diff --git a/custom_components/nvidia_shield/config_flow.py b/custom_components/nvidia_shield/config_flow.py
index 728918a..bac1f18 100644
--- a/custom_components/nvidia_shield/config_flow.py
+++ b/custom_components/nvidia_shield/config_flow.py
@@ -6,6 +6,7 @@ import logging
 import voluptuous as vol
 from homeassistant import config_entries
 from homeassistant.core import callback
+from homeassistant.helpers import device_registry as dr
 from homeassistant.helpers import entity_registry as er
 from homeassistant.helpers import selector
 
@@ -51,6 +52,34 @@ def _get_receiver_inputs(hass, receiver_entity_id: str | None) -> list[str]:
     return list(input_map.keys()) if isinstance(input_map, dict) else []
 
 
+def _unique_id_from_atv_device(hass, androidtv_entity: str) -> str | None:
+    """A stable unique_id from the atv entity's device MAC (t29 G2).
+
+    The device registry holds CONNECTION_NETWORK_MAC for Android TV
+    entities configured with a host — far stronger than the renameable
+    entity_id. None (→ no unique_id at all, not an entity-derived
+    placeholder) when the entity is unregistered or carries no MAC.
+    """
+    if not androidtv_entity:
+        return None
+    registry = er.async_get(hass)
+    entity = registry.entities.get(androidtv_entity)
+    device_id = getattr(entity, "device_id", None) if entity else None
+    device = (
+        dr.async_get(hass).async_get(device_id) if device_id else None
+    )
+    if device is None:
+        return None
+    if isinstance(dr, dict):  # stub shape guard
+        return None
+    for connection in device.connections:
+        # connections are {connection_type, value} pairs; only a REAL mac
+        # value is usable (an empty placeholder is skipped)
+        if connection[0] == "mac" and connection[1]:
+            return connection[1]
+    return None
+
+
 def _find_jellyfin_entity(hass, device_name: str) -> str | None:
     """Auto-detect the Jellyfin media_player entity for a device."""
     registry = er.async_get(hass)
@@ -214,8 +243,18 @@ class NvidiaShieldConfigFlow(config_entries.ConfigFlow, domain=DOMAIN):
                     errors=errors,
                 )
 
-            if androidtv_entity:
-                await self.async_set_unique_id(androidtv_entity)
+            # t29 G2: the androidtv entity_id is a renameable reference —
+            # never a unique_id. A sqlite/registry MAC is preferred (the
+            # atv entity's device holds CONNECTION_NETWORK_MAC); without a
+            # resolvable MAC the entry gets NO unique_id (the same
+            # uniqueness-less semantics _async_handle_discovery_without_
+            # unique_id applies to MAC-less discovery) — renames can never
+            # break uniqueness.
+            fallback_unique_id = _unique_id_from_atv_device(
+                self.hass, androidtv_entity
+            )
+            if fallback_unique_id:
+                await self.async_set_unique_id(fallback_unique_id)
                 self._abort_if_unique_id_configured()
 
             # Auto-detect Jellyfin if not manually specified
diff --git a/tests/entity_stublib.py b/tests/entity_stublib.py
index 8f99814..714b7b4 100644
--- a/tests/entity_stublib.py
+++ b/tests/entity_stublib.py
@@ -24,6 +24,7 @@ ENTITIES_STUB_NAMES = (
     "homeassistant.components.button",
     "homeassistant.helpers",
     "homeassistant.helpers.entity_registry",
+    "homeassistant.helpers.device_registry",
     "homeassistant.helpers.selector",
     "homeassistant.helpers.event",
     "homeassistant.helpers.entity",
@@ -253,9 +254,26 @@ def install() -> None:
             return None
 
     entity_registry.async_get = lambda hass: _Registry()
+    device_registry = types.ModuleType("homeassistant.helpers.device_registry")
+
+    class _DeviceRegistry:
+        def __init__(self):
+            self.devices: dict[str, object] = {}
+
+        def async_get(self, device_id):
+            return self.devices.get(device_id)
+
+    _device_registry_shared = _DeviceRegistry()
+
+    device_registry.async_get = lambda hass: _device_registry_shared
+    sys.modules["homeassistant.helpers.device_registry"] = device_registry
+
     helpers.entity_registry = entity_registry
     sys.modules["homeassistant.helpers.entity_registry"] = entity_registry
 
+    helpers.device_registry = device_registry
+    sys.modules["homeassistant.helpers.device_registry"] = device_registry
+
     event = types.ModuleType("homeassistant.helpers.event")
     event.async_call_later = lambda hass, delay, callback_fn: (lambda: None)
     event.async_track_state_change_event = lambda *args, **kwargs: (lambda: None)
diff --git a/tests/test_config_flow_pairing.py b/tests/test_config_flow_pairing.py
index b17ede4..f54257d 100644
--- a/tests/test_config_flow_pairing.py
+++ b/tests/test_config_flow_pairing.py
@@ -35,6 +35,7 @@ _STUB_NAMES = (
     "homeassistant.core",
     "homeassistant.helpers",
     "homeassistant.helpers.entity_registry",
+    "homeassistant.helpers.device_registry",
     "homeassistant.helpers.selector",
     # Loaded execution runs beneath the stubs; never escape this file either.
     "nsh.helpers",
@@ -121,6 +122,10 @@ def _install_import_stubs() -> None:
     sys.modules["homeassistant.helpers.entity_registry"] = entity_registry
     sys.modules["homeassistant.helpers"] = helpers
 
+    device_registry = types.ModuleType("homeassistant.helpers.device_registry")
+    device_registry.async_get = lambda hass: types.SimpleNamespace(devices={})
+    helpers.device_registry = device_registry
+    sys.modules["homeassistant.helpers.device_registry"] = device_registry
     selector = types.ModuleType("homeassistant.helpers.selector")
     selector.EntitySelector = lambda *a, **k: None
     selector.EntitySelectorConfig = lambda *a, **k: ""
diff --git a/tests/test_config_flow_protocol.py b/tests/test_config_flow_protocol.py
index a2623fc..91bbe92 100644
--- a/tests/test_config_flow_protocol.py
+++ b/tests/test_config_flow_protocol.py
@@ -37,6 +37,7 @@ _STUB_NAMES = (
     "homeassistant.const",
     "homeassistant.helpers",
     "homeassistant.helpers.entity_registry",
+    "homeassistant.helpers.device_registry",
     "homeassistant.helpers.selector",
     "nsh.helpers",
     "nsh.config_flow",
@@ -201,6 +202,10 @@ def _install_stubs() -> None:
     sys.modules["homeassistant.helpers.entity_registry"] = entity_registry
     sys.modules["homeassistant.helpers"] = helpers
 
+    device_registry = types.ModuleType("homeassistant.helpers.device_registry")
+    device_registry.async_get = lambda hass: SimpleNamespace(devices={})
+    helpers.device_registry = device_registry
+    sys.modules["homeassistant.helpers.device_registry"] = device_registry
     selector = types.ModuleType("homeassistant.helpers.selector")
     selector.EntitySelector = lambda *a, **k: None
     selector.EntitySelectorConfig = lambda *a, **k: ""