diff --git a/bluetooth/bt_vendor_overlay.conf b/bluetooth/bt_vendor_overlay.conf
index dc30336..37c1900 100644
--- a/bluetooth/bt_vendor_overlay.conf
+++ b/bluetooth/bt_vendor_overlay.conf
@@ -3,6 +3,9 @@
 # Uart port name
 UartPort = /dev/ttySAC18
 
+# Userial type
+UserialType = 2
+
 # <boolean> Enable check whether let aoc controls power pin
 AocPowerPinCtrlCheckEnable = true
 
diff --git a/bluetooth/bt_vendor_overlay_ripcurrent.conf b/bluetooth/bt_vendor_overlay_ripcurrent.conf
index 2473a1b..a4a91d5 100644
--- a/bluetooth/bt_vendor_overlay_ripcurrent.conf
+++ b/bluetooth/bt_vendor_overlay_ripcurrent.conf
@@ -3,6 +3,9 @@
 # Uart port name
 UartPort = /dev/ttySAC18
 
+# Userial type
+UserialType = 2
+
 # Sar backOff high resolution support
 SarBackOffHighResolution = true