diff --git a/RevokeMsgPatcher/FormMain.cs b/RevokeMsgPatcher/FormMain.cs
index b0ff41d..b53e2a1 100644
--- a/RevokeMsgPatcher/FormMain.cs
+++ b/RevokeMsgPatcher/FormMain.cs
@@ -188,6 +188,7 @@ namespace RevokeMsgPatcher
         {
             EnableAllButton(false);
             RadioButton radioButton = sender as RadioButton;
+            // 切换使用不同的防撤回对象
             if (rbtWechat.Checked)
             {
                 modifier = (WechatModifier)rbtWechat.Tag;
diff --git a/RevokeMsgPatcher/JsonData.cs b/RevokeMsgPatcher/JsonData.cs
index f21817d..87b15a4 100644
--- a/RevokeMsgPatcher/JsonData.cs
+++ b/RevokeMsgPatcher/JsonData.cs
@@ -162,23 +162,23 @@ namespace RevokeMsgPatcher
                             {
                                 Name = "IM.dll",
                                 Version = "2.3.2.21173",
-                                SHA1Before = "c6632339fbe675312a70ae4620e70699c258cd36",
-                                SHA1After = "e9ddc5cc681950796fc8fe4c55f580428c890b51",
+                                SHA1Before = "ecf3e69f3fb100ffe2fee095ffded591b9781024",
+                                SHA1After = "0514d1304e7ac46b4d33386ec3313888f5ae7171",
                                 Changes = new List<Change>
                                 {
                                     new Change
                                     {
-                                        Position = 0x0005009F,
+                                        Position = 0x0004D78A,
                                         Content = new byte[] { 0xEB, 0x90, 0x90, 0x90, 0x90 }
                                     },
                                     new Change
                                     {
-                                        Position = 0x000502BC,
+                                        Position = 0x0004D9A7,
                                         Content = new byte[] { 0xEB, 0x90, 0x90, 0x90, 0x90 }
                                     },
                                     new Change
                                     {
-                                        Position = 0x0005046C,
+                                        Position = 0x0004DB57,
                                         Content = new byte[] { 0xEB, 0x08, 0x90, 0x90, 0x90, 0x90 }
                                     }
                                 }
diff --git a/RevokeMsgPatcher/Model/TargetFile.cs b/RevokeMsgPatcher/Model/TargetFile.cs
deleted file mode 100644
index f4c8819..0000000
--- a/RevokeMsgPatcher/Model/TargetFile.cs
+++ /dev/null
@@ -1,23 +0,0 @@
-using System;
-using System.Collections.Generic;
-using System.Linq;
-using System.Text;
-using System.Threading.Tasks;
-
-namespace RevokeMsgPatcher.Model
-{
-    public class TargetFile
-    {
-        public string FileName { get; set; }
-
-        public string Version { get; set; }
-
-        public string SHA1Before { get; set; }
-
-        public string SHA1After { get; set; }
-
-        public long Position { get; set; }
-
-        public byte Content { get; set; }
-    }
-}
diff --git a/RevokeMsgPatcher/Model/Version.cs b/RevokeMsgPatcher/Model/Version.cs
deleted file mode 100644
index d14d55c..0000000
--- a/RevokeMsgPatcher/Model/Version.cs
+++ /dev/null
@@ -1,15 +0,0 @@
-using System;
-using System.Collections.Generic;
-using System.Linq;
-using System.Text;
-using System.Threading.Tasks;
-
-namespace RevokeMsgPatcher.Model
-{
-    public class Version
-    {
-        public string AppVersion { get; set; }
-
-        public List<ModifyInfo> Files { get; set; }
-    }
-}
diff --git a/RevokeMsgPatcher/Patcher.cs b/RevokeMsgPatcher/Patcher.cs
deleted file mode 100644
index 91f575f..0000000
--- a/RevokeMsgPatcher/Patcher.cs
+++ /dev/null
@@ -1,92 +0,0 @@
-using RevokeMsgPatcher.Model;
