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Is “LoRa-E5-HF ” printed on the front of your LoRa-E5 mini package?
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Please show me what the serial monitor shows when you run your sketch of POST4.
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Show me your setup: what and how are you connecting to the LoRa-E5 mini?
Are you connecting devices like POST8 in the link?
‘Programming LoRa-E5 with Arduino, LoRa-E5 mini Point to Point Comminucation over 24 km - #8 by msfujino’