Index: MsgDefs.h
===================================================================
diff -u -r634cc5f1560314ad2caf8fc63d4be3c518d89469 -r0c3614d99709d6ecbc213397bc7915c2aeb2d787
--- MsgDefs.h	(.../MsgDefs.h)	(revision 634cc5f1560314ad2caf8fc63d4be3c518d89469)
+++ MsgDefs.h	(.../MsgDefs.h)	(revision 0c3614d99709d6ecbc213397bc7915c2aeb2d787)
@@ -195,8 +195,8 @@
     MSG_ID_UI_WATER_SAMPLE_RESULT_REQUEST = 0xA3,                                   ///< UI water sample result request
     MSG_ID_UI_PRESSURE_LIMIT_WIDEN_REQUEST = 0xA4,                                  ///< UI pressure limit widen request.
     MSG_ID_TD_PRESSURE_LIMIT_WIDEN_RESPONSE = 0xA5,                                 ///< TD pressure limit widen response.
-    MSG_ID_TD_SIGNAL_UPDATE_AVAILABLE = 0xA6,                                       ///< TD signal update is available.
-    MSG_ID_DD_SIGNAL_UPDATE_AVAILABLE = 0xA7,                                       ///< DD signal update is available.
+    MSG_ID_FFU_SIGNAL_TD_UPDATE_AVAILABLE = 0xA6,                                   ///< FFU signal TD update is available.
+    MSG_ID_FFU_SIGNAL_DD_UPDATE_AVAILABLE = 0xA7,                                   ///< FFU signal DD update is available.
 
     // service/test CAN messages
     MSG_ID_FIRST_TD_TESTER_MESSAGE = 0x8000,                                        ///< First TD test message ID
Index: TDDefs.h
===================================================================
diff -u -r413aa187b32921babc077451fb7c98578707497b -r0c3614d99709d6ecbc213397bc7915c2aeb2d787
--- TDDefs.h	(.../TDDefs.h)	(revision 413aa187b32921babc077451fb7c98578707497b)
+++ TDDefs.h	(.../TDDefs.h)	(revision 0c3614d99709d6ecbc213397bc7915c2aeb2d787)
@@ -35,6 +35,7 @@
     MODE_PRET,                           ///< Pre-Treatment mode
     MODE_TREA,                           ///< Treatment mode
     MODE_POST,                           ///< Post-Treatment mode
+    MODE_UPDT,                           ///< Update mode
     MODE_NLEG,                           ///< Not legal - an illegal mode transition occurred
     NUM_OF_MODES                         ///< Number of TD operation modes
 };
@@ -112,6 +113,22 @@
 /**@}*/
 
 /**
+ *  @addtogroup TDUpdateMode
+ *  @{
+ */
+
+/// Sub-mode states while in update mode
+enum TD_Update_States
+{
+    UPDATE_INIT_STATE = 0,                                       ///< Start update state.
+    UPDATE_RESET_MCU_STATE,                                      ///< Reset MCU state.
+    NUM_OF_UPDATE_STATES                                         ///< Number of update states (sub-modes).
+};
+typedef enum TD_Update_States TD_UPDATE_STATE_T;                 ///< Type for TD update states enumeration
+
+/**@}*/
+
+/**
  *  @addtogroup TDPreTreatmentMode
  *  @{
  */