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DLPC4420AEVM: dlpc4420aevm,After reprogramming, the DLPC4420 cannot connect via USB and fails to start?

Part Number: DLPC4420AEVM
Other Parts Discussed in Thread: DLPC4420

Tool/software:

HELLO

Recently,I faced an issue,The baord of  dlpc4420aevm+.78DMD,After reprogramming, the DLPC4420 cannot connect via USB and fails to start.What the problem of this?

How to slove it?

thanks