diff --git a/.github/changes/v1.0.3.md b/.github/changes/v1.0.3.md
index d00db21..2214867 100644
--- a/.github/changes/v1.0.3.md
+++ b/.github/changes/v1.0.3.md
@@ -24,3 +24,4 @@
 ### 修复
 
 - 服务商返回结果无法识别时，失败原因显示为完整说明，而不是英文代码。
+- iOS 安装包的主程序信息（Info.plist）现在位于压缩包最前面，修复部分签名 / 安装工具提示「未得到可用的主包」、无法导入的问题。
diff --git a/.github/workflows/ios-unsigned.yml b/.github/workflows/ios-unsigned.yml
index 2552107..79a9f1c 100644
--- a/.github/workflows/ios-unsigned.yml
+++ b/.github/workflows/ios-unsigned.yml
@@ -55,10 +55,10 @@ jobs:
         run: |
           ARCHIVE="$RUNNER_TEMP/App.xcarchive"
           VERSION=$(node -p "require('./app.json').expo.version")
-          cd "$RUNNER_TEMP"
-          rm -rf Payload && mkdir Payload
-          cp -R "$ARCHIVE"/Products/Applications/*.app Payload/
-          zip -qry "AIUsage-$VERSION-unsigned.ipa" Payload
+          APP=$(ls -d "$ARCHIVE"/Products/Applications/*.app | head -1)
+          # main Info.plist and executable first: some sideloading tools only scan the head of
+          # the archive for the main bundle (see scripts/package-ipa.py)
+          python3 scripts/package-ipa.py "$APP" "$RUNNER_TEMP/AIUsage-$VERSION-unsigned.ipa"
           echo "IPA=$RUNNER_TEMP/AIUsage-$VERSION-unsigned.ipa" >> "$GITHUB_ENV"
           ls -lh "$RUNNER_TEMP"/*.ipa
 
diff --git a/scripts/package-ipa.py b/scripts/package-ipa.py
new file mode 100644
index 0000000..17fef6d
--- /dev/null
+++ b/scripts/package-ipa.py
@@ -0,0 +1,95 @@
+"""Package an .app bundle into an .ipa with a predictable, tool-friendly layout.
+
+    python3 scripts/package-ipa.py <path/to/App.app> <out.ipa>
+
+Some sideloading and re-signing tools find the main bundle by scanning the archive's local
+headers from the start and give up after a while, so `Payload/<App>.app/Info.plist` buried near
+the end (where a plain `zip -r` tends to put it) reads as "no main bundle". This writes:
+
+1. `Payload/` and `Payload/<App>.app/`
+2. the main `Info.plist`, then the main executable (named by CFBundleExecutable)
+3. everything else, directories before their contents, in sorted order
+
+Entries carry Unix permissions and no platform-specific extra fields; symlinks are stored as links.
+"""
+
+import os
+import plistlib
+import stat
+import sys
+import zipfile
+
+
+def add_dir(zf: zipfile.ZipFile, arcname: str, mode: int) -> None:
+    info = zipfile.ZipInfo(arcname.rstrip('/') + '/')
+    info.create_system = 3
+    info.external_attr = (stat.S_IFDIR | (mode & 0o7777)) << 16 | 0x10
+    zf.writestr(info, b'')
+
+
+def add_path(zf: zipfile.ZipFile, path: str, arcname: str) -> None:
+    st = os.lstat(path)
+    if stat.S_ISLNK(st.st_mode):
+        info = zipfile.ZipInfo(arcname)
+        info.create_system = 3
+        info.external_attr = (stat.S_IFLNK | 0o777) << 16
+        zf.writestr(info, os.readlink(path))
+        return
+    info = zipfile.ZipInfo.from_file(path, arcname)
+    info.create_system = 3
+    info.external_attr = (stat.S_IFREG | (st.st_mode & 0o7777)) << 16
+    info.compress_type = zipfile.ZIP_DEFLATED
+    with open(path, 'rb') as f:
+        zf.writestr(info, f.read(), compress_type=zipfile.ZIP_DEFLATED, compresslevel=9)
+
+
+def main(app: str, out: str) -> None:
+    app = os.path.abspath(app.rstrip('/'))
+    name = os.path.basename(app)
+    if not name.endswith('.app') or not os.path.isfile(os.path.join(app, 'Info.plist')):
+        sys.exit(f'not an app bundle with an Info.plist: {app}')
+    with open(os.path.join(app, 'Info.plist'), 'rb') as f:
+        executable = plistlib.load(f).get('CFBundleExecutable')
+
+    root = f'Payload/{name}'
+    first = ['Info.plist'] + ([executable] if executable else [])
+    written = set()
+
+    with zipfile.ZipFile(out, 'w', zipfile.ZIP_DEFLATED, allowZip64=False) as zf:
+        add_dir(zf, 'Payload/', 0o755)
+        add_dir(zf, root, os.stat(app).st_mode)
+        for rel in first:
+            path = os.path.join(app, rel)
+            if os.path.lexists(path):
+                add_path(zf, path, f'{root}/{rel}')
+                written.add(rel)
+        for dirpath, dirnames, filenames in os.walk(app):
+            dirnames.sort()
+            rel_dir = os.path.relpath(dirpath, app)
+            if rel_dir != '.':
+                add_dir(zf, f'{root}/{rel_dir.replace(os.sep, "/")}', os.stat(dirpath).st_mode)
+            for fn in sorted(filenames):
+                rel = fn if rel_dir == '.' else f'{rel_dir}/{fn}'.replace(os.sep, '/')
+                if rel in written:
+                    continue
+                add_path(zf, os.path.join(dirpath, fn), f'{root}/{rel}')
+            # symlinked directories are walked as links, not followed
+            for d in list(dirnames):
+                full = os.path.join(dirpath, d)
+                if os.path.islink(full):
+                    rel = d if rel_dir == '.' else f'{rel_dir}/{d}'.replace(os.sep, '/')
+                    add_path(zf, full, f'{root}/{rel}')
+                    dirnames.remove(d)
+
+    with zipfile.ZipFile(out) as zf:
+        bad = zf.testzip()
+        if bad:
+            sys.exit(f'corrupt entry: {bad}')
+        names = zf.namelist()
+    print(f'{out}: {len(names)} entries; first: {names[:4]}')
+
+
+if __name__ == '__main__':
+    if len(sys.argv) != 3:
+        sys.exit(__doc__)
+    main(sys.argv[1], sys.argv[2])