we are trying to use a EM9191 (via the Sierra Wireless M.2 Developer Kit EM9/EM76 Series) connected to a Linux laptop. We found that the modem is detected using the qmi_wwan (although only using the MBIM mode and without being able to use the USB port for serial connection) and that we are able to connect them to 4G networks by using the last version of the libqmi library. However, the modem fails when trying to connect to 5G NSA o 5G SA networks. In some cases, we found that the qmicli client retrieves a 5G signal strength which seems to be totally wrong (-32768 dBm )
Did somebody have success in connecting this device to a 5G NSA or SA network? We are thinking that maybe we have an issue with the FW of the modem, but we saw that in the official web page there is not info about any FW relase.
Also, do you know how to activate the serial support in order to send AT commands. We tried to bind the device to the “option” module, but it didn’t work. Should we use the GobiNet driver?