diff --git a/backend/unicorn2/src/main/resources/natives/windows_64/unicorn.dll b/backend/unicorn2/src/main/resources/natives/windows_64/unicorn.dll
index 9da46986e..4f896c9b7 100644
Binary files a/backend/unicorn2/src/main/resources/natives/windows_64/unicorn.dll and b/backend/unicorn2/src/main/resources/natives/windows_64/unicorn.dll differ
diff --git a/unidbg-android/src/test/java/com/test/BugPoc.java b/unidbg-android/src/test/java/com/test/BugPoc.java
new file mode 100644
index 000000000..39b333029
--- /dev/null
+++ b/unidbg-android/src/test/java/com/test/BugPoc.java
@@ -0,0 +1,50 @@
+package com.test;
+
+import com.github.unidbg.*;
+import com.github.unidbg.arm.backend.*;
+import com.github.unidbg.linux.android.AndroidEmulatorBuilder;
+import com.github.unidbg.linux.android.AndroidResolver;
+import com.github.unidbg.linux.android.dvm.VM;
+import com.github.unidbg.memory.Memory;
+import java.io.File;
+
+public class BugPoc {
+    private static AndroidEmulator emulator;
+    private static VM vm;
+
+    public static void poc()
+    {
+        Backend backend = BugPoc.emulator.getBackend();
+        backend.mem_map(0x20f000, 0x101000, 0);
+        backend.mem_protect(0x20f000, 0x2000, 3);
+        backend.mem_unmap(0x20f000, 0x101000);
+    }
+
+    public static void main(String[] args)
+    {
+        emulator = AndroidEmulatorBuilder
+                .for64Bit()
+                .addBackendFactory(new Unicorn2Factory(false))
+                .setProcessName("test")
+                .setRootDir(new File("unidbg-android/src/test/resources/VFS"))
+                .build();
+
+//        Memory memory = emulator.getMemory();
+//        memory.setLibraryResolver(new AndroidResolver(26));
+//        vm = emulator.createDalvikVM();
+//        vm.setVerbose(true);
+//        vm.loadLibrary(new File("unidbg-master\\unidbg-android\\target\\classes\\android\\sdk23\\lib64\\libc.so"),false);
+
+        Backend backend = emulator.getBackend();
+//        backend.mem_map(0x40000000, 0x100000, 5);
+//        backend.mem_map(0x400d0000, 0x20000, 3);
+//        backend.mem_map(0x400f0000, 0x10000, 5);
+        backend.mem_map(0, 0x100000, 0);
+
+        backend.mem_protect(0, 0x2000, 3);
+
+
+//        backend.mem_map(0x20f000, 0x101000, 0);
+//        backend.mem_protect(0x20f000, 0x2000, 3);
+    }
+}