diff --git a/client/public/changelog.md b/client/public/changelog.md
index e8dccd7..cff6f4f 100644
--- a/client/public/changelog.md
+++ b/client/public/changelog.md
@@ -2,6 +2,11 @@
 
 > This document records feature updates and bug fixes for the Luxsin X9 controller. Entries are listed in reverse chronological order — the newest release appears first.
 
+## v2026.09.01
+
+### Bug Fixes
+- Fixed the incorrect firmware version display on the System page.
+
 ## v2026.08.17
 
 ### Changes
diff --git a/client/src/lib/luxsinApi.ts b/client/src/lib/luxsinApi.ts
index 7ae4ad5..6fe3429 100644
--- a/client/src/lib/luxsinApi.ts
+++ b/client/src/lib/luxsinApi.ts
@@ -477,7 +477,11 @@ export function parseFirmwareVersion(version: unknown): number {
   return Number(parts[parts.length - 1]);
 }
 
-/** Display firmware version as X.Y.0.Z (e.g. 2005 → 2.0.0.5). */
+/**
+ * Display firmware version.
+ * n < 2010: X.Y.0.Z (e.g. 2005 → 2.0.0.5).
+ * n >= 2010: third segment carries the two-digit tail (e.g. 2010 → 2.0.10.0, 2011 → 2.0.11.0).
+ */
 export function formatFirmwareVersionDisplay(version: unknown): string {
   if (version === null || version === undefined || String(version).trim() === "") {
     return "—";
@@ -485,6 +489,10 @@ export function formatFirmwareVersionDisplay(version: unknown): string {
   const n = parseFirmwareVersion(version);
   const major = Math.floor(n / 1000);
   const minor = Math.floor((n % 1000) / 100);
+  if (n >= 2010) {
+    // Since 2.0.10.0 the third segment counts up (09 → 10), fourth segment stays 0.
+    return `${major}.${minor}.${n % 100}.0`;
+  }
   const patch = 0;
   const build = n % 10;
   return `${major}.${minor}.${patch}.${build}`;