title: esptool.FatalError: Timed out waiting for packet header Arduino
body: <p>I have a ESP8266. The last working state was loading just fine and wasn't getting any errors on esptool. However, after coming back to the code and running the Arduino. To give some background, I am creating a nixie clock with ESP8266.</p>
  
  <pre><code>esptool.FatalError: Timed out waiting for packet header
  </code></pre>
  
  <p>It's currently on baud: 57600
  I will add the full error below:</p>
  
  <pre><code>    esptool.py v2.6
  2.6
  esptool.py v2.6
  Serial port /dev/cu.wchusbserial14130
  Connecting........_
  Chip is ESP8266EX
  Features: WiFi
  MAC: dc:4f:22:11:68:e3
  Uploading stub...
  Running stub...
  Stub running...
  Configuring flash size...
  Auto-detected Flash size: 4MB
  Compressed 347296 bytes to 246702...
  
  Writing at 0x00000000... (6 %)
  Writing at 0x00004000... (12 %)
  Writing at 0x00008000... (18 %)
  Writing at 0x0000c000... (25 %)
  Writing at 0x00010000... (31 %)
  Writing at 0x00014000... (37 %)
  Writing at 0x00018000... (43 %)
  Writing at 0x0001c000... (50 %)
  Writing at 0x00020000... (56 %)
  Writing at 0x00024000... (62 %)
  Writing at 0x00028000... (68 %)
  Writing at 0x0002c000... (75 %)
  Writing at 0x00030000... (81 %)
  Writing at 0x00034000... (87 %)
  Writing at 0x00038000... (93 %)Traceback (most recent call last):
    File "/Users/Dos/Library/Arduino15/packages/esp8266/hardware/esp8266/2.5.2/tools/upload.py", line 25, in &lt;module&gt;
      esptool.main(fakeargs)
    File "/Users/Dos/Library/Arduino15/packages/esp8266/hardware/esp8266/2.5.2/tools/esptool/esptool.py", line 2698, in main
      operation_func(esp, args)
    File "/Users/Dos/Library/Arduino15/packages/esp8266/hardware/esp8266/2.5.2/tools/esptool/esptool.py", line 2158, in write_flash
      esp.flash_defl_block(block, seq, timeout=DEFAULT_TIMEOUT * ratio * 2)
    File "/Users/Dos/Library/Arduino15/packages/esp8266/hardware/esp8266/2.5.2/tools/esptool/esptool.py", line 104, in inner
      return func(*args, **kwargs)
    File "/Users/Dos/Library/Arduino15/packages/esp8266/hardware/esp8266/2.5.2/tools/esptool/esptool.py", line 632, in flash_defl_block
      self.ESP_FLASH_DEFL_DATA, struct.pack('&lt;IIII', len(data), seq, 0, 0) + data, self.checksum(data), timeout=timeout)
    File "/Users/Dos/Library/Arduino15/packages/esp8266/hardware/esp8266/2.5.2/tools/esptool/esptool.py", line 354, in check_command
      val, data = self.command(op, data, chk, timeout=timeout)
    File "/Users/Dos/Library/Arduino15/packages/esp8266/hardware/esp8266/2.5.2/tools/esptool/esptool.py", line 332, in command
      p = self.read()
    File "/Users/Dos/Library/Arduino15/packages/esp8266/hardware/esp8266/2.5.2/tools/esptool/esptool.py", line 277, in read
      return next(self._slip_reader)
    File "/Users/Dos/Library/Arduino15/packages/esp8266/hardware/esp8266/2.5.2/tools/esptool/esptool.py", line 1877, in slip_reader
      raise FatalError("Timed out waiting for packet %s" % waiting_for)
  esptool.FatalError: Timed out waiting for packet header
  esptool.FatalError: Timed out waiting for packet header
  </code></pre>
  
  <p>Hopefully someone can help out or give me some knowledge as to why this has occurred. Thanks in advance!</p>