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A firmware Flash tool for nodemcu

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Error:Serial port connect failed, please check it. ![grafik](https://github.com/nodemcu/nodemcu-flasher/assets/16349349/7817ca48-0333-4b4e-8d9c-01977056ac5f)

I want to undue the firmware update I performed with this process back to original ewelink compatible firmware. The reason is that Smartthings no longer works with the revised firmware...

I can't update my GBS-C with ESP8266 but apparently my GBS-C is not recognised on my PC and also the serial COM port is not listed, I don't know why....

``` Command: esptool.py --port COM6 --baud 115200 --after no_reset write_flash --flash_mode dio 0x00000 C:\Users\pussycat\Downloads\AIThinker_ESP8266_8Mbit_v1.5.4.1.bin esptool.py v2.6 Serial port COM6 Connecting.... Detecting chip type... ESP8266 Chip is ESP8266EX Features: WiFi MAC:...