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These are some common problems initailly.Restart ur PC and try again check all connections ingore warning.But you can try it surely.There are more threads on it.Read it there.
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Thank you very much for your reply！！!
But when this error occurred, I had to try to restart all the project, recompile the Simulink and Quartus Project, or use another PC. All the methods were failed. I have tried more than one week.
Strangely, the day before yesterday it suddenly becomed successful. The JTAG could download successfully, althought I changed nothing and used the same methods before.:confused:
Why? Maybe it will can't download later. How should I solve the problem? I think the problem has taked much time.
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