diff --git a/bluetooth/bt_vendor_overlay.conf b/bluetooth/bt_vendor_overlay.conf
index 0b1c80f..f38c753 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
+
 # Sar backOff high resolution support
 SarBackOffHighResolution = true
 
diff --git a/bluetooth/bt_vendor_overlay_ripcurrent.conf b/bluetooth/bt_vendor_overlay_ripcurrent.conf
index edf5f27..c89dbb5 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