The memory card should be formatted, exclusively in FAT32, at first I used a memory card in exFAT, which worked without comments in the smartphone, here I hung up the player on some tracks.
Russian tags are not supported. Encoding does not matter. Of those that I have tried, do not read any.
Russified firmware 1.0 can be found here:
https://yadi.sk/d/fjatxE6TgN9ZqThe player is very demanding to the content, especially to its source material, if the source material is not of high quality, then it is better not to listen to it. For every amn, there is a Cowon with his BBE whistles, or Sony, these I’ll draw out anyway, but the whole authenticity of the melody is lost.