diff --git a/Users/UsersManager.cs b/Users/UsersManager.cs
index 26425b0..cbd8ce2 100644
--- a/Users/UsersManager.cs
+++ b/Users/UsersManager.cs
@@ -9,6 +9,7 @@ namespace Akari.Provider.WaveshareUART.Users
 {
     public class UsersManager
     {
+        public const int RangeStart = 1;
         public const int RangeLength = 20;
         public const string UsersFilePath = "users.yaml";
 
@@ -51,7 +52,7 @@ namespace Akari.Provider.WaveshareUART.Users
             var usedStarts = _users.Select(u => u.Start).ToHashSet();
             int start;
 
-            for (start = 0; start < ushort.MaxValue; start += RangeLength)
+            for (start = RangeStart; start < ushort.MaxValue; start += RangeLength)
             {
                 if (!usedStarts.Contains((ushort)start))
                 {
@@ -103,7 +104,7 @@ namespace Akari.Provider.WaveshareUART.Users
             return true;
         }
 
-        private void Save()
+        public void Save()
         {
             try
             {