Zebra Setup Utilities > select printer > Open Communication with Printer

! U1 setvar "device.languages" "zpl"<CR><LF>
{}{
  "protect": {
    "authentication": {
      "username": "admin",
      "password": "",
      "type": "basic"
    },
    "operation": "setup",
    "setup": {
      "username": "admin",
      "password": "Fasepalu56047!"
    }
  }
}
{}{
  "protect": {
    "authentication": {
      "username": "admin",
      "password": "Fasepalu56047!",
      "type": "basic"
    },
    "operation": "configure-one",
    "configure-one": {
      "protected-mode-allowed": "no"
    }
  }
}
{}{
  "protect": {
    "authentication": {
      "username": "admin",
      "password": "Fasepalu56047!",
      "type": "basic"
    },
    "operation": "set",
    "set": {
      "device.allow_firmware_downloads": "yes",
      "ip.tcp.enable": "on",
      "ip.lpd.enable": "off",
      "ip.http.enable": "on",
      "ip.https.enable": "on",
      "ip.ftp.enable": "off",
      "ip.snmp.enable": "off",
      "wlan.enable": "off",
      "usb.mirror.enable": "off",
      "zbi.enable": "off",
      "display.password.current": "",
      "ip.http.admin_password": "1234"
    }
  }
}
{}{
  "protect": {
    "authentication": {
      "username": "admin",
      "password": "Fasepalu56047!",
      "type": "basic"
    },
    "operation": "set",
    "set": {
      "device.prompted_network_reset": "yes"
    }
  }
}
! U1 setvar "device.restore_defaults" "device.languages"<CR><LF>