diff --git a/SD_ROOT/wz_mini/bin/upgrade-run.sh b/SD_ROOT/wz_mini/bin/upgrade-run.sh
index a96d983..b964d40 100755
--- a/SD_ROOT/wz_mini/bin/upgrade-run.sh
+++ b/SD_ROOT/wz_mini/bin/upgrade-run.sh
@@ -1,5 +1,12 @@
 #!/bin/sh
 
+if df / | grep -q overlayfs; then
+	echo "Unable to upgrade because rootfs is overlay"
+	echo "Please disable rootfs overlay by setting ENABLE_OVERLAY_IMAGE=\"false\" in wz_mini.conf and reboot first"
+ 	echo "You can change it back after upgrade is finished"
+	exit 1
+fi
+
 if [ -L /dev/fd ]; then
 	echo "fd exists" > /dev/null
 else