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TM4C129CNCPDT: Unable to access the DAP after programmed with XDS110 debug prober

Part Number: TM4C129CNCPDT

Hi, 

I run into a problem after programming the MCU TM4C129CNCPDT for the first time. The first programming is successful, but I keep getting the 'unable to access the DAP' error afterwards when I tried to reprogram it. I suspect there may be errors in the code keep resetting the device and prohibiting any access externally. I tried the methodS found on the forum:

1. short OCSIN and OCSOUT;

e2e.ti.com/.../ccs-launchxl2-570lc43-error-1170-0x0---unable-to-access-the-dap

2. keep pushing the reset button and retrying "connect to target" from CCS. 

e2e.ti.com/.../launchxl2-tms57012-error-connecting-to-the-target-error--1170-0x0-unable-to-access-the-dap

But I still cannot connect to the target after 100s times trying.

Please let me know if there is other way to recover the MCU and make it reprogrammable.

Thanks,