diff --git a/install/upgrade_1.6.2.php b/install/upgrade_1.6.2.php
index 9f4a72d5d..3117762ee 100644
--- a/install/upgrade_1.6.2.php
+++ b/install/upgrade_1.6.2.php
@@ -343,5 +343,5 @@ WHERE
 pwg_query($query);
 
 // now we upgrade from 1.7.0
-// include_once(PHPWG_ROOT_PATH.'install/upgrade_1.7.0.php');
+include_once(PHPWG_ROOT_PATH.'install/upgrade_1.7.0.php');
 ?>
diff --git a/install/upgrade_1.7.0.php b/install/upgrade_1.7.0.php
new file mode 100644
index 000000000..85533dcfa
--- /dev/null
+++ b/install/upgrade_1.7.0.php
@@ -0,0 +1,118 @@
+<?php
+// +-----------------------------------------------------------------------+
+// | Piwigo - a PHP based picture gallery                                  |
+// +-----------------------------------------------------------------------+
+// | Copyright(C) 2008      Piwigo Team                  http://piwigo.org |
+// | Copyright(C) 2003-2008 PhpWebGallery Team    http://phpwebgallery.net |
+// | Copyright(C) 2002-2003 Pierrick LE GALL   http://le-gall.net/pierrick |
+// +-----------------------------------------------------------------------+
+// | This program is free software; you can redistribute it and/or modify  |
+// | it under the terms of the GNU General Public License as published by  |
+// | the Free Software Foundation                                          |
+// |                                                                       |
+// | This program is distributed in the hope that it will be useful, but   |
+// | WITHOUT ANY WARRANTY; without even the implied warranty of            |
+// | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU      |
+// | General Public License for more details.                              |
+// |                                                                       |
+// | You should have received a copy of the GNU General Public License     |
+// | along with this program; if not, write to the Free Software           |
+// | Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, |
+// | USA.                                                                  |
+// +-----------------------------------------------------------------------+
+
+if (!defined('PHPWG_ROOT_PATH'))
+{
+  die ('This page cannot be loaded directly, load upgrade.php');
+}
+else
+{
+  if (!defined('PHPWG_IN_UPGRADE') or !PHPWG_IN_UPGRADE)
+  {
+    die ('Hacking attempt!');
+  }
+}
+
+define('PREFIX_TABLE', $prefixeTable);
+define('UPGRADES_PATH', PHPWG_ROOT_PATH.'install/db');
+
+list($dbnow) = mysql_fetch_row(pwg_query('SELECT NOW();'));
+define('CURRENT_DATE', $dbnow);
+
+// +-----------------------------------------------------------------------+
+// |             Fill upgrade table without applying upgrade               |
+// +-----------------------------------------------------------------------+
+
+// retrieve already applied upgrades
+$query = '
+SELECT id
+  FROM '.PREFIX_TABLE.'upgrade
+;';
+$applied = array_from_query($query, 'id');
+
+// retrieve existing upgrades
+$existing = get_available_upgrade_ids();
+
+// which upgrades need to be applied?
+$to_apply = array_diff($existing, $applied);
+$inserts = array();
+foreach ($to_apply as $upgrade_id)
+{
+  if ($upgrade_id > 60)
+  {
+    break;
+  }
+  
+  array_push(
+    $inserts,
+    array(
+      'id' => $upgrade_id,
+      'applied' => CURRENT_DATE,
+      'description' => '[migration from 1.7.0 to '.RELEASE.'] not applied',
+      )
+    );
+}
+mass_inserts(
+  '`'.UPGRADE_TABLE.'`',
+  array_keys($inserts[0]),
+  $inserts
+  );
+
+// +-----------------------------------------------------------------------+
+// |                          Perform upgrades                             |
+// +-----------------------------------------------------------------------+
+
+echo '<pre>';
+
+for ($upgrade_id = 61; ; $upgrade_id++)
+{
+  if (!file_exists(UPGRADES_PATH.'/'.$upgrade_id.'-database.php'))
+  {
+    break;
+  }
+  
+  unset($upgrade_description);
+
+  echo "\n\n";
+  echo '=== upgrade '.$upgrade_id."\n";
+
+  // include & execute upgrade script. Each upgrade script must contain
+  // $upgrade_description variable which describe briefly what the upgrade
+  // script does.
+  include(UPGRADES_PATH.'/'.$upgrade_id.'-database.php');
+
+  // notify upgrade
+  $query = '
+INSERT INTO `'.PREFIX_TABLE.'upgrade`
+  (id, applied, description)
+  VALUES
+  (\''.$upgrade_id.'\', NOW(), \'[migration from 1.7.0 to '.RELEASE.'] '.$upgrade_description.'\')
+;';
+  pwg_query($query);
+}
+
+echo '</pre>';
+
+// now we upgrade from 2.0.0
+// include_once(PHPWG_ROOT_PATH.'install/upgrade_2.0.0.php');
+?>
diff --git a/upgrade.php b/upgrade.php
index 0c324d10a..67640635f 100644
--- a/upgrade.php
+++ b/upgrade.php
@@ -196,6 +196,10 @@ if (!isset($_GET['version']))
       $current_release = '1.6.2';
     }
   }
+  else if (!in_array('md5sum', $columns_of[PREFIX_TABLE.'images']))
+  {
+    $current_release = '1.7.0';
+  }
   else
   {
     die('No upgrade required, the database structure is up to date');
@@ -217,7 +221,7 @@ if (!isset($_GET['version']))
 
 else
 {
-  if (in_array(PREFIX_TABLE.'history_summary', $tables))
+  if (in_array('md5sum', $columns_of[PREFIX_TABLE.'images']))
   {
     die('No database upgrade required, do not refresh the page');
   }
@@ -230,29 +234,6 @@ else
     $conf['die_on_sql_error'] = false;
     include($upgrade_file);
 
-    // Available upgrades must be ignored after a fresh installation. To
-    // make PWG avoid upgrading, we must tell it upgrades have already been
-    // made.
-    list($dbnow) = mysql_fetch_row(pwg_query('SELECT NOW();'));
-    define('CURRENT_DATE', $dbnow);
-    $datas = array();
-    foreach (get_available_upgrade_ids() as $upgrade_id)
-    {
-      array_push(
-        $datas,
-        array(
-          'id'          => $upgrade_id,
-          'applied'     => CURRENT_DATE,
-          'description' => 'upgrade included in migration',
-          )
-        );
-    }
-    mass_inserts(
-      UPGRADE_TABLE,
-      array_keys($datas[0]),
-      $datas
-      );
-
     // Create empty local files to avoid log errors
     create_empty_local_files();
 
@@ -298,18 +279,7 @@ if you encounter any problem.'
 
     $template->assign('infos', $page['infos']);
 
-    $query = '
-UPDATE '.USER_CACHE_TABLE.'
-  SET need_update = \'true\'
-;';
-
-    pwg_query($query);
-    $query = '
-REPLACE INTO '.PLUGINS_TABLE.'
-  (id, state)
-  VALUES (\'c13y_upgrade\', \'active\')
-;';
-    pwg_query($query);
+    invalidate_user_cache();
   }
   else
   {