ESP8266 Community Forum

Hello

I am unable to connect to flash. Waiting for MAC... I tried to connect D3 to GND (manually with cable).
Do I need to solder the cable ? How do I know the Wemos is dead `? It is blinking blue when the Nodemcu tries to flash. The port is connected

Thanks for any help!

you shouldn't need to use any wires for flashing, all should be automatic from within arduino ide.
To see more detailed error messages, go to file/preferences and select both checkboxes for "Show verbose output during".
If you want to check on general state of esp: open serial monitor, set to 74880 baud and push reset button, you should see boot message of esp8266.

Thank you for your help first of all!

This is the log from the serial monitor

17:43:44.848 ->
17:43:44.848 -> ets Jan 8 2013,rst cause:2, boot mode:(3,7)
17:43:44.848 ->
17:43:44.848 -> ets_main.c

and this is when connecting

C:\Users\RS\AppData\Local\Arduino15\packages\esp8266\tools\python3\3.7.2-post1/python3 C:\Users\RS\AppData\Local\Arduino15\packages\esp8266\hardware\esp8266\2.7.4/tools/upload.py --chip esp8266 --port COM7 --baud 921600 --before default_reset --after hard_reset write_flash 0x0 C:\Users\RS\AppData\Local\Temp\arduino_build_662067/sketch_apr17b.ino.bin
esptool.py v2.8
Serial port COM7
Connecting........_____....._____....._____....._____....._____....._____....._____
Traceback (most recent call last):
File "C:\Users\RS\AppData\Local\Arduino15\packages\esp8266\hardware\esp8266\2.7.4/tools/upload.py", line 65, in <module>
esptool.main(cmdline)
File "C:/Users/RS/AppData/Local/Arduino15/packages/esp8266/hardware/esp8266/2.7.4/tools/esptool\esptool.py", line 2890, in main
esp.connect(args.before)
File "C:/Users/RS/AppData/Local/Arduino15/packages/esp8266/hardware/esp8266/2.7.4/tools/esptool\esptool.py", line 483, in connect
raise FatalError('Failed to connect to %s: %s' % (self.CHIP_NAME, last_error))
esptool.FatalError: Failed to connect to ESP8266: Timed out waiting for packet header
esptool.FatalError: Failed to connect to ESP8266: Timed out waiting for packet header

hmm the connection is ok, you get output from bootloader but still connect from esptool fails.
The only thing left to try: set lower baudrate for flashing, something "standard" like 115200 or 230400