GigaDevice Semiconductor GD-Link Adapter - Figure 4-2. JTAG;SWD Port Selection in Keil

GD-Link Adapter User Guide
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Figure 4-2. JTAG/SWD Port selection in Keil
Select “Utilities” page, and then select “CMSIS-DAP Debugger”, then click “Settings”
command button, “Add” the correct flash programming algorithm according to the GD32 MCU
which is using.