diff --git a/UpdateRootfs.sh.in b/UpdateRootfs.sh.in
index 89ff561..3e4b29d 100644
--- a/UpdateRootfs.sh.in
+++ b/UpdateRootfs.sh.in
@@ -4,7 +4,7 @@ uuencode=0
 binary=1
 
 ##TAR_PARAMETERS="-C / --exclude=./opt --exclude=./etc/inittab -xzvf -"
-TMP_PATH="/__GfA_Update"
+TMP_PATH="$GFA_PREFIX/__GfA_Update"
 TAR_PARAMETERS="-C $TMP_PATH -xzvf -"
 
 untar_payload ()
@@ -25,6 +25,131 @@ untar_payload ()
 	fi
 }
 
+if [ -z $1 ]
+then
+## prepare for chrooted environment
+chmod +x /bin/bash
+updatename=`realpath $0`
+echo -e "===\n prepare chroot and update script\n===\n"
+(\
+cat << EOF
+#! /bin/bash
+CHROOT=/__GfA_chroot
+
+#---------------------
+recurse ()
+# Param 1 is the nuumber of spaces that the output will be prepended with
+# Param 2 full path to library
+{
+#Use 'readelf -d' to find dependencies
+dependencies=\$(readelf -d \${2} | grep NEEDED | awk '{ print \$5 }' | tr -d '[]')
+for d in \$dependencies; do
+   echo "\${1}\${d} :: \${2}"
+   rsync -lpR \${2} \${CHROOT}
+   if [ -L \${2} ] ; then
+   	LIBNAM=\`readlink -f \${2}\`
+	rsync -lpR \${LIBNAM} \${CHROOT}
+	echo "\${1}-->\${LIBNAM}"
+   fi
+   nm=\${d##*/}
+   #libstdc++ hack for the '+'-s
+   nm1=\${nm//"+"/"\+"}
+   # /lib /lib64 /usr/lib and /usr/lib are searched
+   children=\$(find / -name \${d} 2>/dev/null | grep -E "(^/(lib|lib32|usr/lib|usr/lib32)/\${nm1})")
+   rc=\$?
+   #at least locate... didn't fail
+   if [ \${rc} == "0" ] ; then
+      #we have at least one dependency
+      if [ \${#children[@]} -gt 0 ]; then
+         #check the dependeny's dependencies
+         for c in \$children; do
+          recurse "  \${1}" \${c}
+         done
+      else
+         echo "\${1}no children found"
+      fi
+   else
+      echo "\${1}locate failed for ${d}"
+   fi
+done
+}
+# -- recurse needs 2 params could/should be supplied from cmdline
+echo "==== PREPARE CHROOT ENVIRONMENT in \${CHROOT} ===="
+rm -rf \$CHROOT
+mkdir -p \$CHROOT
+#------------------------------------
+tt=/bin/bash
+echo -e "===\n \$tt\n"
+recurse "" \$tt
+
+tt=/bin/sh
+echo -e "===\n \$tt\n"
+recurse "" \$tt
+
+tt=/bin/busybox
+echo -e "===\n \$tt\n"
+recurse "" \$tt
+
+tt=/usr/sbin/fbset
+echo -e "===\n \$tt\n"
+recurse "" \$tt
+
+tt=/usr/bin/awk
+echo -e "===\n \$tt\n"
+recurse "" \$tt
+
+tt=/usr/bin/cut
+echo -e "===\n \$tt\n"
+recurse "" \$tt
+
+tt=/usr/bin/tail
+echo -e "===\n \$tt\n"
+recurse "" \$tt
+
+tt=/sbin/reboot
+echo -e "===\n \$tt\n"
+recurse "" \$tt
+
+#----------------------------------------
+cp -a /lib/ld-* \${CHROOT}/lib
+cp -a /bin/*  \${CHROOT}/bin
+
+ln -s ./realroot/root \${CHROOT}/root
+
+mkdir -p \${CHROOT}/proc
+mkdir -p \${CHROOT}/dev
+mkdir -p \${CHROOT}/sys
+mkdir -p \${CHROOT}/etc
+mkdir -p \${CHROOT}/realroot
+mkdir -p \${CHROOT}/var
+mkdir -p \${CHROOT}/tmp
+mkdir -p \${CHROOT}/mnt
+
+mkdir -p \${CHROOT}/realroot/media/usb0
+mkdir -p \${CHROOT}/realroot/media/usb1
+
+mount -o bind /proc \${CHROOT}/proc    
+mount -o bind /dev \${CHROOT}/dev
+mount -o bind /sys \${CHROOT}/sys
+mount -o bind /etc \${CHROOT}/etc
+mount -o bind /var \${CHROOT}/var
+mount -o bind /tmp \${CHROOT}/tmp
+mount -o bind / \${CHROOT}/realroot
+
+mount -o bind /media/usb0 \${CHROOT}/realroot/media/usb0
+mount -o bind /media/usb1 \${CHROOT}/realroot/media/usb1
+
+echo -e "\n===========\nchroot environment ready in \n \${CHROOT}\n===========\n"
+chroot \${CHROOT} sh -c 'GFA_PREFIX=/realroot sh /realroot${updatename} DoRealUpdate' 
+
+EOF
+) > /root/GfA_prep_chroot.sh
+
+chmod a+x /root/GfA_prep_chroot.sh
+#--- execute built script
+echo "==>>> execute chroot update script"
+/root/GfA_prep_chroot.sh
+else
 ## --- Kommandos zum Installieren
 ## -- get bootpartition
 such="root=/dev/mmcblk1"
@@ -54,26 +179,26 @@ cp $TMP_PATH/*.dtb /mnt
 
