Some MF833T units need mode switching. If it stays in “CD-ROM mode”:
While the device is excellent, the drivers included in the "Zero-CD" (the virtual CD drive that mounts when you plug it in) can sometimes be outdated or incomplete, particularly on newer versions of Windows 10 or Windows 11. zte mf833t driver full
Модем 3G/4G ZTE MF833T (836F) - GSM-Репитеры.РУ Some MF833T units need mode switching
sudo ip link set usb0 up sudo dhclient usb0 zte mf833t driver full