diff --git a/lesson-45-nucleo/TimeBomb.qm b/lesson-45-nucleo/TimeBomb.qm
index 35c516a..ea8d962 100644
--- a/lesson-45-nucleo/TimeBomb.qm
+++ b/lesson-45-nucleo/TimeBomb.qm
@@ -1,5 +1,5 @@
 <?xml version="1.0" encoding="UTF-8"?>
-<model version="5.2.1" links="1">
+<model version="5.2.2" links="1">
  <documentation>About this model:
 -----------------
 The TimeBomb example from the video course &quot;Modern Embedded Systems Programming&quot;:
diff --git a/lesson-45-nucleo/main.c b/lesson-45-nucleo/main.c
index 663e9f2..3e86b9d 100644
--- a/lesson-45-nucleo/main.c
+++ b/lesson-45-nucleo/main.c
@@ -3,7 +3,7 @@
 * Model: TimeBomb.qm
 * File:  ${.::main.c}
 *
-* This code has been generated by QM 5.2.1 <www.state-machine.com/qm>.
+* This code has been generated by QM 5.2.2 <www.state-machine.com/qm>.
 * DO NOT EDIT THIS FILE MANUALLY. All your changes will be lost.
 *
 * SPDX-License-Identifier: GPL-3.0-or-later
diff --git a/lesson-45/TimeBomb.qm b/lesson-45/TimeBomb.qm
index 35c516a..573d246 100644
--- a/lesson-45/TimeBomb.qm
+++ b/lesson-45/TimeBomb.qm
@@ -1,5 +1,5 @@
 <?xml version="1.0" encoding="UTF-8"?>
-<model version="5.2.1" links="1">
+<model version="5.2.2" links="1">
  <documentation>About this model:
 -----------------
 The TimeBomb example from the video course &quot;Modern Embedded Systems Programming&quot;:
@@ -134,7 +134,8 @@ QTimeEvt_armX(&amp;me-&gt;te, BSP_TICKS_PER_SEC/2, 0U);</entry>
      <state name="boom">
       <entry brief="all-LEDs=ON;">BSP_ledRedOn();
 BSP_ledGreenOn();
-BSP_ledBlueOn();</entry>
+BSP_ledBlueOn();
+MY_PRINTF(&quot;*** Boom!!!\n&quot;);</entry>
       <state_glyph node="4,68,26,10">
        <entry box="1,2,17,3"/>
       </state_glyph>
@@ -155,6 +156,8 @@ BSP_ledBlueOn();</entry>
 #include &quot;qpc.h&quot;  /* QP/C API */
 #include &quot;bsp.h&quot;
 
+#include &quot;my_printf.h&quot; /* software tracing with printf() */
+
 Q_DEFINE_THIS_MODULE(&quot;main&quot;) /* this module name for Q_ASSERT() */
 
 /* The TimeBomb AO =======================================================*/
@@ -183,8 +186,7 @@ int main() {
 
     QF_run(); /* run QP/C... */
     return 0; /* NOTE: the scheduler does NOT return */
-}
-</text>
+}</text>
   </file>
  </directory>
 </model>
diff --git a/lesson-45/main.c b/lesson-45/main.c
index ddc38dc..d8b1b84 100644
--- a/lesson-45/main.c
+++ b/lesson-45/main.c
@@ -3,7 +3,7 @@
 * Model: TimeBomb.qm
 * File:  ${.::main.c}
 *
-* This code has been generated by QM 5.2.1 <www.state-machine.com/qm>.
+* This code has been generated by QM 5.2.2 <www.state-machine.com/qm>.
 * DO NOT EDIT THIS FILE MANUALLY. All your changes will be lost.
 *
 * SPDX-License-Identifier: GPL-3.0-or-later
@@ -279,4 +279,3 @@ int main() {
     QF_run(); /* run QP/C... */
     return 0; /* NOTE: the scheduler does NOT return */
 }
-