diff --git a/gui_v1.py b/gui_v1.py
index 8f910d9..45a5891 100644
--- a/gui_v1.py
+++ b/gui_v1.py
@@ -159,7 +159,7 @@ if __name__ == "__main__":
             if not check_all_assets(update=self.config.update):
                 if self.config.update:
                     download_all_assets(tmpdir=tmp)
-                    if not check_all_assets(update=False):
+                    if not check_all_assets(update=self.config.update):
                         printt("counld not satisfy all assets needed.")
                         exit(1)
 
diff --git a/infer-web.py b/infer-web.py
index bdf3357..306c448 100644
--- a/infer-web.py
+++ b/infer-web.py
@@ -60,7 +60,7 @@ if not config.nocheck:
     if not check_all_assets(update=config.update):
         if config.update:
             download_all_assets(tmpdir=tmp)
-            if not check_all_assets(update=False):
+            if not check_all_assets(update=config.update):
                 logging.error("counld not satisfy all assets needed.")
                 exit(1)
 
@@ -1608,13 +1608,16 @@ with gr.Blocks(title="RVC WebUI") as app:
             except:
                 gr.Markdown(traceback.format_exc())
 
-    if config.iscolab:
-        app.queue(max_size=1022).launch(share=True, max_threads=511)
-    else:
-        app.queue(max_size=1022).launch(
-            max_threads=511,
-            server_name="0.0.0.0",
-            inbrowser=not config.noautoopen,
-            server_port=config.listen_port,
-            quiet=True,
-        )
+    try:
+        if config.iscolab:
+            app.queue(max_size=1022).launch(share=True, max_threads=511)
+        else:
+            app.queue(max_size=1022).launch(
+                max_threads=511,
+                server_name="0.0.0.0",
+                inbrowser=not config.noautoopen,
+                server_port=config.listen_port,
+                quiet=True,
+            )
+    except Exception as e:
+        logger.error(str(e))
diff --git a/infer/lib/rvcmd.py b/infer/lib/rvcmd.py
index d1e357b..167853f 100644
--- a/infer/lib/rvcmd.py
+++ b/infer/lib/rvcmd.py
@@ -28,13 +28,19 @@ def check_model(
         return False
     with open(target, "rb") as f:
         digest = sha256(f)
+        bakfile = f"{target}.bak"
         if digest != hash:
-            logger.info(f"{target} sha256 hash mismatch.")
+            logger.warn(f"{target} sha256 hash mismatch.")
             logger.info(f"expected: {hash}")
             logger.info(f"real val: {digest}")
+            logger.warn("please add parameter --update to download the latest assets.")
             if remove_incorrect:
-                os.remove(str(target))
+                if not os.path.exists(bakfile):
+                    os.rename(str(target), bakfile)
+                else: os.remove(str(target))
             return False
+        if remove_incorrect and os.path.exists(bakfile):
+            os.remove(bakfile)
     return True