diff --git a/README.cn.md b/README.cn.md
index cc02f59..f76d821 100644
--- a/README.cn.md
+++ b/README.cn.md
@@ -19,6 +19,12 @@ Stable Diffusion Webui 扩展Civitai助手，用于更轻松的管理和使用Ci
 
 
 # 使用方法
+## 更新你的SD webui
+本扩展需要取到 Extra Network的卡片列表id。**这个是从2023-02-06，才添加到SD webui里面的。**  
+
+所以，如果你用的版本比这个早，你就需要先更新你的SD Webui！
+
+
 ## 扫描模型
 前往扩展页面"Civitai Helper"，有个按钮叫："Scan Model"  
 
diff --git a/README.md b/README.md
index 864c81c..c0f8529 100644
--- a/README.md
+++ b/README.md
@@ -26,6 +26,11 @@ Then reload UI with "Reload UI" Button in Setting tab.
 Done.
 
 # How to Use
+## Update Your SD Webui
+This extension need to get extra network's cards id. **Which is added to SD webui since 2023-02-06.** 
+
+So, if you are using a version older than this, you need to update your SD Webui! 
+
 ## Scanning Models
 Go to extension tab "Civitai Helper". There is a button called "Scan model".  
 
diff --git a/scripts/civitai_helper.py b/scripts/civitai_helper.py
index 5fb39e8..33c3e8b 100644
--- a/scripts/civitai_helper.py
+++ b/scripts/civitai_helper.py
@@ -72,7 +72,7 @@ def on_ui_tabs():
                 with gr.Column():
                     gr.Markdown("### Scan Models for Civitai")
                     with gr.Row():
-                        low_memory_sha_ckb = gr.Checkbox(label="Memory Optimized SHA256", value=low_memory_sha, elem_id="ch_low_memory_sha_ckb")
+                        low_memory_sha_ckb = gr.Checkbox(label="Memory Optimized SHA256", value=low_memory_sha, visible=False, elem_id="ch_low_memory_sha_ckb")
                         max_size_preview_ckb = gr.Checkbox(label="Download Max Size Preview", value=max_size_preview, elem_id="ch_max_size_preview_ckb")
                         skip_nsfw_preview_ckb = gr.Checkbox(label="SKip NSFW Preview images", value=skip_nsfw_preview, elem_id="ch_skip_nsfw_preview_ckb")
 
diff --git a/scripts/lib/model_action_civitai.py b/scripts/lib/model_action_civitai.py
index 4b7e33b..a8c2375 100644
--- a/scripts/lib/model_action_civitai.py
+++ b/scripts/lib/model_action_civitai.py
@@ -29,6 +29,7 @@ def scan_model(low_memory_sha, max_size_preview, skip_nsfw_preview):
                     info_file = base + civitai.suffix + model.info_ext
                     # check info file
                     if not os.path.isfile(info_file):
+                        util.printD("Creating model info for: " + filename)
                         # get model's sha256
                         hash = util.gen_file_sha256(item, low_memory_sha)
 
diff --git a/scripts/lib/util.py b/scripts/lib/util.py
index 3b4bc01..4d91467 100644
--- a/scripts/lib/util.py
+++ b/scripts/lib/util.py
@@ -12,12 +12,17 @@ def gen_file_sha256(filname, is_low_memory=True):
     printD("Calculate SHA256")
     hash_sha256 = hashlib.sha256()
     with open(filname, "rb") as f:
-        if is_low_memory:
-            printD("Using Memory Optimized SHA256")
-            for chunk in iter(lambda: f.read(4096), b""):
-                hash_sha256.update(chunk)
-        else:
-            hash_sha256.update(f.read())
+        # force to use Memory Optimized SHA256
+        # In case people don't understand this and uncheck it then stuck their system
+        printD("Using Memory Optimized SHA256")
+        for chunk in iter(lambda: f.read(4096), b""):
+            hash_sha256.update(chunk)
+        # if is_low_memory:
+        #     printD("Using Memory Optimized SHA256")
+        #     for chunk in iter(lambda: f.read(4096), b""):
+        #         hash_sha256.update(chunk)
+        # else:
+        #     hash_sha256.update(f.read())
 
 
     hash_value =  hash_sha256.hexdigest()