Hi everyone, please be patient, it is my first post on this forum and I have little experience with Banana Pi.
I’m currently using a BPI BR-4 with a Quectel EM05-G the modem is properly being detected by the Banana Pi, but not the SIMM card. From the mmcli I get failed sim-missing power state off.
I have exactly the same modem installed and it took me a while to figure out how to set it up. The most likely issue is that your modem tries to use eSIM by default, which is not present. Try using the mmcli -m 1 --set-primary-sim-slot=0 command to switch to the physical SIM. I’m not sure this is the one I used to get my modem working, but it pops up on search.
Next, you might want to see if your modem has FCC lock enabled (see post).
try AT+CPIN? , or AT+CIMI , you will see that SIM is not detected, reason is about inverse logic of the SIM holder vs schematic.
Look in Quectel manual for command to disable SIM detection contact, or invert the logic by command.
I described this issue in some of my other forum contributions.