LG 32LH40 Firmware Update. Has anybody found one? Or at least a way to update the codecs so that MKV files can be played via USB

You may follow this method to solve "Roku doesn't play MKV" issues at
Roku MKV Easy Solve Can Play MKV on Roku 3 2 via USB Interface

Currenly Sony TV and Palystation only supports videos in MPEG-1, MPEG-2, MP4, WMV, ASF, DivX HD.
In order to play MKV on Sony TV, we had better convert MKV to Sony TV compatible format.

Usuallys Samsung PN50A650 does play MKV files via USB drive.
However, MKV is a container video format which may contain video or audio codec which are not supported by Samsung. Therefore, sometimes we still cannot play MKV on Samsung PN50A650.

To solve this can't play MKV on Samsung issue, you may follow this article at http://www.idealshare.net/video-converter/samsung-tv-mkv.html


Samsung TV Wont Play MKV Solution Convert MKV to Samsung TV

I have same issue here 37lh50yr . need to update firmware

Yes, get a UBS drive. or wireless adapter.

Your USB device needs to be Fat16 or Fat32 but as for reading mkv files I have the same issue. Not to mention it playing divx files in a choppy fashion.

go to LG .com or just google what your looking for it will be a dowloadable file you put on a flash drive and insert in tv's usb port

The player does not support .MKV files if you update the player it will still not play .MKV files the update is just to fix problems with the player.