-using System.Collections.Generic;
-using System.Diagnostics;
-using System.IO;
-using System.Web.Script.Serialization;
-using File = System.IO.File;
-
-namespace RevokeMsgPatcher
-{
-    public class Patcher
-    {
-        private string intallPath;
-        public string IntallPath
-        {
-            get { return intallPath; }
-            set
-            {
-                intallPath = value;
-                if (!string.IsNullOrEmpty(intallPath) && Util.IsWechatInstallPath(intallPath))
-                {
-                    dllPath = Path.Combine(intallPath, "WeChatWin.dll");
-                    bakPath = Path.Combine(intallPath, "WeChatWin.dll.h.bak");
-                }
-                else
-                {
-                    intallPath = null;
-                    dllPath = null;
-                    bakPath = null;
-                }
-            }
-        }
-
-        private string dllPath;
-        private string bakPath;
-
-        public string DllPath { get => dllPath; }
-        public string BakPath { get => bakPath; }
-
-        private List<TargetFile> targetFiles;
-        private TargetFile currentFile;
-
-        public List<TargetFile> TargetFiles { get => targetFiles; }
-
-        public Patcher()
-        {
-            JavaScriptSerializer serializer = new JavaScriptSerializer();
-            targetFiles = serializer.Deserialize<List<TargetFile>>(Properties.Resources.PatchJson);
-        }
-
-        public void SetNewPatchJson(string json)
-        {
-            JavaScriptSerializer serializer = new JavaScriptSerializer();
-            targetFiles = serializer.Deserialize<List<TargetFile>>(json);
-        }
-
-        public string JudgeVersion()
-        {
-            string sha1 = Util.ComputeFileSHA1(dllPath);
-            Debug.WriteLine(sha1);
-
-            foreach (TargetFile t in targetFiles)
-            {
-                if (sha1 == t.SHA1After)
-                {
-                    return "done";
-                }
-                if (sha1 == t.SHA1Before)
-                {
-                    currentFile = t;
-                    return t.Version;
-                }
-            }
-            return null;
-        }
-
-        public bool Patch()
-        {
-            if (currentFile != null)
-            {
-                File.Copy(dllPath, bakPath, true);
-                bool done = Util.EditHex(dllPath, currentFile.Position, currentFile.Content);
-                if (!done)
-                {
-                    File.Copy(bakPath, dllPath, true);
-                }
-                return done;
-            }
-            return false;
-        }
-
-    }
-}
diff --git a/RevokeMsgPatcher/RevokeMsgPatcher.csproj b/RevokeMsgPatcher/RevokeMsgPatcher.csproj
index 78cdd0e..4536741 100644
--- a/RevokeMsgPatcher/RevokeMsgPatcher.csproj
+++ b/RevokeMsgPatcher/RevokeMsgPatcher.csproj
@@ -59,21 +59,17 @@
     <Compile Include="Model\Bag.cs" />
     <Compile Include="Model\Change.cs" />
     <Compile Include="Model\ModifyInfo.cs" />
-    <Compile Include="Model\TargetFile.cs" />
     <Compile Include="Model\TargetInfo.cs" />
-    <Compile Include="Model\Version.cs" />
     <Compile Include="Modifier\AppModifier.cs" />
     <Compile Include="Modifier\FileHexEditor.cs" />
     <Compile Include="Modifier\QQModifier.cs" />
     <Compile Include="Modifier\TIMModifier.cs" />
     <Compile Include="Modifier\WechatModifier.cs" />
-    <Compile Include="Patcher.cs" />
     <Compile Include="Utils\FileUtil.cs" />
     <Compile Include="Utils\PathUtil.cs" />
     <Compile Include="Program.cs" />
     <Compile Include="Properties\AssemblyInfo.cs" />
     <Compile Include="JsonData.cs" />
-    <Compile Include="Util.cs" />
     <EmbeddedResource Include="FormMain.resx">
       <DependentUpon>FormMain.cs</DependentUpon>
