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Casio PX-135 help needed


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I have a 10 years old Casio PX-135. I have some issues with distorted sound coming from build in speakers and headphones. In debug/diagnostic mode the sound seems to be ok. 

I think I need to re-flash the ROM with the original sounds. Where can I find rom files and a flashing utility for my piano? I don’t have anymore the original CD. 



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Do you know if I buy a ‘MDA1 PCB ASSY/MAIN’, it will come flashed with the right FW?

Can I ask on this forum for a link where I can buy such part? 
Also I see that px130 and px135 have same build. Anyone knows if there is any difference between the main boards?

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