none of what you ask can be done, it was never implemented in any firmware for any of these player
these players were originally onda and then copied with varying degrees of reliability
no one (not even onda since NOV last year) have released updates for this player, unbranded and other copies never got updates anyway
china do not do album art as a rule and have only just started implementing it in some newer players
your player is, i am afraid, old and will never ... ever have album art nor changeable wallpapers, if you want those features we can point you to either cheap unbranded newer rockchip players (with easy skinning but no art) or branded chinese player with skinning, desktop back changing and album art) but they are better quality, newer chips and supported
so in brief ,,,,, never gonna happen ... ever .. sorry
reason wh company cant send firmware ... because they know squat and are only resellers and dont care about after are at all and they will not have access to any firmware at all, bet they dont even know what it is .. and thats not uncommon
cheers
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