diff --git a/napalm_zyxel/zyxel_driver.py b/napalm_zyxel/zyxel_driver.py
index b49d61b..3b7c099 100644
--- a/napalm_zyxel/zyxel_driver.py
+++ b/napalm_zyxel/zyxel_driver.py
@@ -24,7 +24,6 @@ from napalm.base.exceptions import ConnectionClosedException, ConnectionExceptio
 
 from napalm_device_types import FingerprintRule, ResidentialGatewayDriver
 from napalm_device_types.models import (
-    DeviceActionResultDict,
     HostDict,
     NATTranslationDict,
     PortForwardDict,
@@ -806,42 +805,18 @@ class ZyxelVMGDriver(ResidentialGatewayDriver):
                     }
         return radios
 
-    def reboot(self) -> DeviceActionResultDict:
-        """Reboot the device via DAL."""
+    def reboot_host(self) -> None:
+        """Restart the gateway (``HostRebootMixin``); raises when it refuses."""
         result = self._dal_query("REBOOT", {"Command": "reboot"})
-        if result is not None and result.get("result") == "ZCFG_SUCCESS":
-            return {"success": True, "action": "reboot", "message": "Device is rebooting"}
-        return {"success": False, "action": "reboot", "message": "Reboot command failed"}
+        if result is None or result.get("result") != "ZCFG_SUCCESS":
+            raise RuntimeError(f"the gateway refused to reboot: {result}")
 
-    def run_device_action(self, action: str) -> DeviceActionResultDict:
-        """Run a device action such as reboot or WiFi restart."""
-        result: DeviceActionResultDict = {
-            "success": False,
-            "action": action,
-            "message": "",
-        }
-        try:
-            if action == "reboot":
-                return self.reboot()
-            elif action.startswith("restart_wifi"):
-                band = "both"
-                if ":" in action:
-                    band = action.split(":", 1)[1]
-                dal = self._dal_query("WIFI_RESTART", {"Band": band})
-                if dal is not None and dal.get("result") == "ZCFG_SUCCESS":
-                    result["success"] = True
-                    result["message"] = f"WiFi restarting ({band})"
-                else:
-                    result["message"] = "WiFi restart command failed"
-            elif action == "get_diagnostics":
-                diag = self._dal_query("DIAGNOSTICS", {})
-                if diag:
-                    result["success"] = True
-                    result["message"] = json.dumps(diag)
-                else:
-                    result["message"] = "Diagnostics not available"
-            else:
-                result["message"] = f"Unknown action: {action}"
-        except Exception as e:
-            result["message"] = f"Action '{action}' failed: {e}"
-        return result
+    def restart_wifi(self, band: str = "both") -> None:
+        """Restart the radios of *band* (``2.4G``, ``5G`` or ``both``); raises when refused."""
+        result = self._dal_query("WIFI_RESTART", {"Band": band})
+        if result is None or result.get("result") != "ZCFG_SUCCESS":
+            raise RuntimeError(f"the gateway refused to restart Wi-Fi ({band}): {result}")
+
+    def get_diagnostics(self) -> dict:
+        """What the gateway's diagnostics page reports; empty when it reports nothing."""
+        return self._dal_query("DIAGNOSTICS", {}) or {}
diff --git a/pyproject.toml b/pyproject.toml
index fcc6099..b40b5a2 100644
--- a/pyproject.toml
+++ b/pyproject.toml
@@ -4,7 +4,7 @@ build-backend = "setuptools.build_meta"
 
 [project]
 name = "napalm-zyxel"
-version = "0.1.0"
+version = "0.2.0"
 description = "NAPALM driver for Zyxel VMG series residential gateways (VMG4005-B50A and similar)."
 readme = "README.md"
 license = { text = "Apache-2.0" }
diff --git a/tests/test_zyxel.py b/tests/test_zyxel.py
index a937137..904020c 100644
--- a/tests/test_zyxel.py
+++ b/tests/test_zyxel.py
@@ -1,6 +1,7 @@
 import json
 from unittest.mock import MagicMock, patch
 
+import pytest
 import requests
 
 from napalm.base.exceptions import ConnectionException
@@ -285,16 +286,20 @@ class TestZyxelVMGDriver:
         self._setup_mocked_http()
         assert self.driver.get_arp_table() == []
 
-    def test_reboot(self):
-        self._setup_mocked_http()
-        result = self.driver.run_device_action("reboot")
-        assert result["action"] == "reboot"
+    def test_reboot_host_is_the_contract_the_application_calls(self):
+        """It was reboot(), which nothing looks for: the gateway could not be
+        restarted from the application (#5)."""
+        self.driver._dal_query = lambda name, data: {"result": "ZCFG_SUCCESS"}
+        assert self.driver.reboot_host() is None
 
-    def test_run_device_action_unknown(self):
-        self._setup_mocked_http()
-        result = self.driver.run_device_action("foobar")
-        assert result["success"] is False
-        assert "Unknown" in result["message"]
+    def test_a_refused_reboot_raises(self):
+        self.driver._dal_query = lambda name, data: {"result": "ZCFG_FAIL"}
+        with pytest.raises(RuntimeError):
+            self.driver.reboot_host()
+
+    def test_run_device_action_and_reboot_are_gone(self):
+        assert not hasattr(type(self.driver), "run_device_action")
+        assert not hasattr(type(self.driver), "reboot")
 
     def test_load_replace_candidate_raises(self):
         self._setup_mocked_http()