Flash ESP8266-12/12E

Steps to flash new firmware:

1. (optional) Backup flash

   esptool.py --port port-of-esp8266 --baud 115200 read_flash 0x000 4194304 fw_backup.bin

2. Erase flash

   esptool.py --port port-of-esp8266 --baud 115200 erase_flash

3. Write esp init data (see SDK Init Data)

   esptool.py --port port-of-esp8266 --baud 115200 write_flash 0x3fc000 esp_init_data_default.bin

4. Write firmware

   esptool.py --port port-of-esp8266 --baud 115200 write_flash 0x0000 fw.bin