Gt2560 v3 uploading error skt500v2

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hi friends , i tried everything nearly 3 week . i cant upload firmwire to my a10m . i did before but now i dont know whats happened. usb com is ok , motherboard correct selected in ardunio app . i get always skt500v2 timeout error .big blocks on my screen and i cant use printer :(

What software is that?
Also it says it cannot open COM3. Has the A10M connected to your PC as COM3 or as another COM port?
Extra info here on the GT2560 v3 if you need it: https://www.thingiverse.com/thing:3596842

GT2560 V3.0 resources - Geeetech A10 A10M