diff --git a/ajax/adblock/update_blocklist.php b/ajax/adblock/update_blocklist.php
index f21ed4cd..458369ab 100644
--- a/ajax/adblock/update_blocklist.php
+++ b/ajax/adblock/update_blocklist.php
@@ -5,50 +5,57 @@ require_once '../../includes/session.php';
 require_once '../../includes/config.php';
 require_once '../../includes/authenticate.php';
 
+define('BLOCKLISTS_FILE', __DIR__ . '/../../config/blocklists.json');
+
 if (isset($_POST['blocklist_id'])) {
-    $blocklist_id = escapeshellcmd($_POST['blocklist_id']);
+    $blocklist_id = $_POST['blocklist_id'];
+    $json = file_get_contents(BLOCKLISTS_FILE);
+    $allLists = json_decode($json, true);
 
-    switch ($blocklist_id) {
-    case "StevenBlack/hosts \(default\)":
-        $list_url = "https://raw.githubusercontent.com/StevenBlack/hosts/master/hosts";
-        $dest_file = "hostnames.txt";
-        break;
-    case "badmojr/1Hosts \(Mini\)":
-        $list_url = "https://badmojr.github.io/1Hosts/mini/hosts.txt";
-        $dest_file = "hostnames.txt";
-        break;
-    case "badmojr/1Hosts \(Lite\)":
-        $list_url = "https://badmojr.github.io/1Hosts/Lite/hosts.txt";
-        $dest_file = "hostnames.txt";
-        break;
-    case "badmojr/1Hosts \(Pro\)":
-        $list_url = "https://badmojr.github.io/1Hosts/Pro/hosts.txt";
-        $dest_file = "hostnames.txt";
-        break;
-    case "badmojr/1Hosts \(Xtra\)":
-        $list_url = "https://badmojr.github.io/1Hosts/Xtra/hosts.txt";
-        $dest_file = "hostnames.txt";
-        break;
-    case "oisd/big \(default\)":
-        $list_url = "https://big.oisd.nl/dnsmasq";
-        $dest_file = "domains.txt";
-        break;
-    case "oisd/small":
-        $list_url = "https://small.oisd.nl/dnsmasq";
-        $dest_file = "domains.txt";
-        break;
-    case "oisd/nsfw":
-        $list_url = "https://nsfw.oisd.nl/dnsmasq";
-        $dest_file = "domains.txt";
-        break;
+    if ($allLists === null) {
+        echo json_encode([
+            'return' => 3,
+            'output' => ['Failed to parse blocklists.json']
+        ]);
+        exit;
     }
-    $blocklist = $list_url . $dest_file;
-    $dest = substr($dest_file, 0, strrpos($dest_file, "."));
+    $flatList = flattenList($allLists);
+
+    if (!isset($flatList[$blocklist_id])) {
+        echo json_encode(['return' => 1, 'output' => ['Invalid blocklist ID']]);
+        exit;
+    }
+
+    $list_url = escapeshellcmd($flatList[$blocklist_id]['list_url']);
+    $dest_file = escapeshellcmd($flatList[$blocklist_id]['dest_file']);
+    $dest = pathinfo($dest_file, PATHINFO_FILENAME);
+    $scriptPath = RASPI_CONFIG . '/adblock/update_blocklist.sh';
+
+    if (!file_exists($scriptPath)) {
+        echo json_encode([
+            'return' => 5,
+            'output' => ["Update script not found: $scriptPath"]
+        ]);
+        exit;
+    }
+    exec("sudo $scriptPath $list_url $dest_file " . RASPI_ADBLOCK_LISTPATH, $output, $return_var);
+    echo json_encode([
+        'return' => $return_var,
+        'output' => $output,
+        'list' => $dest
+    ]);
 
