Board Manager - TheAmadeus25/CounterStrike-GlobalOffensive-Ambilight-System GitHub Wiki

The easiest and most reliable way to do this is, by using the download-manager inside the IDE. Just click Tool → Board:xxx → Board Manager

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Download and install following board

Library	Team/Programmer	Version
esp8266	ESP8266 Community	2.4.1

Note! Don't use 2.4.0 or 2.4.2! Both are bugged at the moment.