KC686-A6 error on upload

[sm4l]

you can try to download KCS firmware again. or you can download firmware by ESPHome yaml file.
Do you problem is can't turn on 3 relays at the same time? can you take a video of your problem, send to WhatsApp number: +86-15381188302

after several attemps the firmware stoped working.
i think the ESP is broken ...


Firmware Upload Failure

• Tools Used: PlatformIO / esptool / Arduino IDE
  
• Error Message:
  
  Code:

  A fatal error occurred: MD5 of file does not match data in flash!
• This indicates the upload process finishes, but the board fails validation after flashing.
  

2. ESP32 Not Responding Post Upload
[*]Upload process starts but either:
Fails at checksum.
Uploads successfully only esptool via cli.

Code:

rst:0x10 (RTCWDT_RTC_RESET),boot:0x17 (SPI_FAST_FLASH_BOOT)
configsip: 0, SPIWP:0xee
clk_drv:0x00,q_drv:0x00,d_drv:0x00,cs0_drv:0x00,hd_drv:0x00,wp_drv:0x00
mode:DIO, clock div:2
load:0x3fff0030,len:6656
load:0x40070000,len:15052
load:0x40080400,len:3836
csum err:0xfe!=0xf8
ets_main.c 384
---- Closed the serial port COM6 ----