I have two GSM modules and one of them seemed to be faulty: the board' D4 ERR led (SGM module, 5.98) always ON since first switch on?. What can I need to check ?
Could it be a nework error? Have you tried exchanging the SIM cards between the two modules?
Also please check the antenna connection, and the ID settings
It's alright now. I have no answers why it' s OK now. Actually I did not change any on board ID, sim card, antenna... just after several full downloads for other responses' changes.
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