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Problem with debugging mode

Hi 

I was using Keil 5 to debug my code on #1 board, somehow the code was kind of stuck, it has no response to reset, and cannot run anywhere, the same code works with no issue on the other self-build board(these two are basically the same), this #1 board works also with no issue earlier today, this situation just suddenly happened. It has no problem with compile, download, enter debug mode.... I`ve drained my brain and cannot figure out what is wrong,,, any suggestions??

Thanks in advance.