diff --git a/client/i.html b/client/i.html
index 786a0bc..5b0ca7a 100644
--- a/client/i.html
+++ b/client/i.html
@@ -3,7 +3,7 @@
 <head>
   <meta charset="UTF-8" />
   <meta name="viewport" content="width=device-width, initial-scale=1.0, maximum-scale=1" />
-  <title>Luxsin X9 Controller</title>
+  <title>Luxsin B9 Controller</title>
   <style>
     body { margin:0; display:flex; align-items:center; justify-content:center; min-height:100vh; background:#000; color:rgba(255,255,255,.5); font-family:-apple-system,sans-serif; }
     .spinner { width:24px; height:24px; border:3px solid rgba(255,255,255,.15); border-top-color:#00FFF6; border-radius:50%; animation:spin .8s linear infinite; margin-right:12px; }
diff --git a/client/i.legacy.html b/client/i.legacy.html
index e00ea6e..44572f9 100644
--- a/client/i.legacy.html
+++ b/client/i.legacy.html
@@ -3,7 +3,7 @@
   <head>
     <meta charset="UTF-8" />
     <meta name="viewport" content="width=device-width, initial-scale=1.0, maximum-scale=1" />
-    <title>Luxsin X9 Controller (Legacy)</title>
+    <title>Luxsin B9 Controller (Legacy)</title>
   </head>
   <body>
     <div id="root"></div>
diff --git a/client/i.modern.html b/client/i.modern.html
index ede4cfc..bd988ce 100644
--- a/client/i.modern.html
+++ b/client/i.modern.html
@@ -3,7 +3,7 @@
   <head>
     <meta charset="UTF-8" />
     <meta name="viewport" content="width=device-width, initial-scale=1.0, maximum-scale=1" />
-    <title>Luxsin X9 Controller</title>
+    <title>Luxsin B9 Controller</title>
   </head>
   <body>
     <div id="root"></div>
diff --git a/client/public/images/vu/vu11.png b/client/public/images/vu/vu11.png
index b589d71..c0276a2 100644
Binary files a/client/public/images/vu/vu11.png and b/client/public/images/vu/vu11.png differ
diff --git a/client/public/images/vu/vu12.png b/client/public/images/vu/vu12.png
index cc27ab8..8bdd881 100644
Binary files a/client/public/images/vu/vu12.png and b/client/public/images/vu/vu12.png differ
diff --git a/client/public/images/vu/vu13.png b/client/public/images/vu/vu13.png
index 8492d89..4179f7a 100644
Binary files a/client/public/images/vu/vu13.png and b/client/public/images/vu/vu13.png differ
diff --git a/client/public/images/vu/vu14.png b/client/public/images/vu/vu14.png
index 2ea57af..00ee2f4 100644
Binary files a/client/public/images/vu/vu14.png and b/client/public/images/vu/vu14.png differ
diff --git a/client/public/images/vu/vu15.png b/client/public/images/vu/vu15.png
index 95ce949..15f4999 100644
Binary files a/client/public/images/vu/vu15.png and b/client/public/images/vu/vu15.png differ
diff --git a/client/public/images/vu/vu16.png b/client/public/images/vu/vu16.png
index 335b829..95ce949 100644
Binary files a/client/public/images/vu/vu16.png and b/client/public/images/vu/vu16.png differ
diff --git a/client/public/images/vu/vu17.png b/client/public/images/vu/vu17.png
new file mode 100644
index 0000000..335b829
Binary files /dev/null and b/client/public/images/vu/vu17.png differ
diff --git a/client/public/images/vu/vu5.png b/client/public/images/vu/vu5.png
index c0276a2..b589d71 100644
Binary files a/client/public/images/vu/vu5.png and b/client/public/images/vu/vu5.png differ
