diff --git a/lib/certificate_detail.dart b/lib/certificate_detail.dart
index b2394c5..72f4319 100644
--- a/lib/certificate_detail.dart
+++ b/lib/certificate_detail.dart
@@ -68,7 +68,12 @@ class CertificateDetail extends StatelessWidget {
                       Text(data.subject[X509Utils.DN['countryName']] ?? ''),
                       SizedBox(height: 10),
                       Text('Serial number:'),
-                      Text(data.serialNumber?.toString() ?? ''),
+                      Text(StringUtils.addCharAtPosition(
+                          data.serialNumber?.toRadixString(16)?.toUpperCase() ??
+                              '',
+                          ' ',
+                          2,
+                          repeat: true)),
                       SizedBox(height: 20),
                       Text('Issued by:',
                           style: TextStyle(fontWeight: FontWeight.bold)),
@@ -145,7 +150,7 @@ class CertificateDetail extends StatelessWidget {
       _launchAndroidIntent();
     } else {
       var result = distruster.distrust(cert);
-      if (result.stderr.isEmpty) {
+      if (result.stderr.isEmpty && result.exitCode > 0) {
         Navigator.pop(ctx);
       } else {
         showDialog(
@@ -153,8 +158,10 @@ class CertificateDetail extends StatelessWidget {
             builder: (_) => AlertDialog(
                   title:
                       Text('Failed to distrust ' + getTitle(cert.data) + '!'),
-                  content: Text('Error: ' +
+                  content: SelectableText('Error: ' +
                       result.stderr +
+                      ' ' +
+                      result.stdout +
                       '\n\n' +
                       distruster.getManualInstruction(cert)),
                   actions: [
diff --git a/lib/main.dart b/lib/main.dart
index 52a2d1d..916c845 100644
--- a/lib/main.dart
+++ b/lib/main.dart
@@ -101,7 +101,7 @@ class _MyAppState extends State<MyApp> {
   void _showAboutDialog(BuildContext ctx) {
     showAboutDialog(
         context: ctx,
-        applicationVersion: '1.2.0+3',
+        applicationVersion: '1.3.0+4',
         applicationIcon: Image.asset('images/logo.png'),
         children: [
           Text(
diff --git a/lib/windows_certificate_manager.dart b/lib/windows_certificate_manager.dart
index 05eda4d..83ba97c 100644
--- a/lib/windows_certificate_manager.dart
+++ b/lib/windows_certificate_manager.dart
@@ -168,7 +168,7 @@ class WindowsCertificateManager
   ProcessResult distrust(X509Certificate cert) {
     // Command doc: https://docs.microsoft.com/en-us/windows-server/administration/windows-commands/certutil#-revoke
     return Process.runSync(
-        'CertUtil', ['-revoke', cert.data.serialNumber.toString()]);
+        'CertUtil', ['-revoke', cert.data.serialNumber.toRadixString(16)]);
   }
 
   @override
@@ -177,7 +177,7 @@ class WindowsCertificateManager
             '1. Close CertainTLS and re-run it as root or \n'
             '2. Execute the below command manually:\n\n'
             'CertUtil -revoke ' +
-        cert.data.serialNumber.toString();
+        cert.data.serialNumber.toRadixString(16);
   }
 }
 
diff --git a/pubspec.yaml b/pubspec.yaml
index 979fc24..e8990ec 100644
--- a/pubspec.yaml
+++ b/pubspec.yaml
@@ -11,7 +11,7 @@ description: A new Flutter project.
 # In iOS, build-name is used as CFBundleShortVersionString while build-number used as CFBundleVersion.
 # Read more about iOS versioning at
 # https://developer.apple.com/library/archive/documentation/General/Reference/InfoPlistKeyReference/Articles/CoreFoundationKeys.html
-version: 1.2.0+3
+version: 1.3.0+4
 
 environment:
   sdk: ">=2.2.0 <3.0.0"