diff --git a/manager/proguard-rules-debug.pro b/manager/proguard-rules-debug.pro
index e9caf63..7013204 100644
--- a/manager/proguard-rules-debug.pro
+++ b/manager/proguard-rules-debug.pro
@@ -1 +1,7 @@
 -dontobfuscate
+-keep class com.beust.jcommander.** { *; }
+-keep class org.lsposed.lspatch.Patcher$Options { *; }
+-keep class org.lsposed.lspatch.share.PatchConfig { *; }
+-keepclassmembers class org.lsposed.patch.LSPatch {
+    private <fields>;
+}
diff --git a/manager/src/main/java/org/lsposed/lspatch/Patcher.kt b/manager/src/main/java/org/lsposed/lspatch/Patcher.kt
index f8ab240..964f466 100644
--- a/manager/src/main/java/org/lsposed/lspatch/Patcher.kt
+++ b/manager/src/main/java/org/lsposed/lspatch/Patcher.kt
@@ -57,7 +57,7 @@ object Patcher {
                 if (it.name?.endsWith(PATCH_FILE_SUFFIX) == true) it.delete()
             }
             lspApp.tmpApkDir.walk()
-                .filter { it.isFile }
+                .filter { it.name.endsWith(PATCH_FILE_SUFFIX) }
                 .forEach { apk ->
                     val file = root.createFile("application/vnd.android.package-archive", apk.name)
                         ?: throw IOException("Failed to create output file")
diff --git a/share/java/src/template/java/org.lsposed.lspatch.share/LSPConfig.java b/share/java/src/template/java/org.lsposed.lspatch.share/LSPConfig.java
index 0e8c497..3d0e823 100644
--- a/share/java/src/template/java/org.lsposed.lspatch.share/LSPConfig.java
+++ b/share/java/src/template/java/org.lsposed.lspatch.share/LSPConfig.java
@@ -2,14 +2,24 @@ package org.lsposed.lspatch.share;
 
 public class LSPConfig {
 
-    public static final LSPConfig instance = new LSPConfig();
+    public static final LSPConfig instance = factory();
 
-    public final int API_CODE = ${apiCode};
-    public final int VERSION_CODE = ${verCode};
-    public final String VERSION_NAME = "${verName}";
-    public final int CORE_VERSION_CODE = ${coreVerCode};
-    public final String CORE_VERSION_NAME = "${coreVerName}";
+    public int API_CODE;
+    public int VERSION_CODE;
+    public String VERSION_NAME;
+    public int CORE_VERSION_CODE;
+    public String CORE_VERSION_NAME;
 
     private LSPConfig() {
     }
+
+    private static LSPConfig factory() {
+        LSPConfig config = new LSPConfig();
+        config.API_CODE = ${apiCode};
+        config.VERSION_CODE = ${verCode};
+        config.VERSION_NAME = "${verName}";
+        config.CORE_VERSION_CODE = ${coreVerCode};
+        config.CORE_VERSION_NAME = "${coreVerName}";
+        return config;
+    }
 }