diff --git a/examples/DiyProIndoorV3_3/DiyProIndoorV3_3.ino b/examples/DiyProIndoorV3_3/DiyProIndoorV3_3.ino
index 9a85a6e..52297e4 100644
--- a/examples/DiyProIndoorV3_3/DiyProIndoorV3_3.ino
+++ b/examples/DiyProIndoorV3_3/DiyProIndoorV3_3.ino
@@ -70,7 +70,7 @@ static MqttClient mqttClient(Serial);
 
 static int pmFailCount = 0;
 static int getCO2FailCount = 0;
-static AgFirmwareMode fwMode = FW_MODE_I_37PS;
+static AgFirmwareMode fwMode = FW_MODE_I_33PS;
 
 static String fwNewVersion;
 
@@ -451,7 +451,7 @@ static void boardInit(void) {
     }
   }
 
-  localServer.setFwMode(FW_MODE_I_37PS);
+  localServer.setFwMode(FW_MODE_I_33PS);
 }
 
 static void failedHandler(String msg) {
diff --git a/src/App/AppDef.cpp b/src/App/AppDef.cpp
index 457e385..0b42232 100644
--- a/src/App/AppDef.cpp
+++ b/src/App/AppDef.cpp
@@ -16,8 +16,8 @@ const char *AgFirmwareModeName(AgFirmwareMode mode) {
     return "O-1P";
   case FW_MODE_I_42PS:
     return "DIY-PRO-I-4.2PS";
-  case FW_MODE_I_37PS:
-    return "DIY-PRO-I-3.7PS";
+  case FW_MODE_I_33PS:
+    return "DIY-PRO-I-3.3PS";
   case FW_MODE_I_BASIC_40PS:
     return "DIY-BASIC-I-4.0PS";
   default:
diff --git a/src/App/AppDef.h b/src/App/AppDef.h
index 6de05fa..3bb9320 100644
--- a/src/App/AppDef.h
+++ b/src/App/AppDef.h
@@ -102,7 +102,7 @@ enum AgFirmwareMode {
   FW_MODE_O_1PS,  /** PMS5003T, S8 */
   FW_MODE_O_1P,   /** PMS5003T */
   FW_MODE_I_42PS, /** DIY_PRO 4.2 */
-  FW_MODE_I_37PS, /** DIY_PRO 3.7 */
+  FW_MODE_I_33PS, /** DIY_PRO 3.3 */
   FW_MODE_I_BASIC_40PS, /** DIY_BASIC 4.0 */
 };
 const char *AgFirmwareModeName(AgFirmwareMode mode);