diff --git a/flutter.sh b/flutter.sh
new file mode 100755
index 0000000..bf755b6
--- /dev/null
+++ b/flutter.sh
@@ -0,0 +1,41 @@
+#!/bin/bash
+# requires: curl, unzip, gsutil, jq
+
+DEST_DIR="${TUNASYNC_WORKING_DIR}"
+STABLE_VERSION_ENGINE=true
+
+gsutil rsync -d -C -r -x '(1\..+/|\d{5}/|.+/api-docs)' gs://dart-archive/channels/stable/release \
+    "${DEST_DIR}/dart-archive/channels/stable/release"
+gsutil rsync -d -C -r -x '(dev|beta)' gs://flutter_infra/releases \
+    "${DEST_DIR}/flutter_infra/releases"
+
+
+if [[ "$STABLE_VERSION_ENGINE" == "true" ]];then
+    for i in ${DEST_DIR}/flutter_infra/releases/stable/macos/*.zip; do
+        engine_version=$(unzip -p "$i" flutter/bin/internal/engine.version)
+        echo "======== name ${i##*/}, engine version ($engine_version) ========"
+        path=flutter_infra/flutter/$engine_version
+        mkdir -p "${DEST_DIR}/$path" 2>/dev/null || true
+        gsutil -m rsync -d -C -r "gs://$path" "${DEST_DIR}/$path"
+    done
+else
+    curl -H "Authorization: token $GITHUB_TOKEN" "https://api.github.com/repos/flutter/flutter/tags" | \
+        jq -r '.[]| [.name]| @tsv' | \
+        while IFS=$'\t' read -r name; do
+            engine_version=$(curl "https://raw.githubusercontent.com/flutter/flutter/$name/bin/internal/engine.version")
+            echo "======== tag $name, engine version ($engine_version) ========"
+            path=flutter_infra/flutter/$engine_version
+            mkdir -p "${DEST_DIR}/$path" 2>/dev/null || true
+            gsutil -m rsync -d -C -r "gs://$path" "${DEST_DIR}/$path"
+        done
+fi
+
+exit 0
+
+for path in "flutter_infra/ios-usb-dependencies" \
+            "flutter_infra/flutter/fonts" \
+            "flutter_infra/gradle-wrapper"
+do
+    mkdir -p "${DEST_DIR}/$path" 2>/dev/null || true
+    gsutil rsync -d -C -r "gs://$path" "${DEST_DIR}/$path"
+done
\ No newline at end of file
diff --git a/tensorflow.sh b/tensorflow.sh
deleted file mode 100755
index f5e58cf..0000000
--- a/tensorflow.sh
+++ /dev/null
@@ -1,3 +0,0 @@
-#!/bin/bash
-# requires: wget, python3
-exit 0;