diff --git a/rw-system.sh b/rw-system.sh
index 83fbdc1..0d64c08 100644
--- a/rw-system.sh
+++ b/rw-system.sh
@@ -690,5 +690,7 @@ if getprop ro.vendor.build.fingerprint |grep -qiE \
 fi
 resetprop service.adb.root 0
 
-#This is for Samsung Galaxy devices with HBM FOD
-echo 319 > /sys/class/lcd/panel/mask_brightness
+# 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