diff --git a/src/BootstrapBlazor.Server/Components/Components/Pre.razor.js b/src/BootstrapBlazor.Server/Components/Components/Pre.razor.js
index 71bb71ce3b8..8e4e4323e77 100644
--- a/src/BootstrapBlazor.Server/Components/Components/Pre.razor.js
+++ b/src/BootstrapBlazor.Server/Components/Components/Pre.razor.js
@@ -55,7 +55,7 @@ export async function highlight(id) {
 
     if (el) {
         const invoke = () => {
-            hljs.highlightElement(el.querySelector('code'))
+            hljs.highlightElement(el.querySelector('code'));
             el.querySelector('.loading').classList.add('d-none')
             el.classList.remove('loaded')
         }
@@ -64,6 +64,9 @@ export async function highlight(id) {
             const handler = setInterval(() => {
                 const done = window.hljs !== void 0;
                 if (done) {
+                    hljs.configure({
+                        ignoreUnescapedHTML: true
+                    });
                     clearInterval(handler)
                     resolve()
                 }
diff --git a/src/BootstrapBlazor/Services/Serial/DefaultSerialService.cs b/src/BootstrapBlazor/Services/Serial/DefaultSerialService.cs
index 0037cbd821e..09b6880ceca 100644
--- a/src/BootstrapBlazor/Services/Serial/DefaultSerialService.cs
+++ b/src/BootstrapBlazor/Services/Serial/DefaultSerialService.cs
@@ -27,8 +27,7 @@ public DefaultSerialService(IJSRuntime jsRuntime)
 
     private async Task<JSModule> LoadModule()
     {
-        var module = await _runtime.LoadModule("./_content/BootstrapBlazor/modules/serial.js")
-            ?? throw new InvalidOperationException("Load serial module failed");
+        var module = await _runtime.LoadModule("./_content/BootstrapBlazor/modules/serial.js");
 
         IsSupport = await module.InvokeAsync<bool>("init", _serialPortId);
         return module;
diff --git a/test/UnitTest/Services/SerialServiceTest.cs b/test/UnitTest/Services/SerialServiceTest.cs
index 625f8ed5c9c..bb936eb1efd 100644
--- a/test/UnitTest/Services/SerialServiceTest.cs
+++ b/test/UnitTest/Services/SerialServiceTest.cs
@@ -9,6 +9,7 @@ public class SerialServiceTest : BootstrapBlazorTestBase
     [Fact]
     public async Task GetPort_Ok()
     {
+        // https://itldg.github.io/web-serial-debug/?wt.mc_id=DT-MVP-5004174 网页串口调试工具
         Context.JSInterop.Setup<bool>("init", matcher => matcher.Arguments.Count == 1 && (matcher.Arguments[0]?.ToString()?.StartsWith("bb_serial_") ?? false)).SetResult(true);
         Context.JSInterop.Setup<bool>("getPort", matcher => matcher.Arguments.Count == 1 && (matcher.Arguments[0]?.ToString()?.StartsWith("bb_serial_") ?? false)).SetResult(true);
         Context.JSInterop.Setup<bool>("open", matcher => matcher.Arguments.Count == 4 && (matcher.Arguments[0]?.ToString()?.StartsWith("bb_serial_") ?? false)).SetResult(true);