diff --git a/rw-system.sh b/rw-system.sh
index 0d64c08..3b49473 100644
--- a/rw-system.sh
+++ b/rw-system.sh
@@ -693,4 +693,4 @@ resetprop service.adb.root 0
 # This is for Samsung Galaxy devices with HBM FOD
 # On those devices, a magic Layer usageBits switches to "mask_brightness"
 # But default is 255, so set it to max instead
-cat /sys/class/backlight/panel/max_brightness > /sys/class/lcd/panel/mask_brightness
+cat /sys/class/backlight/*/max_brightness |sort -n |tail -n 1 > /sys/class/lcd/panel/mask_brightness