u didn't give me very clear symptom. white screen?black screen? hang display? unrecognize USB? no respone at all?
anyway, ur player is compatible with firmware9.0.48 or 9.0.50 with upgrade tool version 4.00~4.25
u have to try 1 by 1 to get correct firmware that match 1.ATJ2091. 2.PCB model. 3.LCD model
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