fjmorazan Josengel Have you tried to look if the modem appears available on the settings of network plasmoid? Unfortunately the modem I own left to work some years ago😅 so i can't tell the steps to follow on kde
bvbfan It should be supported, right click on network icon (in systray) configure and add new DSL (by default ppp and modemmanager are installed, you can verified by searching in octopi)
demm Closing this topic since this is a complete unsupported install and can't be updated to current KaOS.