     </EmbeddedResource>
diff --git a/RevokeMsgPatcher/Util.cs b/RevokeMsgPatcher/Util.cs
deleted file mode 100644
index 3b40939..0000000
--- a/RevokeMsgPatcher/Util.cs
+++ /dev/null
@@ -1,109 +0,0 @@
-using Microsoft.Win32;
-using System;
-using System.Diagnostics;
-using System.IO;
-using System.Security.Cryptography;
-using System.Text;
-
-namespace RevokeMsgPatcher
-{
-    public class Util
-    {
-
-        /// <summary>
-        /// 自动查找安装路径
-        /// </summary>
-        /// <returns>安装路径</returns>
-        public static string AutoFindInstallPath()
-        {
-            // 微信的注册表路径
-            try
-            {
-                RegistryKey key = Registry.LocalMachine.OpenSubKey(@"Software\Microsoft\Windows\CurrentVersion\Uninstall\WeChat");
-                object installLocation = key.GetValue("InstallLocation");
-                key.Close();
-                if (installLocation == null || string.IsNullOrEmpty(installLocation.ToString()) || !IsWechatInstallPath(installLocation.ToString()))
-                {
-                    // 从默认安装目录查找
-                    string[] drives = Environment.GetLogicalDrives(); //获取当前计算机逻辑磁盘名称列表
-                    foreach (string d in drives)
-                    {
-                        string assertPath = Path.Combine(d, @"Program Files (x86)\Tencent\WeChat");
-                        if (IsWechatInstallPath(assertPath))
-                        {
-                            return assertPath;
-                        }
-                    }
-                }
-                else
-                {
-                    return installLocation.ToString();
-                }
-            }
-            catch(Exception e)
-            {
-                Console.WriteLine(e.Message);
-            }
-            return null;
-        }
-
-        /// <summary>
-        /// 通过文件是否存在判断是否是安装目录
-        /// </summary>
-        /// <param name="path">安装目录</param>
-        /// <returns></returns>
-        public static bool IsWechatInstallPath(string path)
-        {
-            return File.Exists(Path.Combine(path, "WeChatWin.dll")) && File.Exists(Path.Combine(path, "WeChat.exe"));
-        }
-
-        /// <summary>
-        /// 获取文件版本
-        /// </summary>
-        /// <param name="path"></param>
-        /// <returns></returns>
-        public static string GetFileVersion(string path)
-        {
-            FileVersionInfo fileVersionInfo = FileVersionInfo.GetVersionInfo(path);
-            return fileVersionInfo.FileVersion;
-        }
-
-        /// <summary>
-        /// 计算文件SHA1
-        /// </summary>
-        /// <param name="s"></param>
-        /// <returns></returns>
-        public static string ComputeFileSHA1(string s)
-        {
-            FileStream file = new FileStream(s, FileMode.Open);
-            SHA1 sha1 = new SHA1CryptoServiceProvider();
-            byte[] retval = sha1.ComputeHash(file);
-            file.Close();
-
-            StringBuilder sc = new StringBuilder();
-            for (int i = 0; i < retval.Length; i++)
-            {
-                sc.Append(retval[i].ToString("x2"));
-            }
-            return sc.ToString();
-        }
-
-        /// <summary>
-        /// 修改文件指定位置的字节
-        /// </summary>
-        /// <param name="path">WeChatWin.dll 的路径</param>
-        /// <param name="position">偏移位置</param>
-        /// <param name="after">修改后的值</param>
-        /// <returns></returns>
-        public static bool EditHex(string path, long position, byte after)
-        {
-            using (var stream = new FileStream(path, FileMode.Open, FileAccess.ReadWrite))
-            {
-                stream.Position = position;
-                stream.WriteByte(after);
-            }
-            return true;
-
-        }
-    }
-}