diff --git a/backend/migrations/054_ttlock_fix_api_server.sql b/backend/migrations/054_ttlock_fix_api_server.sql
new file mode 100644
index 0000000..c81a423
--- /dev/null
+++ b/backend/migrations/054_ttlock_fix_api_server.sql
@@ -0,0 +1,12 @@
+-- Исправляем старые значения api_server: euopen.ttlock.com → euapi.ttlock.com
+-- (euopen — это веб-портал разработчиков, а не API-сервер)
+UPDATE hotel_ttlock_config
+SET api_server = 'https://euapi.ttlock.com'
+WHERE api_server = 'https://euopen.ttlock.com';
+
+UPDATE hotel_ttlock_config
+SET api_server = 'https://cnapi.ttlock.com'
+WHERE api_server = 'https://open.ttlock.com';
+
+ALTER TABLE hotel_ttlock_config
+  ALTER COLUMN api_server SET DEFAULT 'https://euapi.ttlock.com';
diff --git a/backend/src/routes/ttlock.ts b/backend/src/routes/ttlock.ts
index ebcff79..8cf7505 100644
--- a/backend/src/routes/ttlock.ts
+++ b/backend/src/routes/ttlock.ts
@@ -51,14 +51,14 @@ const ttlockRoutes: FastifyPluginAsync = async (fastify) => {
       [hotelId],
     )
     if (!rows[0]) {
-      return { isEnabled: false, clientId: '', cardSectors: '1,2,3,4,5,6,7,8,9,10', apiServer: 'https://euopen.ttlock.com' }
+      return { isEnabled: false, clientId: '', cardSectors: '1,2,3,4,5,6,7,8,9,10', apiServer: 'https://euapi.ttlock.com' }
     }
     const r = rows[0]
     return {
       isEnabled:   r.is_enabled,
       clientId:    r.client_id,
       cardSectors: r.card_sectors,
-      apiServer:   r.api_server ?? 'https://euopen.ttlock.com',
+      apiServer:   r.api_server ?? 'https://euapi.ttlock.com',
     }
   })
 
@@ -187,7 +187,7 @@ const ttlockRoutes: FastifyPluginAsync = async (fastify) => {
           type:         'ttlock:test_api',
           clientId:     cfg.client_id,
           clientSecret: cfg.client_secret,
-          apiServer:    cfg.api_server ?? 'https://euopen.ttlock.com',
+          apiServer:    cfg.api_server ?? 'https://euapi.ttlock.com',
         }, 15_000) as { ok?: boolean; lockCount?: number; error?: string }
 
         if (!result.ok) return reply.code(502).send({ error: result.error ?? 'Ошибка API' })
@@ -394,7 +394,7 @@ const ttlockRoutes: FastifyPluginAsync = async (fastify) => {
           cardSectors:  cfg.card_sectors,
           clientId:     cfg.client_id,
           clientSecret: cfg.client_secret,
-          apiServer:    cfg.api_server ?? 'https://euopen.ttlock.com',
+          apiServer:    cfg.api_server ?? 'https://euapi.ttlock.com',
           startDate:    checkIn,
           endDate:      checkOut,
         }, 30_000)
diff --git a/src/pages/TTLockPage.tsx b/src/pages/TTLockPage.tsx
index e081047..c4f503f 100644
--- a/src/pages/TTLockPage.tsx
+++ b/src/pages/TTLockPage.tsx
@@ -143,7 +143,7 @@ export function TTLockPage() {
   const [clientId, setClientId]         = useState('')
   const [clientSecret, setClientSecret] = useState('')
   const [cardSectors, setCardSectors]   = useState('1,2,3,4,5,6,7,8,9,10')
-  const [apiServer, setApiServer]       = useState('https://euopen.ttlock.com')
+  const [apiServer, setApiServer]       = useState('https://euapi.ttlock.com')
 
   // Per-workstation COM port state
   const [wsComPorts, setWsComPorts]   = useState<Record<string, string>>({})
@@ -243,7 +243,7 @@ export function TTLockPage() {
       setIsEnabled(cfg.isEnabled)
       setClientId(cfg.clientId)
       setCardSectors(cfg.cardSectors || '1,2,3,4,5,6,7,8,9,10')
-      setApiServer(cfg.apiServer || 'https://euopen.ttlock.com')
+      setApiServer(cfg.apiServer || 'https://euapi.ttlock.com')
       setMappings(maps)
       setRooms(roomList)
       setWorkstations(wsList)
@@ -415,8 +415,8 @@ export function TTLockPage() {
             <label className="form-label">Сервер TTLock API</label>
             <div className="flex gap-3 mt-1">
               {[
-                { value: 'https://euopen.ttlock.com', label: 'EU', hint: 'euopen.ttlock.com' },
-                { value: 'https://open.ttlock.com',   label: 'China', hint: 'open.ttlock.com' },
+                { value: 'https://euapi.ttlock.com', label: 'EU',    hint: 'euapi.ttlock.com' },
+                { value: 'https://cnapi.ttlock.com', label: 'China', hint: 'cnapi.ttlock.com' },
               ].map(opt => (
                 <label
                   key={opt.value}
@@ -441,7 +441,7 @@ export function TTLockPage() {
               ))}
             </div>
             <p className="text-xs text-slate-400 mt-1.5">
-              Если получаете ошибку 404 при выдаче карты — попробуйте другой сервер.
+              OAuth авторизация всегда через api.sciener.com. Выберите регион для /v3/ API.
             </p>
           </div>