diff --git a/patch/src/main/java/org/lsposed/patch/LSPatch.java b/patch/src/main/java/org/lsposed/patch/LSPatch.java
index 50e766b..7cd74c5 100644
--- a/patch/src/main/java/org/lsposed/patch/LSPatch.java
+++ b/patch/src/main/java/org/lsposed/patch/LSPatch.java
@@ -13,6 +13,7 @@ import com.android.tools.build.apkzlib.zip.ZFile;
 import com.android.tools.build.apkzlib.zip.ZFileOptions;
 import com.beust.jcommander.JCommander;
 import com.beust.jcommander.Parameter;
+import com.beust.jcommander.ParameterException;
 import com.google.gson.Gson;
 import com.wind.meditor.core.ManifestEditor;
 import com.wind.meditor.property.AttributeItem;
@@ -72,6 +73,9 @@ public class LSPatch {
     @Parameter(names = {"-l", "--sigbypasslv"}, description = "Signature bypass level. 0 (disable), 1 (pm), 2 (pm+openat). default 0")
     private int sigbypassLevel = 0;
 
+    @Parameter(names = {"-k", "--keystore"}, arity = 4, description = "Set custom signature keystore. Followed by 4 arguments: keystore path, keystore password, keystore alias, keystore alias password")
+    private List<String> keystoreArgs = Arrays.asList(null, "123456", "key0", "123456");
+
     @Parameter(names = {"--v1"}, arity = 1, description = "Sign with v1 signature")
     private boolean v1 = false;
 
@@ -117,38 +121,40 @@ public class LSPatch {
     private final Logger logger;
 
     public LSPatch(Logger logger, String... args) {
-        jCommander = JCommander.newBuilder()
-                .addObject(this)
-                .build();
-        jCommander.parse(args);
+        jCommander = JCommander.newBuilder().addObject(this).build();
+        try {
+            jCommander.parse(args);
+        } catch (ParameterException e) {
+            logger.e(e.getMessage() + "\n");
+            help = true;
+        }
+        if (apkPaths == null || apkPaths.isEmpty()) {
+            logger.e("No apk specified\n");
+            help = true;
+        }
+        if (!modules.isEmpty() && useManager) {
+            logger.e("Should not use --embed and --manager at the same time\n");
+            help = true;
+        }
+
         this.logger = logger;
         logger.verbose = verbose;
     }
 
     public static void main(String... args) throws IOException {
-        LSPatch lsPatch = new LSPatch(new JavaLogger(), args);
+        LSPatch lspatch = new LSPatch(new JavaLogger(), args);
+        if (lspatch.help) {
+            lspatch.jCommander.usage();
+            return;
+        }
         try {
-            lsPatch.doCommandLine();
+            lspatch.doCommandLine();
         } catch (PatchError e) {
             e.printStackTrace(System.err);
         }
     }
 
     public void doCommandLine() throws PatchError, IOException {
-        if (help) {
-            jCommander.usage();
-            return;
-        }
-        if (apkPaths == null || apkPaths.isEmpty()) {
-            jCommander.usage();
-            return;
-        }
-
-        if (!modules.isEmpty() && useManager) {
-            jCommander.usage();
-            return;
-        }
-
         for (var apk : apkPaths) {
             File srcApkFile = new File(apk).getAbsoluteFile();
 
@@ -181,13 +187,20 @@ public class LSPatch {
              var srcZFile = dstZFile.addNestedZip((ignore) -> ORIGINAL_APK_ASSET_PATH, srcApkFile, false)) {
 
             // sign apk
-            logger.i("Register apk signer...");
             try {
                 var keyStore = KeyStore.getInstance(KeyStore.getDefaultType());
-                try (var is = getClass().getClassLoader().getResourceAsStream("assets/keystore")) {
-                    keyStore.load(is, "123456".toCharArray());
+                if (keystoreArgs.get(0) == null) {
+                    logger.i("Register apk signer with default keystore...");
+                    try (var is = getClass().getClassLoader().getResourceAsStream("assets/keystore")) {
+                        keyStore.load(is, keystoreArgs.get(1).toCharArray());
+                    }
+                } else {
+                    logger.i("Register apk signer with custom keystore...");
+                    try (var is = new FileInputStream(keystoreArgs.get(0))) {
+                        keyStore.load(is, keystoreArgs.get(1).toCharArray());
+                    }
                 }
-                var entry = (KeyStore.PrivateKeyEntry) keyStore.getEntry("key0", new KeyStore.PasswordProtection("123456".toCharArray()));
+                var entry = (KeyStore.PrivateKeyEntry) keyStore.getEntry(keystoreArgs.get(2), new KeyStore.PasswordProtection(keystoreArgs.get(3).toCharArray()));
                 new SigningExtension(SigningOptions.builder()
                         .setMinSdkVersion(28)
                         .setV1SigningEnabled(v1)
@@ -292,7 +305,9 @@ public class LSPatch {
                 return false;
             });
 
-            embedModules(dstZFile);
+            if (!useManager) {
+                embedModules(dstZFile);
+            }
 
             // create zip link
             logger.d("Creating nested apk link...");