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Activate the TTL serial port of the Raspberry Pi and verify that it is working. – Howto Raspberry Pi
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screen - How can I test if the serial / UART is good on a Raspberry Pi? - Raspberry Pi Stack Exchange
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Problem interfacing Nextion display with Raspberry Pi 4 - Software Development - Unofficial Nextion/TJC User Forum
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Activate the TTL serial port of the Raspberry Pi and verify that it is working. – Howto Raspberry Pi
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