diff -up wordpress/wp-admin/includes/admin-filters.php.orig wordpress/wp-admin/includes/admin-filters.php
--- wordpress/wp-admin/includes/admin-filters.php.orig	2015-10-15 00:35:24.000000000 +0200
+++ wordpress/wp-admin/includes/admin-filters.php	2015-12-09 17:08:00.945112230 +0100
@@ -100,7 +100,6 @@ add_action( 'profile_update', 'default_p
 add_action( 'admin_init', 'wp_plugin_update_rows' );
 add_action( 'admin_init', 'wp_theme_update_rows'  );
 
-add_action( 'admin_notices', 'update_nag',      3  );
 add_action( 'admin_notices', 'maintenance_nag', 10 );
 
 add_filter( 'update_footer', 'core_update_footer' );
diff -up wordpress/wp-admin/includes/class-wp-upgrader.php.orig wordpress/wp-admin/includes/class-wp-upgrader.php
--- wordpress/wp-admin/includes/class-wp-upgrader.php.orig	2015-11-16 03:47:25.000000000 +0100
+++ wordpress/wp-admin/includes/class-wp-upgrader.php	2015-12-09 17:09:34.735571806 +0100
@@ -2386,6 +2386,9 @@ class Core_Upgrader extends WP_Upgrader
 			}
 		}
 
+		// RPM: nether allow core update
+		return false;
+
 		// 1: If we're already on that version, not much point in updating?
 		if ( $offered_ver == $wp_version )
 			return false;
@@ -2627,7 +2630,7 @@ class WP_Automatic_Updater {
 	 */
 	public function is_disabled() {
 		// Background updates are disabled if you don't want file changes.
-		if ( defined( 'DISALLOW_FILE_MODS' ) && DISALLOW_FILE_MODS )
+		if ( !defined( 'DISALLOW_FILE_MODS' ) || DISALLOW_FILE_MODS )
 			return true;
 
 		if ( wp_installing() )
diff -up wordpress/wp-admin/includes/update.php.orig wordpress/wp-admin/includes/update.php
--- wordpress/wp-admin/includes/update.php.orig	2015-12-09 17:08:00.946112235 +0100
+++ wordpress/wp-admin/includes/update.php	2015-12-09 17:10:27.642831054 +0100
@@ -251,7 +251,7 @@ function update_right_now_message() {
 		$cur = get_preferred_from_update_core();
 
 		if ( isset( $cur->response ) && $cur->response == 'upgrade' )
-			$msg .= '<a href="' . network_admin_url( 'update-core.php' ) . '" class="button" aria-describedby="wp-version">' . sprintf( __( 'Update to %s' ), $cur->current ? $cur->current : __( 'Latest' ) ) . '</a> ';
+			$msg .= '';
 	}
 
 	/* translators: 1: version number, 2: theme name */
diff -up wordpress/wp-includes/capabilities.php.orig wordpress/wp-includes/capabilities.php
--- wordpress/wp-includes/capabilities.php.orig	2015-11-29 03:27:18.000000000 +0100
+++ wordpress/wp-includes/capabilities.php	2015-12-09 17:08:00.946112235 +0100
@@ -308,7 +308,7 @@ function map_meta_cap( $cap, $user_id )
 		// Disallow the file editors.
 		if ( defined( 'DISALLOW_FILE_EDIT' ) && DISALLOW_FILE_EDIT )
 			$caps[] = 'do_not_allow';
-		elseif ( defined( 'DISALLOW_FILE_MODS' ) && DISALLOW_FILE_MODS )
+		elseif ( !defined( 'DISALLOW_FILE_MODS' ) || DISALLOW_FILE_MODS )
 			$caps[] = 'do_not_allow';
 		elseif ( is_multisite() && ! is_super_admin( $user_id ) )
 			$caps[] = 'do_not_allow';
@@ -326,7 +326,7 @@ function map_meta_cap( $cap, $user_id )
 	case 'update_core':
 		// Disallow anything that creates, deletes, or updates core, plugin, or theme files.
 		// Files in uploads are excepted.
-		if ( defined( 'DISALLOW_FILE_MODS' ) && DISALLOW_FILE_MODS ) {
+		if ( !defined( 'DISALLOW_FILE_MODS' ) || DISALLOW_FILE_MODS ) {
 			$caps[] = 'do_not_allow';
 		} elseif ( is_multisite() && ! is_super_admin( $user_id ) ) {
 			$caps[] = 'do_not_allow';
diff -up wordpress/wp-includes/update.php.orig wordpress/wp-includes/update.php
--- wordpress/wp-includes/update.php.orig	2015-12-06 16:44:27.000000000 +0100
+++ wordpress/wp-includes/update.php	2015-12-09 17:12:09.038327895 +0100
@@ -637,9 +637,6 @@ function _maybe_update_themes() {
  * @since 3.1.0
  */
 function wp_schedule_update_checks() {
-	if ( ! wp_next_scheduled( 'wp_version_check' ) && ! wp_installing() )
-		wp_schedule_event(time(), 'twicedaily', 'wp_version_check');
-
 	if ( ! wp_next_scheduled( 'wp_update_plugins' ) && ! wp_installing() )
 		wp_schedule_event(time(), 'twicedaily', 'wp_update_plugins');
 
@@ -681,8 +678,6 @@ if ( ( ! is_main_site() && ! is_network_
 }
 
 add_action( 'admin_init', '_maybe_update_core' );
-add_action( 'wp_version_check', 'wp_version_check' );
-add_action( 'upgrader_process_complete', 'wp_version_check', 10, 0 );
 
 add_action( 'load-plugins.php', 'wp_update_plugins' );
 add_action( 'load-update.php', 'wp_update_plugins' );