ACTION=="add", SUBSYSTEM=="usb", ATTRidVendor=="19d2", ATTRidProduct=="1405", RUN+="/usr/sbin/usb_modeswitch -v 19d2 -p 1405 -M '5553424312345678000000000000061e000000000000000000000000000000'" Then:
lsusb | grep 19d2 # Example: 19d2:1403 (storage mode) Install usb-modeswitch and add config: zte at interface driver
sudo usb_modeswitch -c /etc/usb_modeswitch.d/19d2:1403 sudo modprobe cdc_acm sudo modprobe option sudo modprobe qcserial # for newer ZTE LTE modules Step 4: Verify AT Port After switching, check: zte at interface driver
ls /dev/ttyUSB* # or /dev/ttyACM* dmesg | grep -i zte Typical output: zte at interface driver
usb 1-2: ZTE MF833U1 Modem (CDC ACM) → ttyACM0 (AT) usb 1-2: ZTE MF833U1 PCUI → ttyUSB1 Create /etc/udev/rules.d/99-zte-modem.rules :
sudo apt install usb-modeswitch Create /etc/usb_modeswitch.d/19d2:1403 :
TargetVendor=0x19d2 TargetProduct=0x1405 MessageContent="5553424312345678000000000000061e000000000000000000000000000000" Then trigger switch: