diff --git a/src/CHANGES.md b/src/CHANGES.md
index 8bdd6c40..34ced30b 100644
--- a/src/CHANGES.md
+++ b/src/CHANGES.md
@@ -1,7 +1,8 @@
 # Development Changes
 
 ## 0.8.120 - 2024-05-18
-* fix crash if invalid serial number was set
+* fix crash if invalid serial number was set -> inverter will be disabled automatically
+* improved and fixed factory image generation
 
 ## 0.8.119 - 2024-05-17
 * fix reset values at midnight if WiFi isn't available #1620
diff --git a/src/hm/hmSystem.h b/src/hm/hmSystem.h
index e6274696..cb4103bd 100644
--- a/src/hm/hmSystem.h
+++ b/src/hm/hmSystem.h
@@ -74,7 +74,7 @@ class HmSystem {
                     iv->ivRadioType = INV_RADIO_TYPE_CMT;
             } else if(iv->config->serial.u64 != 0ULL) {
                 DPRINTLN(DBG_ERROR, F("inverter type can't be detected!"));
-                iv->config = nullptr;
+                iv->config->enabled = false;
                 return;
             } else
                 iv->ivGen = IV_UNKNOWN;
diff --git a/src/platformio.ini b/src/platformio.ini
index 9f226af0..30436414 100644
--- a/src/platformio.ini
+++ b/src/platformio.ini
@@ -23,7 +23,7 @@ extra_scripts =
     pre:../scripts/convertHtml.py
     pre:../scripts/applyPatches.py
     pre:../scripts/reduceGxEPD2.py
-    #post:../scripts/add_littlefs_binary.py
+    post:../scripts/add_littlefs_binary.py
 
 lib_deps =
     https://github.com/esphome/ESPAsyncWebServer @ ^3.2.0