diff --git a/src/main/python/ayab/engine/communication_mock.py b/src/main/python/ayab/engine/communication_mock.py
index 748327c3..337dd820 100644
--- a/src/main/python/ayab/engine/communication_mock.py
+++ b/src/main/python/ayab/engine/communication_mock.py
@@ -67,7 +67,7 @@ def open_serial(self, portname=None) -> bool:
 
     def req_info(self) -> None:
         """Send a request for API version information."""
-        cnfInfo = bytes([Token.cnfInfo.value, 6, 1, 0])  # APIv6, FWv1.0
+        cnfInfo = bytes([Token.cnfInfo.value, 6, 1, 0, 0, 0])  # APIv6, FW v1.0.0
         self.rx_msg_list.append(cnfInfo)
 
     def req_init_API6(self, machine_val):
diff --git a/src/main/python/ayab/engine/control.py b/src/main/python/ayab/engine/control.py
index 260677bd..16aa7c15 100644
--- a/src/main/python/ayab/engine/control.py
+++ b/src/main/python/ayab/engine/control.py
@@ -132,7 +132,9 @@ def __log_cnfInfo(self, msg):
         api = msg[1]
         log = "API v" + str(api)
         if api >= 5:
-            log += ", FW v" + str(msg[2]) + "." + str(msg[3])
+            log += ", FW v" + str(msg[2]) + "." + str(msg[3])  + "." + str(msg[4])
+            if msg[5] is not 0:
+                log += "-dirty"
         self.logger.info(log)
 
     def cnf_line_API6(self, line_number):
diff --git a/src/main/python/ayab/tests/test_communication_mock.py b/src/main/python/ayab/tests/test_communication_mock.py
index 84c3fc76..d15d8681 100644
--- a/src/main/python/ayab/tests/test_communication_mock.py
+++ b/src/main/python/ayab/tests/test_communication_mock.py
@@ -51,7 +51,7 @@ def test_req_start_API6(self):
 
     def test_req_info(self):
         expected_result = (bytes([Token.cnfInfo.value, 6, 1,
-                                  0]), Token.cnfInfo, 6)
+                                  0, 0, 0]), Token.cnfInfo, 6)
         self.comm_dummy.req_info()
         bytes_read = self.comm_dummy.update_API6()
         assert bytes_read == expected_result