diff --git a/libraries/AP_HAL_ChibiOS/hwdef/Airvolute-DCS2/defaults.parm b/libraries/AP_HAL_ChibiOS/hwdef/Airvolute-DCS2/defaults.parm
new file mode 100644
index 0000000000000..6ffa986988d26
--- /dev/null
+++ b/libraries/AP_HAL_ChibiOS/hwdef/Airvolute-DCS2/defaults.parm
@@ -0,0 +1,4 @@
+SERIAL3_PROTOCOL -1
+NTF_BUZZ_TYPES 0
+NTF_BUZZ_VOLUME 0
+SYSID_THISMAV 2
diff --git a/libraries/AP_HAL_ChibiOS/hwdef/Airvolute-DCS2/hwdef.dat b/libraries/AP_HAL_ChibiOS/hwdef/Airvolute-DCS2/hwdef.dat
index 11d766f8722d7..436868a7acc42 100644
--- a/libraries/AP_HAL_ChibiOS/hwdef/Airvolute-DCS2/hwdef.dat
+++ b/libraries/AP_HAL_ChibiOS/hwdef/Airvolute-DCS2/hwdef.dat
@@ -78,7 +78,6 @@ PD6 USART2_RX USART2
 
 # USART3 (RC INPUT)
 PD9 USART3_RX USART3
-define DEFAULT_SERIAL3_PROTOCOL SerialProtocol_RCIN
 
 #LED RED
 PB1 LED1 OUTPUT HIGH