Index: firmware/App/Services/Messaging.c
===================================================================
diff -u -rc288f2956e37f1f0b964b077af7c39b6387a5df6 -rd913a6ef52c316170124fe56ed66b2976df9782f
--- firmware/App/Services/Messaging.c	(.../Messaging.c)	(revision c288f2956e37f1f0b964b077af7c39b6387a5df6)
+++ firmware/App/Services/Messaging.c	(.../Messaging.c)	(revision d913a6ef52c316170124fe56ed66b2976df9782f)
@@ -7,8 +7,8 @@
 *
 * @file    Messaging.c
 *
-* @author  (last)      Praneeth Bunne
-* @date    (last)      21-May-2026
+* @author  (last)      Dara Navaei
+* @date    (last)      27-May-2026
 *
 * @author  (original)  Sean Nash
 * @date    (original)  01-Aug-2024
@@ -130,6 +130,7 @@
     { MSG_ID_UI_TREATMENT_SET_POINT_BLOOD_FLOW_CHANGE_REQUEST,          &bloodPrimeHandleBloodFlowChangeRequest },
     { MSG_ID_UI_ADJUST_DISPOSABLES_CONFIRM_REQUEST,                     &handleAutoLoadRequest },
     { MSG_ID_UI_ADJUST_DISPOSABLES_REMOVAL_CONFIRM_REQUEST,             &handleAutoEjectRequest },
+    { MSG_ID_FFU_SIGNAL_TD_UPDATE_AVAILABLE,                            &handleUpdateAvailable },
     { MSG_ID_TD_SOFTWARE_RESET_REQUEST,                                 &testTDSoftwareResetRequest },
     { MSG_ID_TD_BUBBLE_OVERRIDE_REQUEST,                                &testBubbleDetectOverride },
     { MSG_ID_TD_BUBBLE_PUBLISH_INTERVAL_OVERRIDE_REQUEST,               &testBubblesDataPublishIntervalOverride },
@@ -625,6 +626,18 @@
 
 /*********************************************************************//**
  * @brief
+ * The resetMicroControllerUnit function resets the MCU.
+ * @details \b Inputs: none
+ * @details \b Outputs: none
+ * @return none
+ *************************************************************************/
+void resetMicroControllerUnit( void )
+{
+    setSystemREG1_SYSECR( (0x2) << 14 );  // Reset processor
+}
+
+/*********************************************************************//**
+ * @brief
  * The sendTestAckResponseMsg function constructs a simple response message
  * for a handled test message and queues it for transmit on the TD=>PC CAN
  * channel.
@@ -693,6 +706,32 @@
 
 /*********************************************************************//**
  * @brief
+ * The handleUpdateAvailable function handles a request from the
+ * Firmware FPGA Updater (FFU) to reset the TD firmware processor.
+ * @note If reset is successful, this function will not return.
+ * @details \b Inputs: none
+ * @details \b Outputs: TD processor soft reset if request is valid
+ * @param message Pointer to the reset request message
+ * @return FALSE if reset command rejected
+ *************************************************************************/
+BOOL handleUpdateAvailable( MESSAGE_T *message )
+{
+    BOOL result = FALSE;
+
+    // Verify payload length
+    if ( 0 == message->hdr.payloadLen )
+    {   // S/w reset of processor
+        result = TRUE;                        // Reset will prevent this from getting transmitted though
+        requestNewOperationMode( MODE_UPDT );
+    }
+
+    sendAckResponseMsg( (MSG_ID_T)message->hdr.msgID, COMM_BUFFER_OUT_CAN_TD_2_UI, result );
+
+    return result;
+}
+
+/*********************************************************************//**
+ * @brief
  * The testTDSoftwareResetRequest function handles a request to reset the
  * TD firmware processor.
  * @note If reset is successful, this function will not return.
@@ -709,7 +748,7 @@
     if ( 0 == message->hdr.payloadLen )
     {   // S/w reset of processor
         result = TRUE;                        // Reset will prevent this from getting transmitted though
-        setSystemREG1_SYSECR( (0x2) << 14 );  // Reset processor
+        resetMicroControllerUnit();
     }
 
     sendTestAckResponseMsg( (MSG_ID_T)message->hdr.msgID, result );