diff --git a/BoardConfigCommon.mk b/BoardConfigCommon.mk
index e8aa712..1abc15b 100644
--- a/BoardConfigCommon.mk
+++ b/BoardConfigCommon.mk
@@ -151,7 +151,6 @@ TARGET_COPY_OUT_VENDOR := vendor
 # Properties
 TARGET_ODM_PROP += $(COMMON_PATH)/odm.prop
 TARGET_PRODUCT_PROP += $(COMMON_PATH)/product.prop
-TARGET_SYSTEM_EXT_PROP += $(COMMON_PATH)/system_ext.prop
 TARGET_SYSTEM_PROP += $(COMMON_PATH)/system.prop
 TARGET_VENDOR_PROP += $(COMMON_PATH)/vendor.prop
 
diff --git a/system_ext.prop b/system_ext.prop
deleted file mode 100644
index 7660375..0000000
--- a/system_ext.prop
+++ /dev/null
@@ -1,2 +0,0 @@
-# Graphics
-persist.demo.hdmirotationlock=false