diff --git a/homeassistant/components/zwave_js/update.py b/homeassistant/components/zwave_js/update.py
index 02c59d220e1..d060abe007d 100644
--- a/homeassistant/components/zwave_js/update.py
+++ b/homeassistant/components/zwave_js/update.py
@@ -155,7 +155,8 @@ class ZWaveNodeFirmwareUpdate(UpdateEntity):
         progress: NodeFirmwareUpdateProgress = event["firmware_update_progress"]
         if not self._latest_version_firmware:
             return
-        self._attr_in_progress = int(progress.progress)
+        self._attr_in_progress = True
+        self._attr_update_percentage = int(progress.progress)
         self.async_write_ha_state()
 
     @callback
@@ -181,6 +182,7 @@ class ZWaveNodeFirmwareUpdate(UpdateEntity):
         self._result = None
         self._finished_event.clear()
         self._attr_in_progress = False
+        self._attr_update_percentage = None
         if write_state:
             self.async_write_ha_state()
 
@@ -267,6 +269,7 @@ class ZWaveNodeFirmwareUpdate(UpdateEntity):
         assert firmware
         self._unsub_firmware_events_and_reset_progress(False)
         self._attr_in_progress = True
+        self._attr_update_percentage = None
         self.async_write_ha_state()
 
         self._progress_unsub = self.node.on(