Problem when try to access serial port of ZTE cellular modem

I'm trying to access the serial port of ZTE MF831 cellular modem. I can access the serial port from Windows using the driver "ZTE Proprietary USB Modem" (modem.sys, ZTEusbmdm6k.sys) But I can't access it from the raspberry pi, I've tried: minicom -D /dev/ttyUSB0 -b 9600 but i can't input anything and there is no output, I've also tried to read/write using cat/echo to /dev/ttyUSB0 without success **lsusb** Bus 001 Device 011: ID 19d2:0016 ZTE WCDMA Technologies MSM ZTE Wireless Ethernet Adapter **dmesg** [13336096.289113] usb 1-1.3: new high-speed USB device number 11 using xhci_hcd [13336096.423536] usb 1-1.3: New USB device found, idVendor=19d2, idProduct=0016, bcdDevice=52.45 [13336096.423565] usb 1-1.3: New USB device strings: Mfr=1, Product=2, SerialNumber=3 [13336096.423579] usb 1-1.3: Product: ZTE Wireless Ethernet Adapter [13336096.423589] usb 1-1.3: Manufacturer: ZTE,Incorporated [13336096.444144] option 1-1.3:1.0: GSM modem (1-port) converter detected [13336096.444559] usb 1-1.3: GSM modem (1-port) converter now attached to ttyUSB0 > Update **sudo journalctl --follow** Oct 03 01:00:59 raspberrypi kernel: usb 1-1.3: GSM modem (1-port) converter now attached to ttyUSB0 Oct 03 01:00:59 raspberrypi mtp-probe: checking bus 1, device 14: "/sys/devices/platform/scb/fd500000.pcie/pci0000:00/0000:00:00.0/0000:01:00.0/usb1/1-1/1-1.3" Oct 03 01:00:59 raspberrypi mtp-probe: bus: 1, device: 14 was not an MTP device Oct 03 01:00:59 raspberrypi mtp-probe: checking bus 1, device 14: "/sys/devices/platform/scb/fd500000.pcie/pci0000:00/0000:00:00.0/0000:01:00.0/usb1/1-1/1-1.3" Oct 03 01:00:59 raspberrypi mtp-probe: bus: 1, device: 14 was not an MTP device Oct 03 01:01:13 raspberrypi ModemManager: [ttyUSB0/probe] failed to parse QCDM version info command result: -7 Oct 03 01:01:13 raspberrypi ModemManager: [ttyUSB0/probe] failed to parse QCDM version info command result: -7 Oct 03 01:01:13 raspberrypi ModemManager: [device /sys/devices/platform/scb/fd500000.pcie/pci0000:00/0000:00:00.0/0000:01:00.0/usb1/1-1/1-1.3] creating modem with plugin 'zte' and '1' ports Oct 03 01:01:13 raspberrypi ModemManager: [plugin/zte] could not grab port ttyUSB0: Cannot add port 'tty/ttyUSB0', unhandled port type Oct 03 01:01:13 raspberrypi ModemManager: [base-manager] couldn't create modem for device '/sys/devices/platform/scb/fd500000.pcie/pci0000:00/0000:00:00.0/0000:01:00.0/usb1/1-1/1-1.3': Failed to find primary AT port **usb-devices** T: Bus=01 Lev=02 Prnt=02 Port=02 Cnt=01 Dev#= 15 Spd=480 MxCh= 0 D: Ver= 2.00 Cls=00(>ifc ) Sub=00 Prot=00 MxPS=64 #Cfgs= 1 P: Vendor=19d2 ProdID=0016 Rev=52.45 S: Manufacturer=ZTE,Incorporated S: Product=ZTE Wireless Ethernet Adapter C: #Ifs= 3 Cfg#= 1 Atr=a0 MxPwr=500mA I: If#= 0 Alt= 0 #EPs= 2 Cls=ff(vend.) Sub=ff Prot=ff Driver=option E: Ad=01(O) Atr=02(Bulk) MxPS= 512 Ivl=0ms E: Ad=81(I) Atr=02(Bulk) MxPS= 512 Ivl=0ms I: If#= 1 Alt= 0 #EPs= 3 Cls=ff(vend.) Sub=00 Prot=00 Driver=(none) E: Ad=02(O) Atr=02(Bulk) MxPS= 512 Ivl=0ms E: Ad=82(I) Atr=02(Bulk) MxPS= 512 Ivl=0ms E: Ad=83(I) Atr=03(Int.) MxPS= 10 Ivl=32ms I: If#= 2 Alt= 0 #EPs= 3 Cls=ff(vend.) Sub=00 Prot=00 Driver=(none) E: Ad=03(O) Atr=02(Bulk) MxPS= 512 Ivl=0ms E: Ad=84(I) Atr=02(Bulk) MxPS= 512 Ivl=0ms E: Ad=85(I) Atr=03(Int.) MxPS= 10 Ivl=32ms **permissions** $ id -a uid=1000(pi) gid=1000(pi) groups=1000(pi),20(dialout) $ ls -l /dev/ttyUSB0 crw-rw---- 1 root dialout 188, 0 Oct 3 01:45 /dev/ttyUSB0 I've also tried to disable ModemManager and then try to connect using minicom but i get the same result