-    exec("sudo /etc/raspap/adblock/update_blocklist.sh $list_url $dest_file " .RASPI_ADBLOCK_LISTPATH, $return);
-    $jsonData = ['return'=>$return,'list'=>$dest];
-    echo json_encode($jsonData);
 } else {
-    $jsonData = ['return'=>2,'output'=>['Error getting data']];
-    echo json_encode($jsonData);
+    echo json_encode(['return' => 2, 'output' => ['No blocklist ID provided']]);
 }
+
+function flattenList(array $grouped): array {
+    $flat = [];
+    foreach ($grouped as $group) {
+        foreach ($group as $name => $meta) {
+            $flat[$name] = $meta;
+        }
+    }
+    return $flat;
+}
+
diff --git a/app/js/custom.js b/app/js/custom.js
index d95b5405..3e8a7c58 100644
--- a/app/js/custom.js
+++ b/app/js/custom.js
@@ -730,20 +730,65 @@ function setHardwareModeTooltip() {
  * Interface elements are updated to indicate current progress, status.
  */
 function updateBlocklist() {
-    var opt = $('#cbxblocklist option:selected');
-    var blocklist_id = opt.val();
-    var csrfToken = $('meta[name=csrf_token]').attr('content');
-    if (blocklist_id == '') { return; }
-    $('#cbxblocklist-status').find('i').removeClass('fas fa-check').addClass('fas fa-cog fa-spin');
-    $('#cbxblocklist-status').removeClass('check-hidden').addClass('check-progress');
-    $.post('ajax/adblock/update_blocklist.php',{ 'blocklist_id':blocklist_id, 'csrf_token': csrfToken},function(data){
-        var jsonData = JSON.parse(data);
-        if (jsonData['return'] == '0') {
-            $('#cbxblocklist-status').find('i').removeClass('fas fa-cog fa-spin').addClass('fas fa-check');
-            $('#cbxblocklist-status').removeClass('check-progress').addClass('check-updated').delay(500).animate({ opacity: 1 }, 700);
-            $('#blocklist-'+jsonData['list']).text("Just now");
+    const opt = $('#cbxblocklist option:selected');
+    const blocklist_id = opt.val();
+    const csrfToken = $('meta[name=csrf_token]').attr('content');
+
+    if (blocklist_id === '') return;
+
+    const statusIcon = $('#cbxblocklist-status').find('i');
+    const statusWrapper = $('#cbxblocklist-status');
+
+    statusIcon.removeClass('fa-check fa-exclamation-triangle').addClass('fa-cog fa-spin');
+    statusWrapper.removeClass('check-hidden check-error check-updated').addClass('check-progress');
+
+    $.post('ajax/adblock/update_blocklist.php', {
+        'blocklist_id': blocklist_id,
+        'csrf_token': csrfToken
+    }, function (data) {
+        let jsonData;
+        try {
+            jsonData = JSON.parse(data);
+        } catch (e) {
+            showError("Unexpected server response.");
+            return;
         }
-    })
+        const resultCode = jsonData['return'];
+        const output = jsonData['output']?.join('\n') || '';
+
+        switch (resultCode) {
+            case 0:
+                statusIcon.removeClass('fa-cog fa-spin').addClass('fa-check');
+                statusWrapper.removeClass('check-progress').addClass('check-updated').delay(500).animate({ opacity: 1 }, 700);
+                $('#blocklist-' + jsonData['list']).text("Just now");
+                break;
+            case 1:
+                showError("Invalid blocklist.");
+                break;
+            case 2:
+                showError("No blocklist provided.");
+                break;
+            case 3:
+                showError("Could not parse blocklists.json.");
+                break;
+            case 4:
+                showError("blocklists.json file not found.");
+                break;
+            case 5:
+                showError("Update script not found.");
+                break;
+            default:
+                showError("Unknown error occurred.");
+        }
+    }).fail(function (jqXHR, textStatus, errorThrown) {
+        showError(`AJAX request failed: ${textStatus}`);
+    });
+
+    function showError(message) {
+        statusIcon.removeClass('fa-cog fa-spin').addClass('fa-exclamation-triangle');
+        statusWrapper.removeClass('check-progress').addClass('check-error');
+        alert("Blocklist update failed:\n\n" + message);
+    }
 }
 
 function clearBlocklistStatus() {
diff --git a/config/blocklists.json b/config/blocklists.json
index 7138c451..1a3a5e45 100644
--- a/config/blocklists.json
+++ b/config/blocklists.json
@@ -1,17 +1,45 @@
 {
-    "StevenBlack/hosts": [
-        "StevenBlack/hosts (default)"
-    ],
-    "badmojr/hosts": [
-        "badmojr/1Hosts (Mini)",
-        "badmojr/1Hosts (Lite)",
-        "badmojr/1Hosts (Pro)",
-        "badmojr/1Hosts (Xtra)"
-    ],
-    "OISD/domains": [
-        "oisd/big (default)",
-        "oisd/small",
-        "oisd/nsfw"
-    ]
+  "StevenBlack/hosts": {
+    "StevenBlack/hosts (default)": {
+      "list_url": "https://raw.githubusercontent.com/StevenBlack/hosts/master/hosts",
+      "dest_file": "hostnames.txt"
+    }
+  },
+  "HaGeZi/hosts": {
+    "hagezi/hosts (Light)": {
+      "list_url": "https://raw.githubusercontent.com/hagezi/dns-blocklists/main/hosts/light.txt",
+      "dest_file": "hostnames.txt"
+    },
+    "hagezi/hosts (Normal)": {
+      "list_url": "https://raw.githubusercontent.com/hagezi/dns-blocklists/main/hosts/multi.txt",
+      "dest_file": "hostnames.txt"
+    },
+    "hagezi/hosts (Pro)": {
+      "list_url": "https://raw.githubusercontent.com/hagezi/dns-blocklists/main/hosts/pro.txt",
+      "dest_file": "hostnames.txt"
+    },
+    "hagezi/hosts (Pro++)": {
+      "list_url": "https://raw.githubusercontent.com/hagezi/dns-blocklists/main/hosts/pro.plus.txt",
+      "dest_file": "hostnames.txt"
+    },
+    "hagezi/hosts (Ultimate)": {
+      "list_url": "https://raw.githubusercontent.com/hagezi/dns-blocklists/main/hosts/ultimate.txt",
+      "dest_file": "hostnames.txt"
+    }
+  },
+  "OISD/domains": {
+    "oisd/big (default)": {
+      "list_url": "https://big.oisd.nl/dnsmasq",
+      "dest_file": "domains.txt"
+    },
+    "oisd/small": {
+      "list_url": "https://small.oisd.nl/dnsmasq",
+      "dest_file": "domains.txt"
+    },
+    "oisd/nsfw": {
+      "list_url": "https://nsfw.oisd.nl/dnsmasq",
+      "dest_file": "domains.txt"
+    }
+  }
 }
 
diff --git a/includes/functions.php b/includes/functions.php
index f4e26eca..f1b90b9e 100755
--- a/includes/functions.php
+++ b/includes/functions.php
@@ -570,8 +570,13 @@ function dnsServers()
 
 function blocklistProviders()
 {
-    $data = json_decode(file_get_contents("./config/blocklists.json"));
-    return (array) $data;
+    $raw = json_decode(file_get_contents("./config/blocklists.json"), true);
+    $result = [];
+
+    foreach ($raw as $group => $entries) {
+        $result[$group] = array_keys($entries);
+    }
+    return $result;
 }
 
 function optionsForSelect($options)