diff --git a/ArduPlane/ReleaseNotes.txt b/ArduPlane/ReleaseNotes.txt
index 8fbec26bd3..583fb4d0b3 100644
--- a/ArduPlane/ReleaseNotes.txt
+++ b/ArduPlane/ReleaseNotes.txt
@@ -1,3 +1,13 @@
+Release 5.0.1 20th Nov 2023
+---------------------------
+Changes since 4.3.8:
+ - AP_BattMonitor: Addition of AD7091R5 ADC I2C Read Driver #23564
+ - AP_Compass: Add in QMC5883P driver #25230
+ - Carbonix PR - AP_BattMonitor: Add in reventech fuel level driver #25219
+ - WIP: Hirth Engine Integration #21805
+ - feature/OV3-1018-enable-ardupilot-apd-implementation-in-hwdef
+ 
+
 Release 4.3.8 24th August 2023
 ------------------------------
 
diff --git a/libraries/AP_HAL_ChibiOS/hwdef/CarbonixF405/hwdef.dat b/libraries/AP_HAL_ChibiOS/hwdef/CarbonixF405/hwdef.dat
index cd8ed70671..e3adad6aba 100644
--- a/libraries/AP_HAL_ChibiOS/hwdef/CarbonixF405/hwdef.dat
+++ b/libraries/AP_HAL_ChibiOS/hwdef/CarbonixF405/hwdef.dat
@@ -145,4 +145,4 @@ COMPASS QMC5883P I2C:0:0x2C false ROTATION_YAW_180
 define HAL_PERIPH_ENABLE_ESC_APD 1
 define APD_ESC_INSTANCES 4
 
-
+define AP_CUSTOM_FIRMWARE_STRING "CxPilot_V5.0.1"
diff --git a/libraries/AP_HAL_ChibiOS/hwdef/CubeOrange/hwdef.dat b/libraries/AP_HAL_ChibiOS/hwdef/CubeOrange/hwdef.dat
index 3ae5a6ecb7..47348868ba 100644
--- a/libraries/AP_HAL_ChibiOS/hwdef/CubeOrange/hwdef.dat
+++ b/libraries/AP_HAL_ChibiOS/hwdef/CubeOrange/hwdef.dat
@@ -4,3 +4,5 @@
 MCU STM32H7xx STM32H743xx
 
 include hwdef.inc
+
+define AP_CUSTOM_FIRMWARE_STRING "CxPilot_V5.0.1"