diff --git a/bluetooth/bt_vendor_overlay.conf b/bluetooth/bt_vendor_overlay.conf
index 82f1e65..765e60f 100644
--- a/bluetooth/bt_vendor_overlay.conf
+++ b/bluetooth/bt_vendor_overlay.conf
@@ -3,9 +3,6 @@
 # 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 a4a91d5..2473a1b 100644
--- a/bluetooth/bt_vendor_overlay_ripcurrent.conf
+++ b/bluetooth/bt_vendor_overlay_ripcurrent.conf
@@ -3,9 +3,6 @@
 # Uart port name
 UartPort = /dev/ttySAC18
 
-# Userial type
-UserialType = 2
-
 # Sar backOff high resolution support
 SarBackOffHighResolution = true