esptool.FatalError: Failed to connect to ESP8266: Timed out waiting for packet header

[ChazTuna]

This happens with Version 2.6.0 but not Version 2.5.2

Device: Adafruit HUZZAH ESP8266
IDE: Arduino 1.8.9 Windows 10
BAUD: 115200

Just changing back to Version 2.5.2 and recompiling and doing the upload works fine, but not Version 2.6.0

Stats on upload with Version 2.5.2:
esptool.py v2.6
2.6
esptool.py v2.6
Serial port COM3
Connecting....
Chip is ESP8266EX
Features: WiFi
MAC: *******************
Uploading stub...
Running stub...
Stub running...
Configuring flash size...
Auto-detected Flash size: 4MB
Compressed 335184 bytes to 236579...

Writing at 0x00000000... (6 %)
Writing at 0x00004000... (13 %)
etc.

[devyte]

Duplicate of #6755.
Closing.