Keyestudio EASY PLUG Ultimate Starter Kit Manual page 225

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Troubleshooting:
 OLED Not Lighting Up?
If upload the code successfully, but LED still not lights up. Make sure your
board and OLED module are connected correctly.
 Upload Failed ?
This happens sometimes, the most likely case is a confused Board and serial
port, you should firstly select your proper board and port.
Or check whether add the library or not.
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