you bought cheap player with buggy firmware, that's a problem. I don't think you can overcome those problems, as I assume there is no further support for your player regarding firmware updates. You may experiment with RK27 SDK. I don't know if your player is RK27 or RK28 but some people claimed the firmware has the same structure in both types. Another clue for supporting that hypothesis is that they both have ARM processor (RK27 has ARM7, and RK28 has ARM9?) and therefore ARM7 instructions should work on ARM9.
As you can see it's very complicated, so I can't tell you anything optimistic.
You may also give a shot with different firmwares. Try looking for player with similar keyboard, screen and such (only if you can restore your original firmware).
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