I have tried to connect my custom target board with ST-link/V2 ISOL.
when I run STM32 ST-Link Utility, it looks OK, setting is captured as follows
after connect 20 pin JTAG cable to my custom board, STM32F103RF with empty flash.(I haven't flash it yet)
few seconds later, setting is changed as follows,
after error, I have to disconnect and reconnect USB cable connected to PC, and re-run ST-link utility.
Would you please let me know what is wrong with my setting or connection ?
FYI, ST-link/V2 is updated with latest firmware.
Thanks in advance.