I find trouble updating my firmware with esp8266 with following error message.
[espDownloader.py][line:351][ERROR]: Chip sync error: Failed to connect to ESP8266: Timed out waiting for packet header [2019-06-04 07:53:16,009][ESP8266Loader_spi][espDownloader.py][line:439][ERROR]: ESP8266 Chip sync error esp_sync_blocking.
I am unable to resolve even after a number of attempts. Please help me resolve my issue. Thank you in advance.