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If you build your firmware with the cloud builder or the Docker image, or any other method that produces a combined binary, then you can flash that file directly to address 0x00000. If you have an ESP-01 or other device without built-in USB, you will need to enable flashing yourself by pulling GPIO0 low or pressing a "flash" switch, while powering up or resetting the module. If you have a NodeMCU dev kit then you don't need to do anything, as the USB connection can pull GPIO0 low by asserting DTR and reset your board by asserting RTS. Conversely, for a normal boot, GPIO0 must be pulled high or floating. To enable ESP8266 firmware flashing GPIO0 pin must be pulled low before the device is reset.

dmg for macOSĭisclaimer: the availability of NodeMCU PyFlasher was announced on the NodeMCU Facebook page but it is not an official offering of the current NodeMCU firmware team. Supported platforms: anything that runs Python, runnable. Self-contained NodeMCU flasher with GUI based on esptool.py and wxPython. The easiest solution is to fully erase the chip before flashing:

In some uncommon cases, the SDK init data may be invalid and NodeMCU may fail to boot.

The firmware image file contains default settings dio for flash mode and 40m for flash frequency.

Since this documentation may not have been able to keep up refer to the esptool flash modes documentation for current options and parameters. It's advised you run the latest version (check with esptool.py version).

esptool.py is under heavy development.

some ESP-01 modules come with 512kB while others are equipped with 1MB.

See below if you don't know or are uncertain about the capacity of the flash chip on your device.

binįlash-mode is qio for most ESP8266 ESP-01/07 (512 kByte modules) and dio for most ESP32 and ESP8266 ESP-12 (>=4 MByte modules). Run the following command to flash an aggregated binary as is produced for example by the cloud build service or the Docker image.Įsptool.py -port write_flash -fm 0x00000. Supported platforms: OS X, Linux, Windows, anything that runs Python Tool overview ¶ esptool.py ¶Ī Python-based, open source, platform independent, utility to communicate with the ROM bootloader in Espressif ESP8266.

When switching between NodeMCU versions, see the notes about enduser setup / captive portal / WiFi manager.