Hi, As per the dmesg log, please add the Neoway N27 to a proper driver. lsusb Bus 001 Device 014: ID 2949:8620 Qualcomm, Incorporated Qualcomm CDMA Technologies MSM sudo modprobe usbserial vendor=0x2949 product=0x8620 [1989329.151331] usbcore: registered new interface driver usbserial_generic [1989329.151336] usbserial: USB Serial support registered for generic [1989329.151346] usbserial_generic 1-11:1.0: The "generic" usb-serial driver is only for testing and one-off prototypes. [1989329.151347] usbserial_generic 1-11:1.0: Tell linux-usb@xxxxxxxxxxxxxxx to add your device to a proper driver. [1989329.151348] usbserial_generic 1-11:1.0: generic converter detected [1989329.151429] usb 1-11: generic converter now attached to ttyUSB0 [1989329.151451] usbserial_generic 1-11:1.1: The "generic" usb-serial driver is only for testing and one-off prototypes. [1989329.151451] usbserial_generic 1-11:1.1: Tell linux-usb@xxxxxxxxxxxxxxx to add your device to a proper driver. [1989329.151452] usbserial_generic 1-11:1.1: generic converter detected [1989329.151486] usb 1-11: generic converter now attached to ttyUSB1 [1989329.151499] usbserial_generic 1-11:1.2: The "generic" usb-serial driver is only for testing and one-off prototypes. [1989329.151500] usbserial_generic 1-11:1.2: Tell linux-usb@xxxxxxxxxxxxxxx to add your device to a proper driver. [1989329.151501] usbserial_generic 1-11:1.2: generic converter detected [1989329.151526] usb 1-11: generic converter now attached to ttyUSB2 [1989329.151536] usbserial_generic 1-11:1.3: The "generic" usb-serial driver is only for testing and one-off prototypes. [1989329.151537] usbserial_generic 1-11:1.3: Tell linux-usb@xxxxxxxxxxxxxxx to add your device to a proper driver. [1989329.151538] usbserial_generic 1-11:1.3: generic converter detected [1989329.151567] usb 1-11: generic converter now attached to ttyUSB3 miniterm /dev/ttyUSB1 --- Miniterm on /dev/ttyUSB1 9600,8,N,1 --- --- Quit: Ctrl+] | Menu: Ctrl+T | Help: Ctrl+T followed by Ctrl+H --- at OK at OK Best regards, Christopher