diff --git a/sane/DlgCfgMgr.cpp b/sane/DlgCfgMgr.cpp
index 5b35962..5ff5cd0 100644
--- a/sane/DlgCfgMgr.cpp
+++ b/sane/DlgCfgMgr.cpp
@@ -9,7 +9,7 @@
 
 // CDlgIndicator 对话框
 
-dlg_cfg_mgr::dlg_cfg_mgr(gb::scanner_cfg* cfg, HWND parent) : cfg_(cfg), dlg_base(parent, IDD_CFG_MGR)
+dlg_cfg_mgr::dlg_cfg_mgr(gb::scanner_cfg* cfg, HWND parent) : cfg_(cfg), dlg_base(parent, IDD_CFG_MGR), schm_changed_(false)
 {
 	create();
 	
@@ -199,10 +199,18 @@ void dlg_cfg_mgr::on_del_selected(void)
 		{
 			changed = true;
 			ListView_DeleteItem(lwnd, sels[i]);
+			schm_changed_ = true;
 		}
 	}
 }
 void dlg_cfg_mgr::on_del_all(void)
 {
 	cfg_->remove_all_schemes();
+	ListView_DeleteAllItems(get_item(IDC_LIST1));	// clear list
+	schm_changed_ = true;
+	dlg_base::set_item_text(IDC_EDIT1, L"");
+}
+bool dlg_cfg_mgr::is_scheme_changed(void)
+{
+	return schm_changed_;
 }
diff --git a/sane/DlgCfgMgr.h b/sane/DlgCfgMgr.h
index 04accf3..ef66783 100644
--- a/sane/DlgCfgMgr.h
+++ b/sane/DlgCfgMgr.h
@@ -15,6 +15,7 @@ class dlg_cfg_mgr: public dlg_base
 {
 	gb::scanner_cfg*	cfg_;
 	std::wstring		label_;
+	bool				schm_changed_;	// to notify parent refreshing UI and settings
 
 	BOOL handle_message(UINT msg, WPARAM wp, LPARAM lp) override;
 	void handle_command(WORD code, WORD id, HANDLE ctrl);
@@ -32,4 +33,5 @@ public:
 	~dlg_cfg_mgr();
 
 public:
+	bool is_scheme_changed(void);
 };
diff --git a/sane/DlgSetting.cpp b/sane/DlgSetting.cpp
index 645574d..ebbae8c 100644
--- a/sane/DlgSetting.cpp
+++ b/sane/DlgSetting.cpp
@@ -130,6 +130,7 @@ void dlg_setting::handle_command(WORD code, WORD id, HANDLE ctrl)
 					}
 					n->release();
 				}
+				s->end_setting(true);	// discard changes in prev-scheme
 				s->release();
 			}
 		}
@@ -143,7 +144,7 @@ void dlg_setting::handle_command(WORD code, WORD id, HANDLE ctrl)
 				gb::sane_config_schm* s = cfg_->get_scheme();
 				if (s)
 				{
-					s->end_setting(true);
+					s->end_setting(false); 	// save changes
 					s->release();
 				}
 
@@ -180,7 +181,7 @@ void dlg_setting::handle_command(WORD code, WORD id, HANDLE ctrl)
 			gb::sane_config_schm* schm = cfg_->get_scheme();
 			if (schm)
 			{
-				schm->end_setting(true);
+				schm->end_setting(false);
 				schm->release();
 			}
 			cfg_->select_scheme(nullptr);
@@ -195,6 +196,14 @@ void dlg_setting::handle_command(WORD code, WORD id, HANDLE ctrl)
 	{
 		dlg_cfg_mgr	dlg(cfg_, hwnd());
 		dlg.do_modal(hwnd());
+		if (dlg.is_scheme_changed())	// refresh settings and UI
+		{
+			gb::sane_config_schm* schm = cfg_->get_scheme();
+			apply_scheme_(schm, apply_param_);
+			if (schm)
+				schm->release();
+			refresh_controls(-1);
+		}
 	}
 	else if (id == IDC_BUTTON_CONFIG_MENU)
 	{
diff --git a/sane/gb_json.cpp b/sane/gb_json.cpp
index 0964150..a9aa402 100644
--- a/sane/gb_json.cpp
+++ b/sane/gb_json.cpp
@@ -236,23 +236,23 @@ namespace gb
             cj = cj->next;
         }
 
-        if (arr_val_.size() == 1 && arr_val_[0]->arr_val_.size() == 0)
-        {
-            json* child = arr_val_[0];
-
-            if (!child->key_.empty())	// array
-            {
-                arr_val_.clear();
-                type_ = child->type_;
-                key_ = child->key_;
-                simple_val_.dval = child->simple_val_.dval;
-                strval_ = child->strval_;
-                for (auto& v : child->arr_val_)
-                    arr_val_.push_back(v);
-                child->arr_val_.clear();
-                child->release();
-            }
-        }
+        //if (arr_val_.size() == 1 && arr_val_[0]->arr_val_.size() == 0)
+        //{
+        //    json* child = arr_val_[0];
+        //
+        //    if (!child->key_.empty())	// array
+        //    {
+        //        arr_val_.clear();
+        //        type_ = child->type_;
+        //        key_ = child->key_;
+        //        simple_val_.dval = child->simple_val_.dval;
+        //        strval_ = child->strval_;
+        //        for (auto& v : child->arr_val_)
+        //            arr_val_.push_back(v);
+        //        child->arr_val_.clear();
+        //        child->release();
+        //    }
+        //}
 
         if (arr_val_.size())
         {
@@ -510,9 +510,9 @@ namespace gb
     }
     json* json::first_child(void)
     {
+        cur_child_ = 0;
         if (type_ == VAL_TYPE_OBJECT || type_ == VAL_TYPE_ARRAY)
         {
-            cur_child_ = 0;
             if (arr_val_.size())
             {
                 arr_val_[0]->add_ref();
@@ -522,6 +522,10 @@ namespace gb
         }
 
         return nullptr;
+        // leaf node, return self
+        //add_ref();
+
+        //return this;
     }
     json* json::next_child(void)
     {
@@ -1597,7 +1601,15 @@ namespace gb
                 jsn_->set_value("ver", ver);
             }
 
-            std::string cont(jsn_->to_string());
+            std::string cont("");
+            //if (jsn_->is_leaf_node())
+            //{
+            //    jsn_->value(cont);
+            //    cont.insert(0, "{\"" + jsn_->key() + "\":\"");
+            //    cont += "\"}";
+            //}
+            //else
+                cont = jsn_->to_string();
             if (b64)
             {
                 gb::base64	b64;
diff --git a/twain/twain/huagaods.cpp b/twain/twain/huagaods.cpp
index 570f858..95c41f0 100644
--- a/twain/twain/huagaods.cpp
+++ b/twain/twain/huagaods.cpp
@@ -28,6 +28,8 @@ using namespace std::placeholders;
 
 extern HMODULE me_;
 
+// WIA COM:	IStiUSD & IWiaMiniDrv 
+
 //custom define caps enum
 enum CapTypeEx : unsigned short {
 	CAP_TYPE_EX_FILL_BLACK_BKG = 0x8004,