diff --git a/app/src/main/java/com/cobo/cold/selfcheck/SecurityCheck.java b/app/src/main/java/com/cobo/cold/selfcheck/SecurityCheck.java
index 8f92f43..434451f 100644
--- a/app/src/main/java/com/cobo/cold/selfcheck/SecurityCheck.java
+++ b/app/src/main/java/com/cobo/cold/selfcheck/SecurityCheck.java
@@ -106,7 +106,10 @@ public class SecurityCheck {
         Log.i(TAG, "check firmware status");
         try {
             final Callable<Packet> callable = new BlockingCallable(
-                    new Packet.Builder(CONSTANTS.METHODS.GET_FIRMWARE_STATUS).setRetryTimes(2).build());
+                    new Packet.Builder(CONSTANTS.METHODS.GET_FIRMWARE_STATUS)
+                            .setRetryTimes(5)
+                            .setTimeout(5)
+                            .build());
             final Packet result = callable.call();
             final Payload payload = result.getPayload(CONSTANTS.TAGS.FIRMWARE_STATUS);
 
@@ -143,7 +146,9 @@ public class SecurityCheck {
         Log.i(TAG, "check firmware status");
         try {
             final Callable<Packet> callable = new BlockingCallable(
-                    new Packet.Builder(CONSTANTS.METHODS.GET_FIRMWARE_STATUS).setRetryTimes(2).build());
+                    new Packet.Builder(CONSTANTS.METHODS.GET_FIRMWARE_STATUS)
+                            .setTimeout(5)
+                            .setRetryTimes(5).build());
             final Packet result = callable.call();
             final Payload payload = result.getPayload(CONSTANTS.TAGS.FIRMWARE_STATUS);
 
diff --git a/app/src/main/java/com/cobo/cold/ui/fragment/setting/ChooseWatchWalletFragment.java b/app/src/main/java/com/cobo/cold/ui/fragment/setting/ChooseWatchWalletFragment.java
index 60adc96..1fc1262 100644
--- a/app/src/main/java/com/cobo/cold/ui/fragment/setting/ChooseWatchWalletFragment.java
+++ b/app/src/main/java/com/cobo/cold/ui/fragment/setting/ChooseWatchWalletFragment.java
@@ -100,7 +100,7 @@ public class ChooseWatchWalletFragment extends ListPreferenceFragment {
 
     @Override
     protected String defaultValue() {
-        return WatchWallet.ELECTRUM.getWalletId();
+        return WatchWallet.COBO.getWalletId();
     }
 
     @Override
diff --git a/app/src/main/java/com/cobo/cold/viewmodel/WatchWallet.java b/app/src/main/java/com/cobo/cold/viewmodel/WatchWallet.java
index f498b24..f179c9b 100644
--- a/app/src/main/java/com/cobo/cold/viewmodel/WatchWallet.java
+++ b/app/src/main/java/com/cobo/cold/viewmodel/WatchWallet.java
@@ -47,8 +47,8 @@ public enum WatchWallet {
 
     public static WatchWallet getWatchWallet(Context context) {
         String wallet = Utilities.getPrefs(context)
-                .getString(SETTING_CHOOSE_WATCH_WALLET, ELECTRUM.getWalletId());
-        WatchWallet selectWatchWallet = ELECTRUM;
+                .getString(SETTING_CHOOSE_WATCH_WALLET, COBO.getWalletId());
+        WatchWallet selectWatchWallet = COBO;
         for (WatchWallet watchWallet: WatchWallet.values()) {
             if (watchWallet.getWalletId().equals(wallet)) {
                 selectWatchWallet = watchWallet;
diff --git a/app/src/main/res/values-zh-rCN/strings.xml b/app/src/main/res/values-zh-rCN/strings.xml
index 898258f..52adbb9 100644
--- a/app/src/main/res/values-zh-rCN/strings.xml
+++ b/app/src/main/res/values-zh-rCN/strings.xml
@@ -379,6 +379,7 @@
     <string name="txid">交易ID</string>
     <string name="skip_export">已导出 / 暂不导出</string>
     <string name="choose_watch_only_wallet">选择观察钱包</string>
+    <string name="watch_only_wallet">观察钱包</string>
     <string name="switch_watch_only_wallet_guide">切换观察钱包可前往【菜单--设置--选择观察钱包】</string>
     <string name="wallet_info">钱包信息</string>
     <string name="wallet">钱包：</string>
diff --git a/app/src/main/res/values/strings.xml b/app/src/main/res/values/strings.xml
index bde7fb2..6f1c9b0 100755
--- a/app/src/main/res/values/strings.xml
+++ b/app/src/main/res/values/strings.xml
@@ -439,6 +439,7 @@
     <string name="txid">TxID</string>
     <string name="skip_export">Exported / Export Later</string>
     <string name="choose_watch_only_wallet">Select a watch-only wallet</string>
+    <string name="watch_only_wallet">Watch-only Wallet</string>
     <string name="switch_watch_only_wallet_guide">Go to Menu > Settings > Select Watch-Only Wallet</string>
     <string name="wallet_info">Wallet Info</string>
     <string name="wallet">Key Fingerprint:</string>
diff --git a/app/src/main/res/xml/main_preference.xml b/app/src/main/res/xml/main_preference.xml
index 74f7220..059bf9b 100644
--- a/app/src/main/res/xml/main_preference.xml
+++ b/app/src/main/res/xml/main_preference.xml
@@ -20,7 +20,7 @@
 
     <com.cobo.cold.ui.preference.SimplePreference
         android:key="setting_choose_watch_only_wallet"
-        android:title="@string/choose_watch_only_wallet" />
+        android:title="@string/watch_only_wallet" />
     <com.cobo.cold.ui.preference.SimplePreference
         android:key="setting_change_pwd"
         android:title="@string/change_password" />