opkg install kmod-usb-net kmod-usb-net-qmi-wwan kmod-usb-serial-option
Visit the official TP-Link Support Page and download the latest firmware file for your specific region (e.g., EU). tp-link mr3420 v5 firmware
. Installing firmware for a different version can permanently damage your router. www.tp-link.com Download the Firmware : Visit the official TP-Link Download Center and download the latest firmware file for your region. Extract the File tp-link mr3420 v5 firmware