 mkdir -p $TMP_PATH/bu_cfg
 
-if [ -e /etc/network/interfaces ]
+if [ -e $GFA_PREFIX/etc/network/interfaces ]
 then
-        cp /etc/network/interfaces $TMP_PATH/bu_cfg
-        rm /etc/network/interfaces
+        cp $GFA_PREFIX/etc/network/interfaces $TMP_PATH/bu_cfg
+        rm $GFA_PREFIX/etc/network/interfaces
 fi
 
-if [ -e /etc/wpa_supplicant.conf ]
+if [ -e $GFA_PREFIX/etc/wpa_supplicant.conf ]
 then
-        cp /etc/wpa_supplicant.conf $TMP_PATH/bu_cfg/wpa_supplicant.conf_old
-        rm /etc/wpa_supplicant.conf
+        cp $GFA_PREFIX/etc/wpa_supplicant.conf $TMP_PATH/bu_cfg/wpa_supplicant.conf_old
+        rm $GFA_PREFIX/etc/wpa_supplicant.conf
 fi
 
-if [ -e /etc/wpa_supplicant/wpa_supplicant.conf ]
+if [ -e $GFA_PREFIX/etc/wpa_supplicant/wpa_supplicant.conf ]
 then
-        cp /etc/wpa_supplicant/wpa_supplicant.conf $TMP_PATH/bu_cfg
-        rm /etc/wpa_supplicant/wpa_supplicant.conf
+        cp $GFA_PREFIX/etc/wpa_supplicant/wpa_supplicant.conf $TMP_PATH/bu_cfg
+        rm $GFA_PREFIX/etc/wpa_supplicant/wpa_supplicant.conf
 fi
 
 #rootfs auspacken
-tar -C / --exclude=./tmp --exclude=./etc/inittab \
+tar -C $GFA_PREFIX/ --exclude=./tmp --exclude=./etc/inittab \
 	--exclude=./etc/hosts --exclude=./etc/hostname \
 	--exclude=./etc/passwd --exclude=./etc/shadow \
 	--exclude=./etc/vncpwd --exclude=./etc/init.d/S99tincd \
@@ -97,10 +222,10 @@ auto lo
 iface lo inet loopback
 
