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uVision can't download but ST-link utility can donwload exectuion file

Question asked by Calvin63 on May 11, 2015
Latest reply on Jun 19, 2015 by Clive One
Dear sir:
 I use STM32F407 discovery board's ST-link feature to communicate with my custom STM32F427 board. I can download (and reset/run) the execution file created by uVision 5.0.5 via ST-link utility tool. However uVision can't download directly and always said "unknown target connected". What should I check or any place to set to make uVision recognize the target?