![]() On the Mega/8266 board, switch OFF DIP switches 1-4 and 8. They have subsequently been upgraded to V3.9.0 which no longer has the facility for the user to set the flash memory size consequently, the device memory size is set to an inappropriate default and the software will not run! You can still download to the flash using the esptool.py command-line tool, which is described at the end of these instructions. NOTE: These instructions were written using the V3.8.5 version of the Flash Download Tools. There is nothing to install as such, the download tool runs directly from the folder. Download this and unzip it to another folder. ![]() Then go to and locate the Flash Download Tools (ESP8266 & ESP32 & ESP32-S2). Locate the firmware you want - I used the ESP8266 NonOS AT Bin V1.7.4, click the download button, and unzip the files to a suitable folder. First, go to the Espressif web site and download the firmware and the Download Tool. ![]()
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June 2023
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