 EOF
-) > /etc/network/interfaces
+) > $GFA_PREFIX/etc/network/interfaces
 
 awk -v par=$INTERFACE '/^iface/ && $2==par {f=1}/^iface/ && $2!=par {f=0}f && !/^\s*#/d && !/^\s*$/d  {print $0 }' $TMP_PATH/bu_cfg/interfaces \
->> /etc/network/interfaces
+>> $GFA_PREFIX/etc/network/interfaces
 
 (\
 cat << EOF
@@ -114,52 +239,52 @@ iface wlan0 inet dhcp
         wpa-conf /etc/wpa_supplicant/wpa_supplicant.conf
 #
 EOF
-) >> /etc/network/interfaces
+) >> $GFA_PREFIX/etc/network/interfaces
 
-if [ -e /etc/init.d/S98usb_g_ether ]
+if [ -e $GFA_PREFIX/etc/init.d/S98usb_g_ether ]
 then
-	cp /etc/init.d/S98usb_g_ether /etc/init.d/M98usb_g_ether
-	rm /etc/init.d/S98usb_g_ether
+	cp $GFA_PREFIX/etc/init.d/S98usb_g_ether $GFA_PREFIX/etc/init.d/M98usb_g_ether
+	rm $GFA_PREFIX/etc/init.d/S98usb_g_ether
 fi
 
-if [ -e /etc/init.d/S80ti-sgx ]
+if [ -e $GFA_PREFIX/etc/init.d/S80ti-sgx ]
 then
-	rm /etc/init.d/S80ti-sgx
+	rm $GFA_PREFIX/etc/init.d/S80ti-sgx
 fi
         
-if [ -e /etc/init.d/M99_wlan_usb ]
+if [ -e $GFA_PREFIX/etc/init.d/M99_wlan_usb ]
 then
-	rm /etc/init.d/M99_wlan_usb
+	rm $GFA_PREFIX/etc/init.d/M99_wlan_usb
 fi
 
-if [ -e /etc/init.d/S99_wlan_usb ]
+if [ -e $GFA_PREFIX/etc/init.d/S99_wlan_usb ]
 then
-	rm /etc/init.d/S99_wlan_usb
+	rm $GFA_PREFIX/etc/init.d/S99_wlan_usb
 fi
 
-if [ -e /etc/init.d/M80dhcp-relay ]
+if [ -e $GFA_PREFIX/etc/init.d/M80dhcp-relay ]
 then
-	rm /etc/init.d/M80dhcp-relay
+	rm $GFA_PREFIX/etc/init.d/M80dhcp-relay
 fi
 
-if [ -e /etc/init.d/S80dhcp-relay ]
+if [ -e $GFA_PREFIX/etc/init.d/S80dhcp-relay ]
 then
-	rm /etc/init.d/S80dhcp-relay
+	rm $GFA_PREFIX/etc/init.d/S80dhcp-relay
 fi
 
-if [ -e /etc/init.d/M80dhcp-server ]
+if [ -e $GFA_PREFIX/etc/init.d/M80dhcp-server ]
 then
-	rm /etc/init.d/M80dhcp-server
+	rm $GFA_PREFIX/etc/init.d/M80dhcp-server
 fi
 
-if [ -e /etc/init.d/S80dhcp-server ]
+if [ -e $GFA_PREFIX/etc/init.d/S80dhcp-server ]
 then
-	rm /etc/init.d/S80dhcp-server
+	rm $GFA_PREFIX/etc/init.d/S80dhcp-server
 fi
 
-if [ -d /etc/dhcp ]
+if [ -d $GFA_PREFIX/etc/dhcp ]
 then
-	rm -rf /etc/dhcp
+	rm -rf $GFA_PREFIX/etc/dhcp
 fi
 
