Wd tv mini media player firmware

is it possible to update the firmware so mkv files can be played? 

Your post sounds more like an Idea or a Feature Request. The best place for this is in our Ideas Lab. This way someone from WD will be sure to see it. However, I would search first and make sure that there isn’t another idea similar to yours that you could add your post to and vote on.

Ideas Lab

The Ideas lab folder is a very good idea, but wait 6 months or more for a firmware update is not acceptable.

also, in come cases no more firmwares (WDTV 1st gen).

It should be nice to have, for each feedback, an aswer.