Hi Bhavin, Every time I have experienced this error, It is usually either a hardware issue( jumper disconnected etc.), or an issue with the debugger failing. If you are sure that all connections are correct and the problem persists, try restarting your computer. I don't know what causes it but sometimes I have this issue and for some reason I can see the FET in device manager, but can not flash or debug until restarting my computer.
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