Board d1_mini (platform esp8266, package esp8266) is unknown after upgrade to 2.4.0-rc2 · Issue #3775 · esp8266/Arduino · GitHub
![How to resolve “Board generic (platform esp8266, package esp8266) is unknown” error? — ESP8266 Arduino Core 3.1.2-7-g65579d29 documentation How to resolve “Board generic (platform esp8266, package esp8266) is unknown” error? — ESP8266 Arduino Core 3.1.2-7-g65579d29 documentation](https://arduino-esp8266.readthedocs.io/en/latest/_images/a04-contents-of-package-folder.png)
How to resolve “Board generic (platform esp8266, package esp8266) is unknown” error? — ESP8266 Arduino Core 3.1.2-7-g65579d29 documentation
Board generic (platform esp8266, package esp8266) is unknown · Issue #1514 · esp8266/Arduino · GitHub
Wemos D1 mini is an ESP8266 board that's interesting thanks to its size, its low price ($4), micro USB power, its shields, and
![How to Use Wemos ESP-Wroom-02 D1 Mini WiFi Module ESP8266 + 18650 by Using Blynk : 10 Steps - Instructables How to Use Wemos ESP-Wroom-02 D1 Mini WiFi Module ESP8266 + 18650 by Using Blynk : 10 Steps - Instructables](https://content.instructables.com/FBU/IUZ7/JR6OH3RN/FBUIUZ7JR6OH3RN.png?auto=webp&fit=bounds&frame=1&width=1024)
How to Use Wemos ESP-Wroom-02 D1 Mini WiFi Module ESP8266 + 18650 by Using Blynk : 10 Steps - Instructables
![$4 Wemos D1 mini ESP8266 Board Supports Shields with a Temperature Sensor, a Button, a Relay, or a micro SD slot - CNX Software $4 Wemos D1 mini ESP8266 Board Supports Shields with a Temperature Sensor, a Button, a Relay, or a micro SD slot - CNX Software](http://www.cnx-software.com/wp-content/uploads/2016/02/Wemos_D1_mini.jpg)
$4 Wemos D1 mini ESP8266 Board Supports Shields with a Temperature Sensor, a Button, a Relay, or a micro SD slot - CNX Software
Board generic (platform esp8266, package esp8266) is unknown · Issue #1514 · esp8266/Arduino · GitHub
![library - Arduino IDE: Board nodemcuv2 (platform esp8266, package esp8266) is unknown - Arduino Stack Exchange library - Arduino IDE: Board nodemcuv2 (platform esp8266, package esp8266) is unknown - Arduino Stack Exchange](https://i.stack.imgur.com/z27OA.jpg)
library - Arduino IDE: Board nodemcuv2 (platform esp8266, package esp8266) is unknown - Arduino Stack Exchange
![How to resolve “Board generic (platform esp8266, package esp8266) is unknown” error? — ESP8266 Arduino Core 3.1.2-7-g65579d29 documentation How to resolve “Board generic (platform esp8266, package esp8266) is unknown” error? — ESP8266 Arduino Core 3.1.2-7-g65579d29 documentation](https://arduino-esp8266.readthedocs.io/en/latest/_images/a04-arduino-ide-preferences.png)