diff --git a/client/public/images/vu/vu6.png b/client/public/images/vu/vu6.png
index 8bdd881..cc27ab8 100644
Binary files a/client/public/images/vu/vu6.png and b/client/public/images/vu/vu6.png differ
diff --git a/client/public/images/vu/vu7.png b/client/public/images/vu/vu7.png
index 4179f7a..8492d89 100644
Binary files a/client/public/images/vu/vu7.png and b/client/public/images/vu/vu7.png differ
diff --git a/client/public/images/vu/vu8.png b/client/public/images/vu/vu8.png
index 00ee2f4..2ea57af 100644
Binary files a/client/public/images/vu/vu8.png and b/client/public/images/vu/vu8.png differ
diff --git a/client/src/App.tsx b/client/src/App.tsx
index 33e4af8..ac02904 100644
--- a/client/src/App.tsx
+++ b/client/src/App.tsx
@@ -11,7 +11,6 @@ import Home from "./pages/Home";
 import NotFound from "./pages/NotFound";
 import Dashboard from "./pages/Dashboard";
 import AudioPage from "./pages/AudioPage";
-import BluetoothPage from "./pages/BluetoothPage";
 import SystemPage from "./pages/SystemPage";
 import IOPage from "./pages/IOPage";
 import VUPage from "./pages/VUPage";
@@ -61,7 +60,6 @@ function AppRouter() {
       <Route path="/audio" component={AudioPage} />
       <Route path="/eq" component={EQPageRoute} />
       <Route path="/effects" component={EffectsPageRoute} />
-      <Route path="/bluetooth" component={BluetoothPage} />
       <Route path="/system" component={SystemPage} />
       <Route path="/io" component={IOPage} />
       <Route path="/vu" component={VUPage} />
diff --git a/client/src/components/Sidebar.tsx b/client/src/components/Sidebar.tsx
index c16fa3e..b3b28f9 100644
--- a/client/src/components/Sidebar.tsx
+++ b/client/src/components/Sidebar.tsx
@@ -5,7 +5,6 @@
 import { useDevice } from "@/contexts/DeviceContext";
 import { cn } from "@/lib/utils";
 import {
-  Bluetooth,
   ChevronRight,
   Gauge,
   Layers,
@@ -27,7 +26,6 @@ const NAV_ITEMS: NavItem[] = [
   { path: "/audio", icon: Volume2, label: "Audio" },
   { path: "/eq", icon: Sliders, label: "Parametric EQ" },
   { path: "/effects", icon: Layers, label: "Effects" },
-  { path: "/bluetooth", icon: Bluetooth, label: "Bluetooth" },
   { path: "/system", icon: Settings, label: "System" },
 ];
 
diff --git a/client/src/lib/luxsinApi.ts b/client/src/lib/luxsinApi.ts
index 7ae4ad5..74e9b83 100644
--- a/client/src/lib/luxsinApi.ts
+++ b/client/src/lib/luxsinApi.ts
@@ -257,7 +257,7 @@ export interface PeqSoftPayload {
 // ============================================================
 // Input/Output Labels
 // ============================================================
-export const INPUT_LABELS = ["USB", "USB-C", "Coaxial", "Optical", "Bluetooth", "HDMI-EARC", "RCA"];
+export const INPUT_LABELS = ["USB", "USB-C", "Coaxial", "Optical", "Bluetooth", "IIS", "RCA"];
 export const OUTPUT_LABELS = ["XLR", "RCA", "Headset", "XLR/RCA"];
 
 /** Device `input` index for Bluetooth source. */
diff --git a/client/src/locales/data-de.json b/client/src/locales/data-de.json
index 06ee382..1b49062 100644
--- a/client/src/locales/data-de.json
+++ b/client/src/locales/data-de.json
@@ -55,7 +55,7 @@
     "pageTitle": "I/O",
     "inputSection": "Eingang",
     "outputSection": "Ausgang",
