Index: wp-admin/includes/class-wp-upgrader.php
===================================================================
--- wp-admin/includes/class-wp-upgrader.php	(revision 12549)
+++ wp-admin/includes/class-wp-upgrader.php	(working copy)
@@ -781,13 +781,7 @@
 		if ( is_wp_error($working_dir) )
 			return $working_dir;
 
-		// Copy update-core.php from the new version into place.
-		if ( !$wp_filesystem->copy($working_dir . '/wordpress/wp-admin/includes/update-core.php', $wp_dir . 'wp-admin/includes/update-core.php', true) ) {
-			$wp_filesystem->delete($working_dir, true);
-			return new WP_Error('copy_failed', $this->strings['copy_failed']);
-		}
-		$wp_filesystem->chmod($wp_dir . 'wp-admin/includes/update-core.php', FS_CHMOD_FILE);
-
+		$wp_filesystem->delete($working_dir . '/wordpress/wp-admin/includes/update-core.php');
 		require(ABSPATH . 'wp-admin/includes/update-core.php');
 
 		return update_core($working_dir, $wp_dir);
Index: wp-includes/wp-db.php
===================================================================
--- wp-includes/wp-db.php	(revision 12549)
+++ wp-includes/wp-db.php	(working copy)
@@ -1127,6 +1127,7 @@
 	 * @return false|string false on failure, version number on success
 	 */
 	function db_version() {
+		return '4.1.1';
 		return preg_replace('/[^0-9.].*/', '', mysql_get_server_info( $this->dbh ));
 	}
 }