How to flash Espruino esp8266 ============================= *** Flash Tool Windows, Linux and MacOSX: esptool.py - serial flash tool https://github.com/themadinventor/esptool Linux and MacOSX: wififlash.sh - script to update flash espruino via wifi for 4MB esp8266 (e.g. esp-12) ./scripts/wiflash :88 espruino_esp8266_user1.bin espruino_esp8266_user2.bin *** Erase flash before updating to a new version esptool.py --port [/dev/ttyUSB0|COM1] --baud 115200 erase_flash espruino__esp8266 -------------------------- *** To flash a 512KB esp8266 (e.g. esp-01) using the serial port use: esptool.py --port [/dev/ttyUSB0|COM1] --baud 115200 write_flash \ --flash_freq 40m --flash_mode qio --flash_size 4m \ 0x0000 "boot_v1.6.bin" 0x1000 espruino_esp8266_user1.bin \ 0x7C000 esp_init_data_default.bin 0x7E000 blank.bin For 1MB flash use 0xFC000/0xFE000 and for 2MB flash use 0x1FC000/0x1FE000 on the last line. *** To flash a 4MB esp8266 (e.g. esp-12) using the serial port use: esptool.py --port [/dev/ttyUSB0|COM1] --baud 115200 write_flash \ --flash_freq 80m --flash_mode qio --flash_size 32m \ 0x0000 "boot_v1.6.bin" 0x1000 espruino_esp8266_user1.bin \ 0x3FC000 esp_init_data_default.bin 0x3FE000 blank.bin espruino__esp8266_4MB ------------------------------ *** To flash a 4MB eps866 with Flash map 4MB:1024/1024 (BOARD=ESP8266_4MB) esptool.py --port [/dev/ttyUSB0|COM1] --baud 460800 write_flash \ --flash_freq 80m --flash_mode qio --flash_size 4MB-c1 \ 0x0000 "boot_v1.6.bin" 0x1000 espruino_esp8266_user1.bin \ 0x3FC000 esp_init_data_default.bin 0x3FE000 blank.bin Special hints for a broken device after flashing ------------------------------------------------ newer ESP01 like ESP01s have 1MB flash size try different --flash_mode values like dio or dout try to use a combined file to flash like espruino_..._combined_512.bin or espruino_..._combined_4096.bin