diff --git a/app/src/main/java/com/cobo/cold/callables/RequestUpdateCallable.java b/app/src/main/java/com/cobo/cold/callables/RequestUpdateCallable.java
index 5182fda..dce0c0e 100644
--- a/app/src/main/java/com/cobo/cold/callables/RequestUpdateCallable.java
+++ b/app/src/main/java/com/cobo/cold/callables/RequestUpdateCallable.java
@@ -68,7 +68,6 @@ public class RequestUpdateCallable implements Callable<Boolean> {
     }
 
     private boolean updating() throws Exception {
-        final byte[] checksum = calculateChecksum(updateData);
         final byte[] readBuffer = new byte[CONSTANTS.CONFIG.PAGE_SIZE];
         try (InputStream inputStream = new ByteArrayInputStream(updateData)) {
             // skip metadata
@@ -89,9 +88,6 @@ public class RequestUpdateCallable implements Callable<Boolean> {
                             .addBytePayload(CONSTANTS.TAGS.UPDATING_PACKAGE_TYPE, type)
                             .addHexPayload(CONSTANTS.TAGS.CURRENT_PASSWORD, password)
                             .addBytesPayload(CONSTANTS.TAGS.UPDATING_PACKAGE, availableBuffer);
-                    if (type == TYPE_PACKAGE_END) {
-                        builder.addBytesPayload(CONSTANTS.TAGS.UPDATING_CHECKSUM, checksum);
-                    }
                     final Callable callable = new BlockingCallable(builder.build());
                     try {
                         Log.w(TAG, String.format("write the %sth package", packageIndex));
diff --git a/app/src/main/java/com/cobo/cold/callables/UpdateCallable.java b/app/src/main/java/com/cobo/cold/callables/UpdateCallable.java
index c97e98d..6ccb725 100644
--- a/app/src/main/java/com/cobo/cold/callables/UpdateCallable.java
+++ b/app/src/main/java/com/cobo/cold/callables/UpdateCallable.java
@@ -106,8 +106,6 @@ public class UpdateCallable implements Callable<Void> {
     }
 
     private void updating() throws Exception {
-        final byte[] checksum = calculateChecksum(mUpdateData);
-
         final byte[] readBuffer = new byte[CONSTANTS.CONFIG.PAGE_SIZE];
 
         try (InputStream inputStream = new ByteArrayInputStream(mUpdateData)) {
@@ -124,7 +122,7 @@ public class UpdateCallable implements Callable<Void> {
                 final byte[] availableBuffer = fitBuffer(readBuffer, read);
                 final int type = calculatePackageType(packageSize, readPosition, read);
                 for (int i = 1; i <= PACKET_RETRY_TIMES; ++i) {
-                    if (writeUpdateBytes(checksum, packageIndex, availableBuffer, type, i)) break;
+                    if (writeUpdateBytes(packageIndex, availableBuffer, type, i)) break;
                 }
                 readPosition += read;
                 ++packageIndex;
@@ -154,17 +152,13 @@ public class UpdateCallable implements Callable<Void> {
         return false;
     }
 
-    private boolean writeUpdateBytes(byte[] checksum, int packageIndex, byte[] availableBuffer, int type, int i) {
+    private boolean writeUpdateBytes(int packageIndex, byte[] availableBuffer, int type, int i) {
         boolean writeSuccess = true;
         final Packet.Builder builder = new Packet.Builder(CONSTANTS.METHODS.WRITE_UPDATE_BYTES)
                 .addBytePayload(CONSTANTS.TAGS.UPDATING_PACKAGE_TYPE, type)
                 .addHexPayload(CONSTANTS.TAGS.CURRENT_PASSWORD, password)
                 .addBytesPayload(CONSTANTS.TAGS.UPDATING_PACKAGE, availableBuffer);
 
-        if (type == TYPE_PACKAGE_END) {
-            builder.addBytesPayload(CONSTANTS.TAGS.UPDATING_CHECKSUM, checksum);
-        }
-
         final Callable callable = new BlockingCallable(builder.build());
 
         try {
diff --git a/coinlib/src/main/java/com/cobo/coinlib/coins/BTC/Btc.java b/coinlib/src/main/java/com/cobo/coinlib/coins/BTC/Btc.java
index 31846d4..5e70923 100644
--- a/coinlib/src/main/java/com/cobo/coinlib/coins/BTC/Btc.java
+++ b/coinlib/src/main/java/com/cobo/coinlib/coins/BTC/Btc.java
@@ -178,6 +178,7 @@ public class Btc extends AbsCoin {
             StringBuilder paths = new StringBuilder();
             for (int i = 0; i < inputs.length(); i++) {
                 JSONObject input = inputs.getJSONObject(i);
+                input.put("bip32Derivation",new JSONArray());
                 String path = input.getString("ownerKeyPath");
                 checkHdPath(path, false);
                 paths.append(path).append(SEPARATOR);