-    "inputOptions": ["USB-B", "USB-C", "Koaxial", "Optisch", "Bluetooth", "HDMI-EARC", "RCA", "USB Driver"],
+    "inputOptions": ["USB-B", "USB-C", "Koaxial", "Optisch", "Bluetooth", "IIS", "RCA", "USB Driver"],
     "outputOptions": ["XLR", "RCA", "XLR/RCA", "Kopfhörer"],
     "input": {
       "coaxial": "KOAXIAL",
diff --git a/client/src/locales/data-en.json b/client/src/locales/data-en.json
index 8dacc45..7dc6acf 100644
--- a/client/src/locales/data-en.json
+++ b/client/src/locales/data-en.json
@@ -55,7 +55,7 @@
     "pageTitle": "I/O",
     "inputSection": "Input",
     "outputSection": "Output",
-    "inputOptions": ["USB-B", "USB-C", "Coaxial", "Optical", "Bluetooth", "HDMI-EARC", "RCA", "USB Driver"],
+    "inputOptions": ["USB-B", "USB-C", "Coaxial", "Optical", "Bluetooth", "IIS", "RCA", "USB Driver"],
     "outputOptions": ["XLR", "RCA", "XLR/RCA", "Headset"],
     "input": {
       "coaxial": "COAXIAL",
diff --git a/client/src/locales/data-es.json b/client/src/locales/data-es.json
index d66072a..b56a111 100644
--- a/client/src/locales/data-es.json
+++ b/client/src/locales/data-es.json
@@ -55,7 +55,7 @@
     "pageTitle": "E/S",
     "inputSection": "Entrada",
     "outputSection": "Salida",
-    "inputOptions": ["USB-B", "USB-C", "Coaxial", "Óptico", "Bluetooth", "HDMI-EARC", "RCA", "USB Driver"],
+    "inputOptions": ["USB-B", "USB-C", "Coaxial", "Óptico", "Bluetooth", "IIS", "RCA", "USB Driver"],
     "outputOptions": ["XLR", "RCA", "XLR/RCA", "Auriculares"],
     "input": {
       "coaxial": "COAXIAL",
diff --git a/client/src/locales/data-fr.json b/client/src/locales/data-fr.json
index 512a0df..c057999 100644
--- a/client/src/locales/data-fr.json
+++ b/client/src/locales/data-fr.json
@@ -55,7 +55,7 @@
     "pageTitle": "E/S",
     "inputSection": "Entrée",
     "outputSection": "Sortie",
-    "inputOptions": ["USB-B", "USB-C", "Coaxial", "Optique", "Bluetooth", "HDMI-EARC", "RCA", "USB Driver"],
+    "inputOptions": ["USB-B", "USB-C", "Coaxial", "Optique", "Bluetooth", "IIS", "RCA", "USB Driver"],
     "outputOptions": ["XLR", "RCA", "XLR/RCA", "Casque"],
     "input": {
       "coaxial": "COAXIAL",
diff --git a/client/src/locales/data-zh-HK.json b/client/src/locales/data-zh-HK.json
index eec8edc..b483b61 100644
--- a/client/src/locales/data-zh-HK.json
+++ b/client/src/locales/data-zh-HK.json
@@ -55,7 +55,7 @@
     "pageTitle": "輸入/輸出",
     "inputSection": "輸入",
     "outputSection": "輸出",
-    "inputOptions": ["USB-B", "USB-C", "同軸", "光纖", "藍牙", "HDMI-EARC", "類比RCA", "USB隨身碟"],
+    "inputOptions": ["USB-B", "USB-C", "同軸", "光纖", "藍牙", "IIS", "類比RCA", "USB隨身碟"],
     "outputOptions": ["XLR", "RCA", "XLR/RCA", "耳機"],
     "input": { "coaxial": "同軸", "optical": "光纖", "bluetooth": "藍牙", "rca": "類比RCA" },
     "output": { "headset": "耳機" }
diff --git a/client/src/locales/data-zh.json b/client/src/locales/data-zh.json
index e1e81b7..db89bf6 100644
--- a/client/src/locales/data-zh.json
+++ b/client/src/locales/data-zh.json
@@ -55,7 +55,7 @@
     "pageTitle": "输入输出",
     "inputSection": "输入",
     "outputSection": "输出",
-    "inputOptions": ["USB-B", "USB-C", "同轴", "光纤", "蓝牙", "HDMI-EARC", "模拟RCA", "U盘"],
+    "inputOptions": ["USB-B", "USB-C", "同轴", "光纤", "蓝牙", "IIS", "模拟RCA", "U盘"],
