diff --git a/docker/start.sh b/docker/start.sh
index 72b2f26..0c1cc4a 100755
--- a/docker/start.sh
+++ b/docker/start.sh
@@ -17,4 +17,12 @@ imports=$([ "$DISABLE_IMPORTS" = "true" ] && echo "--disable-imports" || echo ""
 
 exports=$([ "$DISABLE_EXPORTS" = "true" ] && echo "--disable-exports" || echo "")
 
-/root/ew/ew --path $directory --port $port --npps4 $npps4 $exports $imports $purge $hidden $https --global-android "$ANDROID_GLOBAL"  --japan-android "$ANDROID_JAPAN"  --global-ios "$IOS_GLOBAL"  --japan-ios "$IOS_JAPAN" --assets-url "$ASSET_URL" --max-time $maxTime
+asset_android_jp=$([ "$JP_ANDROID_ASSET_HASH" != "" ] && echo "--jp-android-asset-hash $JP_ANDROID_ASSET_HASH" || echo "")
+
+asset_ios_jp=$([ "$JP_IOS_ASSET_HASH" != "" ] && echo "--jp-ios-asset-hash $JP_IOS_ASSET_HASH" || echo "")
+
+asset_android_en=$([ "$EN_ANDROID_ASSET_HASH" != "" ] && echo "--en-android-asset-hash $EN_ANDROID_ASSET_HASH" || echo "")
+
+asset_ios_en=$([ "$EN_IOS_ASSET_HASH" != "" ] && echo "--en-ios-asset-hash $EN_IOS_ASSET_HASH" || echo "")
+
+/root/ew/ew --path $directory --port $port --npps4 $npps4 $asset_android_jp $asset_ios_jp $asset_android_en $asset_ios_en $exports $imports $purge $hidden $https --global-android "$ANDROID_GLOBAL"  --japan-android "$ANDROID_JAPAN"  --global-ios "$IOS_GLOBAL"  --japan-ios "$IOS_JAPAN" --assets-url "$ASSET_URL" --max-time $maxTime
diff --git a/src/main.rs b/src/main.rs
index 35178fe..ec10c24 100644
--- a/src/main.rs
+++ b/src/main.rs
@@ -77,7 +77,19 @@ pub struct Args {
     disable_imports: bool,
 
     #[arg(long, default_value_t = false, help = "Disable user account exports")]
-    disable_exports: bool
+    disable_exports: bool,
+
+    #[arg(long, default_value = "", help = "Asset hash for English iOS client.")]
+    en_ios_asset_hash: String,
+
+    #[arg(long, default_value = "", help = "Asset hash for JP iOS client.")]
+    jp_ios_asset_hash: String,
+
+    #[arg(long, default_value = "", help = "Asset hash for English Android client.")]
+    en_android_asset_hash: String,
+
+    #[arg(long, default_value = "", help = "Asset hash for JP Android client.")]
+    jp_android_asset_hash: String
 }
 
 #[actix_web::main]
diff --git a/src/router/global.rs b/src/router/global.rs
index cc2320a..8d96865 100644
--- a/src/router/global.rs
+++ b/src/router/global.rs
@@ -18,6 +18,37 @@ pub const ASSET_VERSION_JP:       &str = "4c921d2443335e574a82e04ec9ea243c";
 pub const ASSET_HASH_ANDROID_JP:  &str = "67f8f261c16b3cca63e520a25aad6c1c";
 pub const ASSET_HASH_IOS_JP:      &str = "b8975be8300013a168d061d3fdcd4a16";
 
+pub fn get_asset_hash(asset_version: String, android: bool) -> String {
+    let args = crate::get_args();
+    if asset_version == ASSET_VERSION_JP {
+        if android {
+            if args.jp_android_asset_hash != String::new() {
+                args.jp_android_asset_hash
+            } else {
+                ASSET_HASH_ANDROID_JP.to_string()
+            }
+        } else {
+            if args.jp_ios_asset_hash != String::new() {
+                args.jp_ios_asset_hash
+            } else {
+                ASSET_HASH_IOS_JP.to_string()
+            }
+        }
+    } else if android {
+        if args.en_android_asset_hash != String::new() {
+            args.en_android_asset_hash
+        } else {
+            ASSET_HASH_ANDROID.to_string()
+        }
+    } else {
+        if args.en_ios_asset_hash != String::new() {
+            args.en_ios_asset_hash
+        } else {
+            ASSET_HASH_IOS.to_string()
+        }
+    }
+}
+
 pub fn create_token() -> String {
     format!("{}", Uuid::now_v7())
 }
diff --git a/src/router/start.rs b/src/router/start.rs
index d111c4e..9d55ba7 100644
--- a/src/router/start.rs
+++ b/src/router/start.rs
@@ -13,18 +13,7 @@ fn get_asset_hash(req: &HttpRequest, body: &JsonValue) -> String {
     let platform = req.headers().get("aoharu-platform").unwrap_or(&blank_header).to_str().unwrap_or("");
     let android = !platform.to_lowercase().contains("iphone");
     
-    let hash = if body["asset_version"] == global::ASSET_VERSION_JP {
-        if android {
-            global::ASSET_HASH_ANDROID_JP
-        } else {
-            global::ASSET_HASH_IOS_JP
-        }
-    } else if android {
-        global::ASSET_HASH_ANDROID
-    } else {
-        global::ASSET_HASH_IOS
-    };
-    hash.to_string()
+    global::get_asset_hash(body["asset_version"].to_string(), android)
 }
 
 pub fn asset_hash(req: HttpRequest, body: String) -> Option<JsonValue> {