KC868-A16 - the firmware fails to upload.

[luke19]

Good evening,
I am writing to report an issue with a KC868-A16 board: the firmware fails to upload.
I have strictly followed the procedure detailed in the following guide:https://www.kincony.com/esp32-kcsv2-firmware.html
An explanatory video detailing all the actions I perform is attached to this request.

Details of Troubleshooting Performed
- I have tested the procedure on three different PCs.
- I have tried using both USB 2.0 and USB 3.0 ports.
- The flashing program does not return any error, but the firmware is not uploaded.

Error Message Displayed
The only message that appears in the flashing tool is:

test offset : 0 0x0
case ok

Video of the problem:
https://youtu.be/6Pr5BCM6tB0

Request for Assistance
Could you please provide instructions on how to resolve this problem?

Thank you

[admin]

1: install usb driver: https://www.kincony.com/download/CH341SER.zip
2: if you have installed RF433MHz receiver module, please remove it when download firmware.
3: please select the COM3 from the option list, NOT input by yourself.