diff --git a/README.md b/README.md
index d03e6c7..d6ab884 100644
--- a/README.md
+++ b/README.md
@@ -58,14 +58,14 @@ bash reinstall.sh windows \
 
 ### DD
 
-```bash
-bash reinstall.sh dd --img=https://example.com/xxx.xz
-```
-
 支持 gzip、xz 格式
 
 支持自动配置静态 IP、扩展系统盘
 
+```bash
+bash reinstall.sh dd --img=https://example.com/xxx.xz
+```
+
 ### 重启到 Alpine 救援系统（不运行重装）
 
 可用 ssh 连接，进行手动 DD、修改分区等操作
@@ -76,16 +76,40 @@ bash reinstall.sh alpine --hold=1
 
 ## Windows 下使用
 
-下载（链接另存为）放到同一目录
+管理员权限打开 `cmd` 窗口
 
-<https://raw.githubusercontent.com/bin456789/reinstall/main/reinstall.bat>
+如果打开的是 `powershell` 窗口，先进入 `cmd`
 
-<https://raw.githubusercontent.com/bin456789/reinstall/main/reinstall.sh>
+### 下载
 
-管理员权限打开 `cmd` / `powershell` 窗口，先运行 `cmd`（重要），再运行：
+```batch
+certutil -urlcache -f -split https://raw.githubusercontent.com/bin456789/reinstall/main/reinstall.bat
+```
 
-```bat
-reinstall.bat centos-7 (或其他操作，所有功能均可在 Windows 下使用)
+### 下载（国内）
+
+```batch
+certutil -urlcache -f -split https://ghps.cc/https://raw.githubusercontent.com/bin456789/reinstall/main/reinstall.bat
+```
+
+### 如果无法下载
+
+- 关闭 Windows Defender 实时保护
+
+- 系统的 SSL 根证书没更新
+
+  可用`链接另存为`，或者`远程桌面`复制以下两个文件
+
+  <https://raw.githubusercontent.com/bin456789/reinstall/main/reinstall.bat>
+
+  <https://raw.githubusercontent.com/bin456789/reinstall/main/reinstall.sh>
+
+### 使用
+
+可将 centos-7 换成其他，所有功能均可在 Windows 下使用
+
+```batch
+reinstall.bat centos-7
 ```
 
 ## Windows iso 安装
diff --git a/reinstall.bat b/reinstall.bat
index 4da42be..e01248d 100644
--- a/reinstall.bat
+++ b/reinstall.bat
@@ -12,26 +12,33 @@ cd /d %~dp0
 :: 检查是否有管理员权限
 openfiles 1>nul 2>&1
 if not !errorlevel! == 0 (
-    echo "Please run as administrator!"
+    echo Please run as administrator^^!
     exit 1
 )
 
+:: 检查是否国内
+if not exist %tmp%\geoip (
+    call :download https://www.cloudflare.com/cdn-cgi/trace %tmp%\geoip
+)
+findstr /c:"loc=CN" %tmp%\geoip >nul
+if !errorlevel! == 0 (
+    set mirror=http://mirror.nju.edu.cn
+
+    echo !confhome! | findstr /c:"://raw.githubusercontent.com/" >nul
+    if !errorlevel! == 0 (
+        set confhome=https://ghps.cc/!confhome!
+    )
+) else (
+    set mirror=http://mirrors.kernel.org
+)
+
+
 :: pkgs 改动了才重新运行 Cygwin 安装程序
 set pkgs="curl,cpio,p7zip,bind-utils,ipcalc"
 set tags=%tmp%\cygwin-installed-!pkgs!
 if not exist !tags! (
-    :: 检查是否国内
-    :: 在括号里面，:: 下一行不能是空行!!!!!
-    call :download http://www.cloudflare.com/cdn-cgi/trace %tmp%\geoip "Check Location"
-    findstr "loc=CN" %tmp%\geoip >nul
-    if !errorlevel! == 0 (
-        set host=http://mirror.nju.edu.cn
-    ) else (
-        set host=http://mirrors.kernel.org
-    )
-
     :: 检查32/64位
-    wmic os get osarchitecture | findstr 64 >nul
+    wmic os get osarchitecture | findstr /c:"64" >nul
     if !errorlevel! == 0 (
         set arch=x86_64
         set dir=/sourceware/cygwin
@@ -44,7 +51,7 @@ if not exist !tags! (
     call :download http://www.cygwin.com/setup-!arch!.exe %tmp%\setup-cygwin.exe "Download Cygwin"
 
     :: 安装 Cygwin
-    set site=!host!!dir!
+    set site=!mirror!!dir!
     %tmp%\setup-cygwin.exe --allow-unsupported-windows^
                             --quiet-mode^
                             --only-site^