diff --git a/module/base/base.py b/module/base/base.py
index a5c7b239c..ba2e5b7d5 100644
--- a/module/base/base.py
+++ b/module/base/base.py
@@ -1,7 +1,9 @@
+import module.config.server as server_
 from module.base.button import Button, ButtonWrapper, ClickButton, match_template
 from module.base.timer import Timer
 from module.base.utils import *
 from module.config.config import AzurLaneConfig
+from module.config.server import set_server, to_package
 from module.device.device import Device
 from module.logger import logger
 
@@ -258,3 +260,23 @@ class ModuleBase:
             value = load_image(value)
 
         self.device.image = value
+
+    def set_server(self, server):
+        """
+        For development.
+        Change server and  affect globally,
+        including assets and server specific methods.
+        """
+        package = to_package(server)
+        self.device.package = package
+        set_server(server)
+        logger.attr('Server', self.config.SERVER)
+
+    def set_lang(self, lang):
+        """
+        For development.
+        Change lang and affect globally,
+        including assets and server specific methods.
+        """
+        server_.server = lang
+        logger.attr('Language', self.config.SERVER)
diff --git a/module/ocr/ocr.py b/module/ocr/ocr.py
index 918e2798a..d8e669bdd 100644
--- a/module/ocr/ocr.py
+++ b/module/ocr/ocr.py
@@ -52,7 +52,8 @@ class OcrResultButton:
         self.text = boxed_result.ocr_text
         self.score = boxed_result.score
 
-    def match_keyword(self, ocr_text, keyword_classes):
+    @staticmethod
+    def match_keyword(ocr_text, keyword_classes):
         """
         Args:
             ocr_text (str):
@@ -95,7 +96,7 @@ class Ocr:
 
     def __init__(self, button: ButtonWrapper, lang=None, name=None):
         self.button: ButtonWrapper = button
-        self.lang: str = lang if lang is not None else Ocr.server2lang()
+        self._lang = lang
         self.name: str = name if name is not None else button.name
 
     @classmethod
@@ -108,6 +109,10 @@ class Ocr:
             case _:
                 return 'ch'
 
+    @cached_property
+    def lang(self) -> str:
+        return self._lang if self._lang is not None else Ocr.server2lang()
+
     @cached_property
     def model(self) -> TextSystem:
         return OCR_MODEL.__getattribute__(self.lang)
@@ -298,7 +303,8 @@ class Duration(Ocr):
         seconds = self._sanitize_number(matched.group('seconds'))
         return timedelta(hours=hours, minutes=minutes, seconds=seconds)
 
-    def _sanitize_number(self, number) -> int:
+    @staticmethod
+    def _sanitize_number(number) -> int:
         if number is None:
             return 0
         return int(number)