diff --git a/lib/app/changelog.dart b/lib/app/changelog.dart
index 0e8ca39..b798e51 100644
--- a/lib/app/changelog.dart
+++ b/lib/app/changelog.dart
@@ -1,4 +1,13 @@
 const lunarisChangelog = [
+  LunarisChange(
+    version: '2.3.9',
+    title: 'Исправление входа и синхронизации аккаунтов Pawchive',
+    bullets: [
+      'Исправлены API эндпоинты Pawchive: пути запросов избранных авторов и управления подписками приведены в соответствие со спецификацией API v1 (/api/v1/account/favorites, /api/v1/favorites/creator/...).',
+      'Устранена ошибка 404: авторизация по логину и паролю, а также по session cookie теперь успешно завершается и сразу синхронизирует всех авторов.',
+      'Информативные ошибки: понятные сообщения на русском при неверном пароле или сбое сети вместо сырых исключений Dio.',
+    ],
+  ),
   LunarisChange(
     version: '2.3.8',
     title: 'ABI-Aware Auto-Update — правильный APK для вашего процессора',
diff --git a/lib/backend/services/pawchive_sync_service.dart b/lib/backend/services/pawchive_sync_service.dart
index a011cae..5d747c9 100644
--- a/lib/backend/services/pawchive_sync_service.dart
+++ b/lib/backend/services/pawchive_sync_service.dart
@@ -3,7 +3,6 @@ import 'package:dio/dio.dart';
 import 'package:flutter_riverpod/flutter_riverpod.dart';
 
 import '../../core/http/dio_client.dart';
-import '../di/backend_providers.dart';
 import '../models/favorite_artist_item.dart';
 import '../models/pawchive_account.dart';
 import 'settings_service.dart';
@@ -98,10 +97,25 @@ class PawchiveSyncService {
       }
 
       // Check if redirect points back to login with flash error
-      if (redirectLocation.contains('/account/login')) {
+      if (redirectLocation.contains('/account/login') ||
+          redirectLocation.contains('/login')) {
         throw StateError('Неверный логин или пароль');
       }
 
+      // Check for flash errors in session cookie if present
+      try {
+        final dotIdx = sessionValue.indexOf('.');
+        final payloadBase64 =
+            dotIdx != -1 ? sessionValue.substring(0, dotIdx) : sessionValue;
+        final normalizedB64 = base64Url.normalize(payloadBase64);
+        final decoded = utf8.decode(base64Url.decode(normalizedB64));
+        if (decoded.contains('is incorrect') || decoded.contains('_flashes')) {
+          throw StateError('Неверный логин или пароль');
+        }
+      } catch (e) {
+        if (e is StateError) rethrow;
+      }
+
       // Verify session and fetch initial artists
       final remoteArtists = await fetchRemoteFavoriteArtists(
         baseUrl: normalizedBase,
@@ -118,6 +132,15 @@ class PawchiveSyncService {
         isActive: true,
         syncedArtistsCount: remoteArtists.length,
       );
+    } on DioException catch (e) {
+      final code = e.response?.statusCode;
+      if (code == 401 || code == 403) {
+        throw StateError('Неверный логин или пароль');
+      } else if (code != null) {
+        throw StateError('Ошибка сервера Pawchive (HTTP $code)');
+      } else {
+        throw StateError('Ошибка сети: ${e.message ?? e.type.name}');
+      }
     } catch (e) {
       if (e is StateError || e is ArgumentError) rethrow;
       throw StateError('Ошибка входа в Pawchive: $e');
@@ -156,7 +179,17 @@ class PawchiveSyncService {
         isActive: true,
         syncedArtistsCount: remoteArtists.length,
       );
+    } on DioException catch (e) {
+      final code = e.response?.statusCode;
+      if (code == 401 || code == 403) {
+        throw StateError('Сессия недействительна или истекла');
+      } else if (code != null) {
+        throw StateError('Ошибка сервера Pawchive (HTTP $code)');
+      } else {
+        throw StateError('Ошибка сети: ${e.message ?? e.type.name}');
+      }
     } catch (e) {
+      if (e is StateError || e is ArgumentError) rethrow;
       throw StateError('Сессия недействительна или истекла: $e');
     }
   }
@@ -172,7 +205,7 @@ class PawchiveSyncService {
         : baseUrl;
 
     final response = await _dio.get<dynamic>(
-      '$normalizedBase/account/favorites',
+      '$normalizedBase/api/v1/account/favorites',
       queryParameters: {'type': 'artist'},
       options: Options(
         headers: {
@@ -180,9 +213,17 @@ class PawchiveSyncService {
           'Accept': 'application/json',
           'User-Agent': 'Lunaris/2.0.1 Flutter local booru browser',
         },
+        validateStatus: (status) => status != null && status < 500,
       ),
     );
 
+    if (response.statusCode == 401 || response.statusCode == 403) {
+      throw StateError('Сессия истекла или недействительна');
+    }
+    if (response.statusCode != 200) {
+      throw StateError('Ошибка сервера Pawchive (HTTP ${response.statusCode})');
+    }
+
     final data = response.data;
     if (data is! List) return const [];
 
@@ -344,7 +385,7 @@ class PawchiveSyncService {
         ? account.baseUrl.substring(0, account.baseUrl.length - 1)
         : account.baseUrl;
 
-    final path = '$normalizedBase/favorites/creator/$service/$artistId';
+    final path = '$normalizedBase/api/v1/favorites/creator/$service/$artistId';
     final options = Options(
       headers: {
         'Cookie': 'session=$cleanCookie',
diff --git a/pubspec.yaml b/pubspec.yaml
index 0b87121..8cb4c8b 100644
--- a/pubspec.yaml
+++ b/pubspec.yaml
@@ -1,7 +1,7 @@
 name: gel_rule_app
 description: Local backend/core layer for a Flutter booru browser app.
 publish_to: "none"
-version: 2.3.8+48
+version: 2.3.9+49
 
 environment:
   sdk: ">=3.3.0 <4.0.0"
diff --git a/test/backend/pawchive_sync_test.dart b/test/backend/pawchive_sync_test.dart
index 78501f8..f9086c5 100644
--- a/test/backend/pawchive_sync_test.dart
+++ b/test/backend/pawchive_sync_test.dart
@@ -253,7 +253,7 @@ void main() {
       );
       expect(addResult, isTrue);
       expect(lastMethod, equals('POST'));
-      expect(lastPath, equals('https://pawchive.pw/favorites/creator/fanbox/12345'));
+      expect(lastPath, equals('https://pawchive.pw/api/v1/favorites/creator/fanbox/12345'));
 
       final removeResult = await service.toggleRemoteFavorite(
         account: account,
@@ -263,7 +263,7 @@ void main() {
       );
       expect(removeResult, isTrue);
       expect(lastMethod, equals('DELETE'));
-      expect(lastPath, equals('https://pawchive.pw/favorites/creator/fanbox/12345'));
+      expect(lastPath, equals('https://pawchive.pw/api/v1/favorites/creator/fanbox/12345'));
     });
   });
 }