     "outputOptions": ["XLR", "RCA", "XLR/RCA", "耳机"],
     "input": { "coaxial": "同轴", "optical": "光纤", "bluetooth": "蓝牙", "rca": "模拟RCA" },
     "output": { "headset": "耳机" }
diff --git a/client/src/pages/AudioPage.tsx b/client/src/pages/AudioPage.tsx
index e46941f..1662fad 100644
--- a/client/src/pages/AudioPage.tsx
+++ b/client/src/pages/AudioPage.tsx
@@ -4,6 +4,7 @@
    Sections:
      - 平衡与灵敏度: 左右平衡, VU灵敏度, 模拟输入增益 sliders
      - 输出特性: 滤波特性, 耳机增益, 音量幅度
+     - IIS设置: IIS静音电平, IIS模式
      - 系统与接口: 开机音量, XLR极性
    All list rows → navigate to /select page
    ============================================================ */
@@ -107,6 +108,7 @@ type LocaleDac = {
   dac?: {
     sectionBalanceSensitivity?: string;
     sectionOutput?: string;
+    sectionIisSettings?: string;
     sectionSystemInterface?: string;
     balance?: string;
     sensitivity?: string;
@@ -119,6 +121,8 @@ type LocaleDac = {
     volumeStep?: string;
     bootVolume?: string | { label?: string; options?: Array<{ index: number; label: string }> };
     xlr?: { label?: string; options?: Array<{ index: number; label: string }> };
+    mutePolar?: { label?: string; options?: Array<{ index: number; label: string }> };
+    IISMode?: { label?: string; options?: Array<{ index: number; label: string }> };
   };
   home?: { audioSet?: string };
 };
@@ -222,6 +226,8 @@ export default function AudioPage() {
   const stepIdx = ds?.soundStep ?? 1;
   const filterIdx = ds?.pcm ?? 0;
   const xlrIdx = ds?.xlr ?? 0;
+  const mutePolarIdx = (ds as ({ hdmimutepolar?: number } | null))?.hdmimutepolar ?? 0;
+  const iisModeIdx = (ds as ({ hdmiType?: number } | null))?.hdmiType ?? 0;
   const bootSoundVal = normalizeBootSound(localBootSound);
   const firmwareVersion = parseFirmwareVersion(ds?.version);
   const bootSoundMaxIdx = getBootSoundMaxIndex(firmwareVersion);
@@ -233,6 +239,8 @@ export default function AudioPage() {
   const DAC_VOLUME_DIRECT_OPTIONS = optionLabels(dacText.dacVolumeDirect?.options, ["关闭", "0dB", "-12dB"]);
   const DAC_ARC_OPTIONS = optionLabels(dacText.dacArc?.options, ["ARC", "EARC"]);
   const XLR_OPTIONS = optionLabels(dacText.xlr?.options, ["正常", "反转"]);
+  const MUTE_POLAR_OPTIONS = optionLabels(dacText.mutePolar?.options, ["低电平", "高电平"]);
+  const IIS_MODE_OPTIONS = optionLabels(dacText.IISMode?.options, ["模式1", "模式2", "模式3", "模式4", "模式5", "模式6", "模式7", "模式8"]);
 
   const pageTitle = usePageTitleWithConnection(localeData.home?.audioSet ?? "Audio");
 
@@ -380,6 +388,21 @@ export default function AudioPage() {
           />
         </div>
 
+        {/* ── IIS 设置 ── */}
+        <SectionHeader title={dacText.sectionIisSettings ?? "IIS设置"} />
+        <div className="ios-list-group">
+          <ListRow
+            label={dacText.mutePolar?.label ?? "IIS 静音电平"}
+            value={MUTE_POLAR_OPTIONS[mutePolarIdx] ?? MUTE_POLAR_OPTIONS[0] ?? "—"}
+            onClick={() => goSelect(dacText.mutePolar?.label ?? "选择 IIS 静音电平", MUTE_POLAR_OPTIONS, mutePolarIdx, "mutePolar")}
+          />
+          <ListRow
+            label={dacText.IISMode?.label ?? "IIS 模式"}
+            value={IIS_MODE_OPTIONS[iisModeIdx] ?? IIS_MODE_OPTIONS[0] ?? "—"}
+            onClick={() => goSelect(dacText.IISMode?.label ?? "选择 IIS 模式", IIS_MODE_OPTIONS, iisModeIdx, "IISMode")}
