diff --git a/openwrt/package/base-files/default/etc/init.d/S99done b/openwrt/package/base-files/default/etc/init.d/S99done
index ce6033721..a260ac3d6 100755
--- a/openwrt/package/base-files/default/etc/init.d/S99done
+++ b/openwrt/package/base-files/default/etc/init.d/S99done
@@ -1,4 +1,4 @@
 #!/bin/sh
 # set leds to normal state
-echo "0x00" > /proc/sys/diag
+[ -f /proc/sys/diag ] && echo "0x00" > /proc/sys/diag
 sysctl -p >&-
diff --git a/openwrt/package/base-files/default/etc/preinit b/openwrt/package/base-files/default/etc/preinit
index ff9bb4b10..d64fdaa51 100755
--- a/openwrt/package/base-files/default/etc/preinit
+++ b/openwrt/package/base-files/default/etc/preinit
@@ -3,9 +3,9 @@
 export PATH=/bin:/sbin:/usr/bin:/usr/sbin
 mount none /proc -t proc
 insmod diag
-echo 0x01 > /proc/sys/diag
+[ -f /proc/sys/diag ] && echo 0x01 > /proc/sys/diag
 sleep 1
-if [ ! -f /proc/sys/reset ] || [ $(cat /proc/sys/reset) = 1 -o "$(nvram get failsafe)" = 1 ]; then
+if [ -f /proc/sys/reset ] && [ $(cat /proc/sys/reset) = 1 -o "$(nvram get failsafe)" = 1 ]; then
 	export FAILSAFE=true
 	[ "$(nvram get boot_wait)" != "on" ] && {
 		nvram set boot_wait=on
diff --git a/openwrt/package/base-files/default/sbin/mount_root b/openwrt/package/base-files/default/sbin/mount_root
index ae78ee488..32a6ee548 100755
--- a/openwrt/package/base-files/default/sbin/mount_root
+++ b/openwrt/package/base-files/default/sbin/mount_root
@@ -4,7 +4,7 @@ if [ "$1" != "failsafe" ]; then
 	mount | grep jffs2 >&-
 	if [ $? = 0 ] ; then
 		if [ $(cat /proc/mtd | wc -l) = 6 ]; then
-			echo 5 > /proc/sys/diag
+			[ -f /proc/sys/diag ] && echo 5 > /proc/sys/diag
 			mtd unlock linux
 			mtd erase OpenWrt
 			jffs2root --move