Home Page Forums Raspberry Pi Shields Sixfab 3G,4G/LTE shield – GPS – +CME ERROR 504

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    I have your Sixfab 3G,4G/LTE shield and EC25 module. I followed your tutorial https://sixfab.com/gps-tracker-with-3g-4glte-shield/ and I have problem. When I write down AT+QGPS=1 in minicom I get “+CME error: 504”. Do you know why? Besides I don’t see what I typing in minicom (like typing of a password).

    I work on Raspberry Pi 3, Ubuntu Mate.

    Thanks in advance for any clue

    Best Regards



    Hi Stainslaw,

    Could you please try with other port. CME error 504 means a session is ongoing. Could you please check from other port?

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