X-Micro Tech. EVA 310 - Manual (Page 27)

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Can’t play the
private compressed
MP3 files. The MP3 files currently are
compressed with different
compress rate and format,
while this Player supports
standard compressed MP3
only, please do not adopts
layer one or two
compression. Download the standard MP3 files again.
No response after
pressing button. HOLD switch is on, buttons
are locked. Push the HOLD switch to the opposite direction.
Can’t open the disk
or prompt I/O error
after connecting
PC. Caused by some improper
operation. Press and hold the V+ button, and then connect
USB cable, when there is a circle appears in the
first box, then press firmware feature to format ,the
upgrade will be ok until the circle change to be a
tick.