diff --git a/data/scripts/install.sh b/data/scripts/install.sh
index 277f305bc..537da3cf9 100755
--- a/data/scripts/install.sh
+++ b/data/scripts/install.sh
@@ -1,11 +1,45 @@
 #!/bin/sh
 # 1st arg is dir where unpack, $2 file to be installed
+update_file() 
+{
+
+	FILE_IMAGE=$1
+	FILE_NEW=$2
+	MD5NEW=`md5sum $FILE_NEW | cut -d " " -f1`
+	if [ -e $FILE_IMAGE ]; then
+		MD5IMG=`md5sum $FILE_IMAGE | cut -d " " -f1`
+	else
+		MD5IMG=0
+	fi
+
+	if [ "$MD5NEW" = "$MD5IMG" ] 
+	then
+		echo "New and old File $FILE_IMAGE identical"
+	else
+		echo "update $FILE_IMAGE"
+		rm -f $FILE_IMAGE
+		cp $FILE_NEW $FILE_IMAGE
+	fi
+}
 
 cd $1
 tar zxvf $2
 ./temp_inst/ctrl/preinstall.sh $PWD
-cp -a ./temp_inst/inst/* /
+
+PAT=$1/temp_inst/inst
+len_a=${#PAT}
+
+find $PAT  | while read i ;do
+	if [ -d "$i" ] || [ $(basename "$i") == "boot.bmp.gz" ] || [ $(basename "$i") == "uImage" ];then 
+		continue
+	fi
+
+	NEW_F=$i
+	len_b=${#NEW_F}
+	OLD_F=$(echo ${NEW_F:$len_a:$len_b})
+	update_file $OLD_F $NEW_F
+done
+
 ./temp_inst/ctrl/postinstall.sh $PWD
 rm -rf temp_inst
 exit 0
-