Just any product or a player? Or maybe exactly an Ingenic Z4760 CPU player from Fiio?
А player / a DAC / a headphone amplifier they are all different class devices.
Some of them don't trouble you since they don't need a firmware.
Sure, a player is the most complex and unprotected device if is not supported with recovery means.
Again, I like the Fiio's ideas about X3 and perhaps will purchase and try it.
And again what I'm afraid if this model is bricked I see I have no way to recover it.
That's a sad story when Chinese offer us another cat in a sack ....
Recommended reading for the above poster.
Author: Dale Carnegie
Read and return.