diff --git a/static/i18n/en/app.json b/static/i18n/en/app.json
index 3b57aa53..f512dc30 100644
--- a/static/i18n/en/app.json
+++ b/static/i18n/en/app.json
@@ -902,6 +902,10 @@
     },
     "FeeNotLoaded": {
       "title": "Couldn’t load fee rates, please set manual fees"
+    },
+    "UnknownMCU": {
+      "title": "Unknown MCU version",
+      "description": "Please contact Ledger Support"
     }
   }
-}
\ No newline at end of file
+}