Error: Activating device: KO. Please, verify the boot mode configuration and check the serial port configuration. Reset your device then try again...

[yying.1]

I am using stm32f103c8t6 with uart cable to connect it with stm32 cube programmer but come up the statement above. Any suggestion to fix this problem?

14:12:16 : Serial Port COM3 is successfully opened.

 14:12:16 : Port configuration: parity = even, baudrate = 115200, data-bit = 8,           stop-bit = 1.0, flow-control = off

 14:12:18 : Timeout error occured while waiting for acknowledgement.

 14:12:18 : Timeout error occured while waiting for acknowledgement.

 14:12:18 : Error: Activating device: KO. Please, verify the boot mode configuration and check the serial port configuration. Reset your device then try again... 

I did press reset button and placed my BOOT0 to 1 so i really have no idea to fix this problem.

[r-mageddon]

Hello, i hope you found the solution to your problem. if not, try connecting the jumper connection of the 'boot-0' pin to the other side to put it in boot mode and upload your program. hope this helps

[MQi.1]

I met the same error prompt on STM32WB09KE(MB2032+MB1801D), when I try to UART programming through an actual ST-Link V3SET(as it was told here ). I tried this since I met this , my connection between V3Set and MB2032(WB09KE), pin map refer - page 27 of UM3345:

VCC      3.3V 
CLK      11 - CN3
GND     GND
DIO      9 - CN3
NRST   14 - CN3

and, in Prog, I got these(the second photo was tried back by Jumper user flash):