diff --git a/src/c#/GeneralUpdate.Core/Bootstrap/GeneralClientOSS.cs b/src/c#/GeneralUpdate.Core/Bootstrap/GeneralClientOSS.cs
index 6d2bbcaf..93367ff9 100644
--- a/src/c#/GeneralUpdate.Core/Bootstrap/GeneralClientOSS.cs
+++ b/src/c#/GeneralUpdate.Core/Bootstrap/GeneralClientOSS.cs
@@ -15,7 +15,7 @@
 
 namespace GeneralUpdate.Core;
 
-public sealed class GeneralClientOSS
+[Obsolete("Use GeneralUpdateBootstrap with AppType=AppType.OSS instead.")] public sealed class GeneralClientOSS
 {
     private GeneralClientOSS() { }
 
diff --git a/src/c#/GeneralUpdate.Core/Bootstrap/GeneralUpdateOSS.cs b/src/c#/GeneralUpdate.Core/Bootstrap/GeneralUpdateOSS.cs
index 06bb7a02..c315b0b3 100644
--- a/src/c#/GeneralUpdate.Core/Bootstrap/GeneralUpdateOSS.cs
+++ b/src/c#/GeneralUpdate.Core/Bootstrap/GeneralUpdateOSS.cs
@@ -9,6 +9,7 @@
 
 namespace GeneralUpdate.Core
 {
+    [Obsolete("Use GeneralUpdateBootstrap with AppType=AppType.OSS instead. See UpdateOptions.AppType.")]
     public sealed class GeneralUpdateOSS
     {
         private GeneralUpdateOSS() { }
diff --git a/src/c#/GeneralUpdate.Core/Configuration/UpdateOptions.cs b/src/c#/GeneralUpdate.Core/Configuration/UpdateOptions.cs
index 77b05d32..85cd5733 100644
--- a/src/c#/GeneralUpdate.Core/Configuration/UpdateOptions.cs
+++ b/src/c#/GeneralUpdate.Core/Configuration/UpdateOptions.cs
@@ -44,6 +44,10 @@ public static class UpdateOptions
         public static readonly UpdateOption<string?> ProductId = UpdateOption.ValueOf<string?>("PRODUCTID");
         public static readonly UpdateOption<string?> PermissionScript = UpdateOption.ValueOf<string?>("PERMISSIONSCRIPT");
         public static readonly UpdateOption<string?> Scheme = UpdateOption.ValueOf<string?>("SCHEME");
-        public static readonly UpdateOption<string?> Token = UpdateOption.ValueOf<string?>("TOKEN");
+        public static readonly UpdateOption<string?> Token = UpdateOption.ValueOf<string?("TOKEN");
+
+        // ═══ OSS ═══
+        public static readonly UpdateOption<int?> OSSProvider = UpdateOption.ValueOf<int?>("OSSPROVIDER");
+        public static readonly UpdateOption<string?> OSSBucketRegion = UpdateOption.ValueOf<string?>("OSSBUCKETREGION");
     }
 }