diff --git a/bluetooth/bt_vendor_overlay.conf b/bluetooth/bt_vendor_overlay.conf
index 37c1900..82f1e65 100644
--- a/bluetooth/bt_vendor_overlay.conf
+++ b/bluetooth/bt_vendor_overlay.conf
@@ -13,6 +13,10 @@ AocPowerPinCtrlCheckEnable = true
 # This only affects when AocPowerPinCtrlCheckEnable is true
 HwStageDoesNotCtrlPowerPinFromAoc = PROTO1.0-EVT1.0-EVT1.2
 
+# <string> The hardware stage with old chip revision is no longer
+# supported by BT firmware.
+HwStageWithOldChipFwNoLongerSupport = PROTO1.0-PROTO1.1
+
 # Sar backOff high resolution support
 SarBackOffHighResolution = true