diff --git a/bluetooth/bt_vendor_overlay.conf b/bluetooth/bt_vendor_overlay.conf
index 1f84e6d..318eee5 100644
--- a/bluetooth/bt_vendor_overlay.conf
+++ b/bluetooth/bt_vendor_overlay.conf
@@ -24,3 +24,7 @@ AccelBtDisable = false
 BtHalRecoveryByRestart = true
 
 BtHalBqrEnable = true
+
+# <string> The hardware stage with old chip revision is no longer
+# # supported by BT firmware.
+HwStageWithOldChipFwNoLongerSupport = EVT1.0-PROTO1.0-PROTO1.1