 #echo "Update Firmware"
@@ -170,7 +295,7 @@ fi
 #/root/gfa_spi -v
 #================================
 #--create mountable run folder insted of link
-RUNDIR=/run
+RUNDIR=$GFA_PREFIX/run
 if [ -L $RUNDIR ]; then
   mv $RUNDIR $RUNDIR'_WRK'
   mkdir $RUNDIR
@@ -182,28 +307,29 @@ if [ -L $RUNDIR ]; then
   rm $RUNDIR'_WRK' 
 fi
 #--- craete missing nogroup group
-GID_NOGROUP=`awk -F\: '/nogroup/ {print $3}' /etc/group`
+GID_NOGROUP=`awk -F\: '/nogroup/ {print $3}' $GFA_PREFIX/etc/group`
 if [ -z "$GID_NOGROUP" ]; then
-  addgroup -S -g 65534 nogroup
+#  addgroup -S -g 65534 nogroup
+  echo "nogroup:x:65534:" >> $GFA_PREFIX/etc/group
 fi
 #--create missing users for mysql,
-if [ -z `awk -F\: '/mysql/ {print $3}' /etc/passwd` ]; then
-  UID_MY=`awk -F: '{uid[$3]=1}END{for(x=1000; x<=1500; x++) {if(uid[x] != ""){}else{print x; exit;}}}' /etc/passwd`
-  echo "mysql:x:$UID_MY:65534:MySQL daemon:/var/mysql:/bin/false" >> /etc/passwd
+if [ -z `awk -F\: '/mysql/ {print $3}' $GFA_PREFIX/etc/passwd` ]; then
+  UID_MY=`awk -F: '{uid[$3]=1}END{for(x=1000; x<=1500; x++) {if(uid[x] != ""){}else{print x; exit;}}}' $GFA_PREFIX/etc/passwd`
+  echo "mysql:x:$UID_MY:65534:MySQL daemon:/var/mysql:/bin/false" >> $GFA_PREFIX/etc/passwd
 fi
 #--create missing users for postgresql,
-if [ -z `awk -F\: '/postgres/ {print $3}' /etc/passwd` ]; then
-  UID_PG=`awk -F: '{uid[$3]=1}END{for(x=1000; x<=1500; x++) {if(uid[x] != ""){}else{print x; exit;}}}' /etc/passwd`
-  GID_PG=`awk -F\: '/postgres/ {print $3}' /etc/group`
+if [ -z `awk -F\: '/postgres/ {print $3}' $GFA_PREFIX/etc/passwd` ]; then
+  UID_PG=`awk -F: '{uid[$3]=1}END{for(x=1000; x<=1500; x++) {if(uid[x] != ""){}else{print x; exit;}}}' $GFA_PREFIX/etc/passwd`
+  GID_PG=`awk -F\: '/postgres/ {print $3}' $GFA_PREFIX/etc/group`
   if [ -z "$GID_PG" ]; then
-    GID_PG=`awk -F: '{uid[$3]=1}END{for(x=1000; x<=1500; x++) {if(uid[x] != ""){}else{print x; exit;}}}' /etc/group`
-    echo "postgres:x:$GID_PG:" >> /etc/group
+    GID_PG=`awk -F: '{uid[$3]=1}END{for(x=1000; x<=1500; x++) {if(uid[x] != ""){}else{print x; exit;}}}' $GFA_PREFIX/etc/group`
+    echo "postgres:x:$GID_PG:" >> $GFA_PREFIX/etc/group
     fi
-  echo "postgres:x:$UID_PG:$GID_PG:PostgreSQL Server:/var/lib/pgsql:/bin/sh" >> /etc/passwd
+  echo "postgres:x:$UID_PG:$GID_PG:PostgreSQL Server:/var/lib/pgsql:/bin/sh" >> $GFA_PREFIX/etc/passwd
 fi
 #------------------
-chown -Rv mysql:nogroup /var/mysql
-chown -Rv postgres:postgres /var/lib/pgsql
+chown -Rv mysql:nogroup $GFA_PREFIX/var/mysql
+chown -Rv postgres:postgres $GFA_PREFIX/var/lib/pgsql
 #==============================================================================
 # Get Graphics resolution and set dtb to the right resolution
 BASEBOARD=`cat /tmp/BASEBOARD`
@@ -288,4 +414,11 @@ fi
 echo "Update Done, pls. reboot System"
 umount /mnt
 echo "."
+echo "restart system !!!"
+sleep 2
+#-----------------
+reboot
+exit 0
+fi
+#-------------
 exit 0