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ARRIA II GX125 Dev Kit JTAG problem (UNKNOWN ID)

Honored Contributor II

Hi Sir, 

We are using a Arria II GX 125 dev board from ALTERA. it work well before. But now , it failed in JTAG download. In the Auto detect in programmer, a device named UNKNOWN_C0829037 will be detected. The screen shot is attached. Could anyone help me ? Thanks alot.
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