@rolandlo @fabrice Perhaps you could try porting the modem to ModemManager. That should be relatively easy given that it uses AT commands like most other modems. I have been avoiding ModemManager due to its GObject coding style, but all Gnome-based UIs use it. Note that you can also try SailfishOS with the mainline kernel, which works somewhat better than postmarketOS: https://forum.sailfishos.org/t/mainline-linux-kernel-for-the-jolla-c2/21382/5 To get the camera working on pmOS, apply the patches on top of 0.5.2 like this: https://storage.abscue.de/private/zImage/pmaports-libcamera.tar.gz