Failed to connect to ESP32 ROM

General
#1

Hello! I’m trying to flash esp32 but i have some problem:
Loaded led/esp32 version 1.0 (20220331-073529)
Opening COM15 @ 115200…
Connecting to ESP32 ROM, attempt 1 of 10…
Connecting to ESP32 ROM, attempt 2 of 10…
Connecting to ESP32 ROM, attempt 3 of 10…
Connecting to ESP32 ROM, attempt 4 of 10…
Connecting to ESP32 ROM, attempt 5 of 10…
Connecting to ESP32 ROM, attempt 6 of 10…
Connecting to ESP32 ROM, attempt 7 of 10…
Connecting to ESP32 ROM, attempt 8 of 10…
Connecting to ESP32 ROM, attempt 9 of 10…
Connecting to ESP32 ROM, attempt 10 of 10…
Error: /src/cli/flash/esp/rom_client/rom_client.go:172: failed to connect to ESP32 ROM
/src/cli/flash/esp/rom_client/rom_client.go:124: failed to connect to ROM
/src/cli/flash/esp/rom_client/rom_client.go:110: failed to create ROM client
/src/cli/flash/esp/flasher/common.go:59: Failed to talk to bootloader.
See Home · espressif/esptool Wiki · GitHub
for wiring instructions or pull GPIO0 low and reset.
/src/cli/flash/esp/flasher/flash.go:80:
/src/cli/flash.go:231:
/src/cli/main.go:194: flash failed
What should i check?
Thanks

#2

I assume this is on windows from the mos gui?
Are you just clicking the flash button?

Do you know if your device is operational in any way?

  • Are you able to see any serial comms coming from the device when powered up?
  • Have you attempted to flash from another tool like Arduino?
#3

it was working couple hours ago, then we connect a LED and restart the device and we have this mistake.

no, i have not

#4

something strange with COM port, i try to connect to serial port via Putty, but “Unable to open connection to COM15. Unable to open serial port”

#5

Check if there are several instances of mos running and kill all of them.