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I am trying to get a SIM7600E-H-4G-HAT running on my Raspberry Pi 3B+, but it is not working. Here is what I've done so far:

  1. Inserted my SIM-Card, connected the antenna to Main, connected the entire hat via GPIO pins to my Pi without any USB cable connected to that hat. I left the two yellow jumpers factory-default like, centered just as pictured in the manual.

  2. I booted the raspberry, set via raspi-config the serial options as described in the manual (no, then yes).

  3. chmod 777 for sim7600_4G_hat_init and added sh /home/.../sim7600_4G_hat_init to rc.local

  4. Rebooted, installed minicom, started sudo minicom -D /dev/ttyS0 and nothing happens and it does not even react on any keystroke. I even compiled the bcm2835 directory and the phoncecall-demo. When I try to sudo ./Phonecall it says

Failed to get byte count on serial.

Both LEDs shine red permanently. What am I doing wrong?

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    You are doing wrong to use rc.local if using an operating system with systemd like Raspbian or Ubuntu or arch. Please take note that using /etc/rc.local has limitations due to Compatibility with SysV. We have seen many problems here on this site using it. Following the recommendation of the developers from systemd you should avoid using it. – Ingo Sep 20 at 22:28

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