ESP8266 Community Forum

esptool.py v3.0
Serial port COM4
Connecting.....
Chip is ESP8266EX
Features: WiFi
Crystal is 26MHz
MAC: e8:db:84:e5:fe:b3
Uploading stub...
Traceback (most recent call last):
File "C:\Users\ilove\AppData\Local\Arduino15\packages\esp8266\hardware\esp8266\3.0.2/tools/upload.py", line 66, in <module>
esptool.main(cmdline)
File "C:/Users/ilove/AppData/Local/Arduino15/packages/esp8266/hardware/esp8266/3.0.2/tools/esptool\esptool.py", line 3575, in main
esp = esp.run_stub()
File "C:/Users/ilove/AppData/Local/Arduino15/packages/esp8266/hardware/esp8266/3.0.2/tools/esptool\esptool.py", line 722, in run_stub
self.mem_block(stub[field][from_offs:to_offs], seq)
File "C:/Users/ilove/AppData/Local/Arduino15/packages/esp8266/hardware/esp8266/3.0.2/tools/esptool\esptool.py", line 611, in mem_block
self.checksum(data))
File "C:/Users/ilove/AppData/Local/Arduino15/packages/esp8266/hardware/esp8266/3.0.2/tools/esptool\esptool.py", line 413, in check_command
val, data = self.command(op, data, chk, timeout=timeout)
File "C:/Users/ilove/AppData/Local/Arduino15/packages/esp8266/hardware/esp8266/3.0.2/tools/esptool\esptool.py", line 386, in command
p = self.read()
File "C:/Users/ilove/AppData/Local/Arduino15/packages/esp8266/hardware/esp8266/3.0.2/tools/esptool\esptool.py", line 331, in read
return next(self._slip_reader)
File "C:/Users/ilove/AppData/Local/Arduino15/packages/esp8266/hardware/esp8266/3.0.2/tools/esptool\esptool.py", line 2648, in slip_reader
raise FatalError('Invalid head of packet (0x%s)' % hexify(b))
esptool.FatalError: Invalid head of packet (0x84)
esptool.FatalError: Invalid head of packet (0x84)

Hello, have you properly done the driver installation and board installation process? Kindly check. Here is a link that may help you: https://github.com/esp8266/Arduino/issues/7125