>>105780161
My bad it's RBK5002 and there's absolutely nothing in there about this mysterious micro SD slot or what audio codecs it supports. I've tried WAV/AAC/WMA and they all fail except that one MP3 file. I''ve been trying older versions of LAME with no success, it's like this fucking chink firmware is looking for something in the ID3 tags.

https://device.report/manual/14618626