diff --git a/__init__.py b/__init__.py
index 92dbb10..3a243b6 100644
--- a/__init__.py
+++ b/__init__.py
@@ -596,6 +596,22 @@ def _ensure_cron_script():
     except Exception as e:
         logger.debug(f"ensure cron script failed: {e}")
 
+def _try_restart_dashboard():
+    for cmd in [
+        ["systemctl","--user","restart","hermes-dashboard.service"],
+        ["systemctl","--user","restart","hermes-dashboard"],
+        ["bash","-c","hermes dashboard --stop; sleep 1; nohup hermes dashboard --host 0.0.0.0 --port 9119 --no-open > /tmp/hermes-dashboard.log 2>&1 &"],
+        ["bash","-c","pkill -f 'hermes.*dashboard'; sleep 1; nohup hermes dashboard --host 0.0.0.0 --port 9119 --no-open > /tmp/hermes-dashboard.log 2>&1 &"],
+    ]:
+        try:
+            subprocess.Popen(cmd, stdout=subprocess.DEVNULL, stderr=subprocess.DEVNULL, stdin=subprocess.DEVNULL, start_new_session=True)
+            logger.info(f"dashboard restart tried: {' '.join(cmd)}")
+            return True
+        except Exception as e:
+            logger.debug(f"dashboard restart {cmd} failed: {e}")
+            continue
+    return False
+
 def register(ctx):
     # ensure cron script is available in HERMES_HOME/scripts for no_agent cron
     _ensure_cron_script()
@@ -629,6 +645,39 @@ def register(ctx):
 
     threading.Thread(target=_auto_start, daemon=True).start()
 
+    # also auto-restart dashboard if backend 404 (plugin updated but dashboard not restarted)
+    def _auto_restart_dashboard_check():
+        try:
+            time.sleep(5)
+            # check if dashboard backend is 404
+            import urllib.request, json as _j
+            for _ in range(3):
+                try:
+                    req = urllib.request.urlopen("http://127.0.0.1:9119/api/plugins/sshx-link/status", timeout=3)
+                    # if 200, backend mounted, no need
+                    if req.status == 200:
+                        return
+                except Exception as e:
+                    # try to detect 404 via HTTPError
+                    try:
+                        if hasattr(e, 'code') and e.code == 404:
+                            logger.info("dashboard backend 404 detected, trying restart")
+                            _try_restart_dashboard()
+                            return
+                    except Exception:
+                        pass
+                    # also try via status code in exception
+                    if "404" in str(e):
+                        _try_restart_dashboard()
+                        return
+                time.sleep(2)
+            # also check link file exists but dashboard not showing it
+            if _read_link_file() and not _is_sshx_alive():
+                _try_restart_dashboard()
+        except Exception as e:
+            logger.debug(f"auto restart check failed: {e}")
+    threading.Thread(target=_auto_restart_dashboard_check, daemon=True).start()
+
     ctx.register_tool(
         name="sshx_start",
         toolset="sshx-link",
diff --git a/dashboard/manifest.json b/dashboard/manifest.json
index b53671f..db19703 100644
--- a/dashboard/manifest.json
+++ b/dashboard/manifest.json
@@ -3,7 +3,7 @@
   "label": "sshx.io Terminal",
   "description": "Auto-start sshx via nohup/systemd, copy cron script to HERMES_HOME/scripts, dashboard visible",
   "icon": "Terminal",
-  "version": "2.5.7",
+  "version": "2.5.8",
   "tab": {
     "path": "/sshx",
     "position": "end"
diff --git a/plugin.yaml b/plugin.yaml
index c884c9b..b79bb7f 100644
--- a/plugin.yaml
+++ b/plugin.yaml
@@ -1,5 +1,5 @@
 name: sshx-link
-version: 2.5.7
+version: 2.5.8
 description: Auto-start sshx via nohup/systemd, copy cron script to HERMES_HOME/scripts, dashboard visible
 author: sisyphus
 provides_tools: