diff --git a/common/option.sh b/common/option.sh
index 328e74b..ab0b2c3 100755
--- a/common/option.sh
+++ b/common/option.sh
@@ -56,6 +56,31 @@ else
   $FUNCTION "DOWN"
 fi
 
+ui_print " "
+ui_print " Vol+ = Replace previous config (mandatory for first install)"
+ui_print " "
+ui_print " Vol- = Use previous config"
+ui_print " "
+
+CONFIG_FILE=$MODPATH/system/etc/dnscrypt-proxy/dnscrypt-proxy.toml
+
+if $FUNCTION; then
+  ui_print "Replace old config"
+  ui_print " "
+  cp -af $MODPATH/system/etc/example-dnscrypt-proxy.toml $CONFIG_FILE
+  sed -i -e 's/127.0.0.1:53/127.0.0.1:5354/g' $CONFIG_FILE
+  sed -i -e 's/\[::1\]:53/\[::1\]:5354/g' $CONFIG_FILE
+else
+  if [ -f "$CONFIG_FILE" ]; then
+    ui_print "* Backing up config file"
+    cp $CONFIG_FILE $TMPDIR
+    ui_print "* Restoring config files"
+    cp -af $TMPDIR/dnscrypt-proxy.toml $CONFIG_FILE 
+  else
+    abort "First install have to choose replace mode"
+  fi
+fi
+
 ui_print " "
 ui_print " Vol+ = Auto redirect DNS request with iptables"
 ui_print " "
diff --git a/install.sh b/install.sh
index 6315579..02604d4 100755
--- a/install.sh
+++ b/install.sh
@@ -149,14 +149,8 @@ on_install() {
     BINARY_PATH=$TMPDIR/binary/dnscrypt-proxy-x86_64
   fi
 
-  CONFIG_FILE=$MODPATH/system/etc/dnscrypt-proxy/dnscrypt-proxy.toml
   CONFIG_PATH=$TMPDIR/config
 
-  if [ -f "$CONFIG_FILE" ]; then
-    ui_print "* Backing up config file"
-    cp $CONFIG_FILE $TMPDIR
-  fi
-
   unzip -o "$ZIPFILE" 'config/*' 'binary/*' -d $TMPDIR 2>/dev/null
 
   ui_print "* Creating binary path"
@@ -179,16 +173,6 @@ on_install() {
     abort "Config file is missing!"
   fi
 
-  if [ ! -f "$CONFIG_FILE" ]; then
-    ui_print "* Copying config files"
-    cp -af $CONFIG_PATH/example-dnscrypt-proxy.toml $CONFIG_FILE
-    sed -i -e 's/127.0.0.1:53/127.0.0.1:5354/g' $CONFIG_FILE
-    sed -i -e 's/\[::1\]:53/\[::1\]:5354/g' $CONFIG_FILE
-  else
-    ui_print "* Restoring config files"
-    cp -af $TMPDIR/dnscrypt-proxy.toml $CONFIG_FILE
-  fi
-
   . $TMPDIR/option.sh
 
 }