx_client with the attachments files of this post (Are fmtx of PR 1.1.1).
And ¡¡¡ IMPORTANT !!! after replace files, restart phone. If you don't make this, the "new" fmtx won't work.

Once it's done, start mediaplayer->play song and start FM Transmitter
And you will see rds_ps dynamic text on your car, how before update PR1.2