the chipset is
Ankya
there are several firmwares on tis site for Ankya players but again as yours may be a no-brand player there is no real way to find which one is for your player
you may be best doing a search for Ankya to see peoples experiences of how to update these chipsets
as far as i know the player you have is not that good and many have bitten the dust for no reason other than being cheaply put together
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