diff --git a/badges/ajax.php b/badges/ajax.php
deleted file mode 100644
index b3528c56bbf..00000000000
--- a/badges/ajax.php
+++ /dev/null
@@ -1,48 +0,0 @@
-<?php
-// This file is part of Moodle - http://moodle.org/
-//
-// Moodle 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, either version 3 of the License, or
-// (at your option) any later version.
-//
-// Moodle 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 Moodle.  If not, see <http://www.gnu.org/licenses/>.
-
-/**
- * Sends request to check web site availability.
- *
- * @package    core
- * @subpackage badges
- * @copyright  2013 onwards Totara Learning Solutions Ltd {@link http://www.totaralms.com/}
- * @license    http://www.gnu.org/copyleft/gpl.html GNU GPL v3 or later
- * @author     Yuliya Bozhko <yuliya.bozhko@totaralms.com>
- */
-
-define('AJAX_SCRIPT', true);
-
-require_once(__DIR__ . '/../config.php');
-require_once($CFG->libdir . '/badgeslib.php');
-
-require_login();
-$PAGE->set_url('/badges/ajax.php');
-$PAGE->set_context(context_system::instance());
-
-// Unlock session during potentially long curl request.
-\core\session\manager::write_close();
-
-$result = badges_check_backpack_accessibility();
-
-$outcome = new stdClass();
-$outcome->code = $result;
-$outcome->response = get_string('error:backpacknotavailable', 'badges') . $OUTPUT->help_icon('backpackavailability', 'badges');
-
-echo $OUTPUT->header();
-echo json_encode($outcome);
-
-die();
diff --git a/badges/upgrade.txt b/badges/upgrade.txt
index 6d3ecb4173c..9baabf4fa90 100644
--- a/badges/upgrade.txt
+++ b/badges/upgrade.txt
@@ -1,5 +1,13 @@
 This files describes API changes in /badges/*,
 information provided here is intended especially for developers.
+
+=== 4.3 ===
+* The following, deprecated since 3.11, have been removed and can no longer be used:
+ - `badges/ajax.js`
+ - `badges_check_backpack_accessibility`
+ - `badges_setup_backpack_js`
+ - `badges_local_backpack_js`
+
 === 4.0 ===
 * Function print_badge_tabs has been deprecated in favour of manage_badge_action_bar instead
 
diff --git a/lib/badgeslib.php b/lib/badgeslib.php
index 4cd2993cf6f..cd6375bd49a 100644
--- a/lib/badgeslib.php
+++ b/lib/badgeslib.php
@@ -632,20 +632,6 @@ function badges_download($userid) {
     }
 }
 
-/**
- * Checks if badges can be pushed to external backpack.
- *
- * @deprecated Since Moodle 3.11.
- * @return string Code of backpack accessibility status.
- */
-function badges_check_backpack_accessibility() {
-    // This method was used for OBv1.0. It can be deprecated because OBv1.0 support will be removed.
-    // When this method will be removed, badges/ajax.php can be removed too (if it keeps containing only a call to it).
-    debugging('badges_check_backpack_accessibility() can not be used any more, it was only used for OBv1.0', DEBUG_DEVELOPER);
-
-    return 'curl-request-timeout';
-}
-
 /**
  * Checks if user has external backpack connected.
  *
@@ -687,30 +673,6 @@ function badges_handle_course_deletion($courseid) {
     }
 }
 
-/**
- * Loads JS files required for backpack support.
- *
- * @deprecated Since Moodle 3.11.
- * @return void
- */
-function badges_setup_backpack_js() {
-    // This method was used for OBv1.0. It can be deprecated because OBv1.0 support will be removed.
-    debugging('badges_setup_backpack_js() can not be used any more, it was only used for OBv1.0.', DEBUG_DEVELOPER);
-}
-
-/**
- * No js files are required for backpack support.
- * This only exists to directly support the custom V1 backpack api.
- *
- * @deprecated Since Moodle 3.11.
- * @param boolean $checksite Call check site function.
- * @return void
- */
-function badges_local_backpack_js($checksite = false) {
-    // This method was used for OBv1.0. It can be deprecated because OBv1.0 support will be removed.
-    debugging('badges_local_backpack_js() can not be used any more, it was only used for OBv1.0.', DEBUG_DEVELOPER);
-}
-
 /**
  * Create the site backpack with this data.
  *
diff --git a/lib/deprecatedlib.php b/lib/deprecatedlib.php
index bbc64a09e9e..ed03e6ee318 100644
--- a/lib/deprecatedlib.php
+++ b/lib/deprecatedlib.php
@@ -3230,6 +3230,27 @@ function serialise_tool_proxy() {
     throw new coding_exception('serialise_tool_proxy has been removed.');
 }
 
+/**
+ * @deprecated Since Moodle 3.11.
+ */
+function badges_check_backpack_accessibility() {
+    throw new coding_exception('badges_check_backpack_accessibility() can not be used any more, it was only used for OBv1.0');
+}
+
+/**
+ * @deprecated Since Moodle 3.11.
+ */
+function badges_setup_backpack_js() {
+    throw new coding_exception('badges_setup_backpack_js() can not be used any more, it was only used for OBv1.0');
+}
+
+/**
+ * @deprecated Since Moodle 3.11.
+ */
+function badges_local_backpack_js() {
+    throw new coding_exception('badges_local_backpack_js() can not be used any more, it was only used for OBv1.0');
+}
+
 /**
  * Checks if current user is shown any extra fields when listing users.
  *