diff --git a/README.md b/README.md
index 7b74d81..a9062a3 100644
--- a/README.md
+++ b/README.md
@@ -34,6 +34,7 @@
 # 使用方法
 ## 使用已构建版本
 - 从[GitHub Release](https://github.com/ix64/unlock-music/releases/latest)下载已构建的版本
+    - 本地使用请下载`legacy版本`（`modern版本`只能通过**http/https协议**访问）
 - 解压缩后即可部署或本地使用（**请勿直接运行源代码**）
 
 ## 自行构建
diff --git a/src/App.vue b/src/App.vue
index b5fba53..2295a70 100644
--- a/src/App.vue
+++ b/src/App.vue
@@ -100,16 +100,16 @@
                 } catch (e) {
                 }
                 if ((!!updateInfo && process.env.NODE_ENV === 'production') && (!!updateInfo.HttpsFound ||
-                    (!!updateInfo.Found && window.location.protocol !== "https:"))) {
-                    this.$notify.warning({
-                        title: '发现更新',
-                        message: '发现新版本 v' + updateInfo.Version +
-                            '<br/>更新详情：' + updateInfo.Detail +
-                            '<br/><a target="_blank" href="' + updateInfo.URL + '">获取更新</a>',
-                        dangerouslyUseHTMLString: true,
-                        duration: 15000,
-                        position: 'top-left'
-                    });
+                    (!!updateInfo.Found && document.location.protocol !== "https:"))) {
+                  this.$notify.warning({
+                    title: '发现更新',
+                    message: '发现新版本 v' + updateInfo.Version +
+                        '<br/>更新详情：' + updateInfo.Detail +
+                        '<br/><a target="_blank" href="' + updateInfo.URL + '">获取更新</a>',
+                    dangerouslyUseHTMLString: true,
+                    duration: 15000,
+                    position: 'top-left'
+                  });
                 } else {
                     this.$notify.info({
                         title: '离线使用',
diff --git a/src/decrypt/kgm.js b/src/decrypt/kgm.js
index fbcc416..62d915f 100644
--- a/src/decrypt/kgm.js
+++ b/src/decrypt/kgm.js
@@ -10,9 +10,14 @@ const KgmHeader = [
 const VprMaskDiff = [0x25, 0xDF, 0xE8, 0xA6, 0x75, 0x1E, 0x75, 0x0E,
     0x2F, 0x80, 0xF3, 0x2D, 0xB8, 0xB6, 0xE3, 0x11,
     0x00]
-const PreDefinedKey = "MoOtOiTvINGwd2E6n0E1i7L5t2IoOoNk"
 
 export async function Decrypt(file, raw_filename, raw_ext) {
+    if (document.location.protocol === "file:") {
+        return {
+            status: false,
+            message: "请使用<a target='_blank' href='https://github.com/ix64/unlock-music/wiki/其他音乐格式工具'>CLI版本</a>进行解锁"
+        }
+    }
     const oriData = new Uint8Array(await GetArrayBuffer(file));
     if (raw_ext === "vpr") {
         if (!IsBytesEqual(VprHeader, oriData.slice(0, 0x10)))
diff --git a/src/decrypt/ncm.js b/src/decrypt/ncm.js
index 8190c5e..9d43863 100644
--- a/src/decrypt/ncm.js
+++ b/src/decrypt/ncm.js
@@ -164,7 +164,9 @@ function getMetaData(dataView, fileBuffer, offset) {
     if (plainText.slice(0, labelIndex) === "dj") {
         result = result.mainMusic;
     }
-    if (!!result.albumPic) result.albumPic = result.albumPic.replace("http://", "https://");
+    if (!!result.albumPic && result.albumPic !== "")
+        result.albumPic = result.albumPic.replace("http://", "https://") + "?param=500y500";
+
     return {data: result, offset: offset};
 }