Hello Folks!
I have Formuler F1 model DVB and I have update to my receiver "openpli-4.0-beta-formuler1-20170511_usb.zip" latest version of software.
After update I couldn't use subtitle menu or Subtitle option while media player video playing.
Actually this problem started 3or 4 version before.
There is no any subtitle selection in audio or subtitle menu.
Of course subtitle same name with movie and inside of movie directory etc.
I tried many different movies but doest work.
And also media player/dna browser does not see some movie which in my hdd.
Please check your own device and after write to me answer. Please dont write classic answers. 
I think there is some bugs latest version.
anybody help to me? Thanks in advance.
