diff --git a/include/constant.h b/include/constant.h
index 03390d2..c25c4f7 100644
--- a/include/constant.h
+++ b/include/constant.h
@@ -13,6 +13,8 @@
 #define RESTART_DELAY    1
 #define DIVERTER_TIMEOUT 6
 
+// TODO: using CMAKE template
+
 #define VERSION     "1.3.3"
 #define CONFIG_FILE "cleardns.yml"
 
diff --git a/src/applet/adguard.c b/src/applet/adguard.c
index 2c64cfe..74c0d23 100644
--- a/src/applet/adguard.c
+++ b/src/applet/adguard.c
@@ -46,9 +46,26 @@ char *adguard_config(adguard *info, const char *raw_config) { // modify adguard
         log_fatal("AdGuardHome configure error");
     }
 
+    char *password = NULL;
+    cJSON *user_passwd = cJSON_GetObjectItem(cJSON_GetArrayItem(
+            cJSON_GetObjectItem(json, "users"), 0), "password");
+    if (cJSON_IsString(user_passwd)) {
+        char *hash_val = user_passwd->valuestring;
+        log_debug("Legacy hash value -> `%s`", hash_val);
+        if (bcrypt_verify(info->password, hash_val)) {
+            log_debug("Legacy hash value verify success");
+            password = strdup(hash_val);
+        } else {
+            log_debug("Legacy hash value verify failed");
+        }
+    }
+    if (password == NULL) { // password hash not ready
+        password = bcrypt_hash(info->password);
+    }
+    log_debug("AdGuardHome password -> `%s`", password);
+
     cJSON *user_config = cJSON_CreateObject(); // setting up username and password
     cJSON *users_config = cJSON_CreateArray();
-    char *password = bcrypt_hash(info->password);
     cJSON_AddItemToObject(user_config, "name", cJSON_CreateString(info->username));
     cJSON_AddItemToObject(user_config, "password", cJSON_CreateString(password));
     cJSON_AddItemToArray(users_config, user_config);
diff --git a/src/cleardns.c b/src/cleardns.c
index 2b129dd..31c85a3 100644
--- a/src/cleardns.c
+++ b/src/cleardns.c
@@ -117,28 +117,9 @@ void cleardns() { // cleardns service
     process_list_daemon(); // daemon all process
 }
 
-#include "bcrypt.h"
-
 int main(int argc, char *argv[]) {
     init(argc, argv);
     log_info("ClearDNS server start (%s)", VERSION);
-
-    LOG_LEVEL = LOG_DEBUG;
-    log_debug("test mode start");
-
-    const char demo_str[] = "dnomd343";
-    char *hash_ret = bcrypt_hash(demo_str);
-
-    log_info("bcrypt hash -> `%s`", hash_ret);
-
-    log_info("check ret -> `%s`", show_bool(bcrypt_verify(demo_str, hash_ret)));
-
-    log_info("check ret -> `%s`", show_bool(bcrypt_verify("233333", hash_ret)));
-
-    log_info("exit");
-
-    return 0;
-
     cleardns();
     return 0;
 }