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):

[Rajitha_at_UoM]

Problem Solved...!:white_heavy_check_mark:

Problem:

Things I used: FTDI programmer + Blue Pill(F103C8T6) + Cube Programmer + Cube IDE for generate .hex file.

Steps to avoid that issue:
1. Open the cube programmer.

2. Configure Settings.

3. BOOT0 =1

4. Remove the USB . 

5. Connect again the USB cable while pressing the reset button in the blue pill. remove finger from the button 5s after connecting USB.

6. Check the COM port and CONNECT.

7. You can use below you tube video to steps after this ... https://youtu.be/zUsollWLnV4

My English isn't good , sorry for it.

[Techn]

This is serial bootloader method. You have to press reset and bootloader at the same time and release reset. Do not connect any other devices to any other port. You can connect any USB to uart converter. Rest is as described above..