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CCS/UCD3138: UCD3138: No devices found No ROM detected

Part Number: UCD3138

Tool/software: Code Composer Studio

Hello, I was recently learning the UCD3138HSFBEVM_029 demo board . 

I met a serious problem about download code into the demo board. 

Oneday, I downloaded a programm which did not clear the interrupt flag bit, after that I tried to connect ADC_EXT/SYNC and TMS to Ground, but there is still no change. Meanwhile, I download codes through "UCD3xxx Device GUI" ,  there is "no ROM detected"  and   "No devices found".  And the firmware download interface also reported errors.  So I expect to know how can I solve these problems?

Looking forward to your reply,  thank you very much!