: Essential for using ZTE USB dongles or mobile hotspots to connect to the internet.
| Issue | Likely cause | Solution | |--------|----------------|------------| | Driver install fails | Old driver remains | Use tool | | AT port disappears after reboot | Windows driver signature enforcement | Disable Secure Boot temporarily | | No response to AT commands | Wrong baud rate or flow control | Use 115200, 8N1, no hardware flow | | Linux: /dev/ttyUSB* not created | Missing usbserial module | sudo modprobe usbserial vendor=0x19d2 product=0x1405 | zte at interface driver upd