diff --git a/devapp/dev_types.py b/devapp/dev_types.py
index 8a232a5..7baf5e0 100644
--- a/devapp/dev_types.py
+++ b/devapp/dev_types.py
@@ -516,7 +516,12 @@ class ZteOnuDevice(OnuDevice):
             ip = device.parent_dev.ip_address
         if ip:
             mac = str(device.mac_addr).encode()
-            sn = b"ZTEG%s" % b''.join(mac.split(b':')[-4:]).upper()
+
+            # Format serial number from mac address
+            # because saved mac address was make from serial number
+            sn = (b'%.2X' % int(x, base=16) for x in mac.split(b':')[-4:])
+            sn = b"ZTEG%s" % b''.join(sn)
+
             telnet = extra_data.get('telnet')
             if telnet is None:
                 raise DeviceConfigurationError('For ZTE configuration needed "telnet" section in extra_data')
diff --git a/devapp/templates/devapp/custom_dev_page/olt_ztec320.html b/devapp/templates/devapp/custom_dev_page/olt_ztec320.html
index ee910f1..d1e9a02 100644
--- a/devapp/templates/devapp/custom_dev_page/olt_ztec320.html
+++ b/devapp/templates/devapp/custom_dev_page/olt_ztec320.html
@@ -17,15 +17,9 @@
                     {% for fiber in dev_manager.get_fibers %}
                         <div class="port{% if fiber.fb_onu_num > 0 %} mega{% endif %} text-center">
                             <b>{{ fiber.fb_name }}</b>
-                            {% if fiber.fb_onu_num > 0 %}
-                                <a href="{% url 'devapp:zte_port_view_uncfg' grp dev.id fiber.fb_id %}" class="port-img">
-                                    <b>{{ fiber.fb_onu_num }}</b>
-                                </a>
-                            {% else %}
-                                <a href="#" class="port-img">
-                                    <b>0</b>
-                                </a>
-                            {% endif %}
+                            <a href="{% url 'devapp:zte_port_view_uncfg' grp dev.id fiber.fb_id %}" class="port-img">
+                                <b>{{ fiber.fb_onu_num }}</b>
+                            </a>
                         </div>
                     {% empty %}
                         <h3>{% trans 'We have not received info, please check options :(' %}</h3>
diff --git a/djing/settings.py b/djing/settings.py
index 8c24531..d8bbed9 100644
--- a/djing/settings.py
+++ b/djing/settings.py
@@ -126,12 +126,12 @@ SESSION_COOKIE_HTTPONLY = True
 # Internationalization
 # https://docs.djangoproject.com/en/1.11/topics/i18n/
 
-LANGUAGE_CODE = 'ru-RU'
+LANGUAGE_CODE = 'ru'
 
-#LANGUAGES = (
-#    ('ru', _('Russian')),
-#    ('en', _('English'))
-#)
+LANGUAGES = (
+    ('ru', _('Russian')),
+    #('en', _('English'))
+)
 
 PROJECT_PATH = os.path.dirname(os.path.abspath(__file__))