Index: dialin/ui/hd_simulator.py
===================================================================
diff -u -rcc91c2c209113ec2783086ed8570f0895f97ae43 -r5765847ef494dcf138dbbbcd04f2fde0d2010d7d
--- dialin/ui/hd_simulator.py	(.../hd_simulator.py)	(revision cc91c2c209113ec2783086ed8570f0895f97ae43)
+++ dialin/ui/hd_simulator.py	(.../hd_simulator.py)	(revision 5765847ef494dcf138dbbbcd04f2fde0d2010d7d)
@@ -645,6 +645,12 @@
                 rsp_payload += integer_to_bytearray(RequestRejectReasons.REQUEST_REJECT_REASON_NONE.value)
                 self.demoCount = 0  # immediately
 
+            elif msg_id == MsgIds.MSG_ID_UI_SERVICE_MODE_REQUEST:               # 0xB0
+                rsp_id = MsgIds.MSG_ID_HD_RESPONSE_SERVICE_MODE_REQUEST
+                rsp_payload = integer_to_bytearray(EResponse.Accepted)
+                rsp_payload += integer_to_bytearray(RequestRejectReasons.REQUEST_REJECT_REASON_NONE.value)
+                self.demoCount = 0  # immediately
+
             #
             # --------------------------------------------------
             # Send Response if needed