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STM32F030K6T6 can only be programed with ST-LINK once

Question asked by xu.jianchun on Feb 3, 2015
Latest reply on Feb 4, 2018 by Clive One
my design using STM32F030K6T6, see attached schematics, and using SWD to program, with ST-LINK(Version is at attached picture), I can only program STM32F030K6T6 one time, after code (which is simple toggle one LED on/off) is running, ST-LINK can never connect to STM32F030K6T6 again, what is the reason ?