there are 2 series of rockchip processors, the RK260X and the RK270X. If your mp4 can only support avi files encoded in divx than its a RK260X. dont try to update these players (i tried and now my touchscreen doesnt work). If it can support multiple video formats without conversion, its the newer RK270X. you will have better luck updating those. if you want more info than you will have to open the case. i hope this helps!
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