JLink info:
------------
DLL: V6.30h, compiled Mar 16 2018 18:02:51
Firmware: J-Link V9 compiled Mar  2 2018 17:07:57
Hardware: V9.40
S/N : 59425868
Feature(s) : RDI, GDB, FlashDL, FlashBP, JFlash, RDDI

* JLink Info: STM32 (connect): Can not attach to CPU. Trying connect under reset.
* JLink Info: STM32 (connect): Can not attach to CPU. Trying connect under reset.
***JLink Error: STM32: Connecting to CPU via connect under reset failed.
Error: Flash Download failed  -  Target DLL has been cancelled
Flash Load finished at 15:23:01

此帖出自小平头技术问答