错误 未检测到 ST-LINK。STM32F103C8

我买了一个新的STM32F103C8。我开始闪烁，我看到它不是由 J-Link 定义的：

J-Link connection not established yet but required for command.
Connecting to J-Link via USB...FAILED: Failed to open DLL

我决定把ST-Link升级到J-Link，好像正常闪烁

Preparing for FW update (can take up to 10 seconds)...O.K.
Identifying ST-LINK variant...O.K.: ST-LINK/V2
Performing firmware update...O.K.

但 J-Link 也没有看到。

我去 ST-Link Utility 并得到以下信息：

00:41:07 : No ST-LINK detected
00:41:39 : Can not connect to target!
                  Please select "Connect Under Reset" mode from Target->Settings menu and try again.
                  If you're trying to connect to a low frequency application , please select a lower SWD Frequency mode from Target->Settings menu.
00:41:41 : STLink USB communication error

在这种情况下，设备管理器决定一切

在那之前，我根本没有碰过MK。告诉我可能是什么问题。