+          />
+        </div>
+
         {/* ── 系统与接口 ── */}
         <SectionHeader title={dacText.sectionSystemInterface ?? "系统与接口"} />
         <div className="ios-list-group">
diff --git a/client/src/pages/BluetoothPage.tsx b/client/src/pages/BluetoothPage.tsx
deleted file mode 100644
index 214002e..0000000
--- a/client/src/pages/BluetoothPage.tsx
+++ /dev/null
@@ -1,148 +0,0 @@
-/* ============================================================
-   BLUETOOTH PAGE — BT status, transport controls
-   ============================================================ */
-import Layout from "@/components/Layout";
-import { useDevice } from "@/contexts/DeviceContext";
-import { cn } from "@/lib/utils";
-import { BT_STATUS_LABELS } from "@/lib/luxsinApi";
-import { Bluetooth, Music, SkipBack, SkipForward, Volume2 } from "lucide-react";
-
-export default function BluetoothPage() {
-  const { deviceState, updateSetting } = useDevice();
-
-  if (!deviceState) {
-    return (
-      <Layout title="Bluetooth" subtitle="Bluetooth audio source">
-        <div className="glass-card p-8 text-center text-white/30">Connect to device</div>
-      </Layout>
-    );
-  }
-
-  const { bt_status, bt_title, bt_artist, bt_srcname } = deviceState;
-  const isPlaying = bt_status === 1;
-  const isConnected = bt_status > 0;
-
-  return (
-    <Layout title="Bluetooth" subtitle="Bluetooth audio source">
-      <div className="max-w-2xl mx-auto space-y-4">
-
-        {/* Status card */}
-        <div className={cn(
-          "glass-card p-6 animate-fade-in-up transition-all duration-300",
-          isConnected && "glass-cyan"
-        )}>
-          <div className="flex items-center gap-4 mb-6">
-            <div className={cn(
-              "w-14 h-14 rounded-2xl flex items-center justify-center",
-              isConnected ? "glass-cyan" : "bg-white/5"
-            )}>
-              <Bluetooth size={24} className={isConnected ? "text-[#00FFF6]" : "text-white/30"} />
-            </div>
-            <div>
-              <h2 className={cn(
-                "text-lg font-bold",
-                isConnected ? "text-[#00FFF6]" : "text-white/50"
-              )} style={{ fontFamily: "'Space Grotesk', sans-serif" }}>
-                {isConnected ? bt_srcname || "Connected" : "Not Connected"}
-              </h2>
-              <p className="text-white/40 text-sm">{BT_STATUS_LABELS[bt_status]}</p>
-            </div>
-            {isConnected && <div className="ml-auto dot-active" />}
-          </div>
-
-          {isConnected ? (
-            <>
-              {/* Track info */}
-              <div className="glass-card p-4 mb-5 rounded-[16px]">
-                <div className="flex items-center gap-3">
-                  <div className="w-10 h-10 rounded-[10px] bg-white/5 flex items-center justify-center flex-shrink-0">
-                    <Music size={16} className="text-white/30" />
-                  </div>
-                  <div className="flex-1 min-w-0">
-                    <p className="text-white font-semibold text-sm truncate"
-                      style={{ fontFamily: "'Space Grotesk', sans-serif" }}>
-                      {bt_title || "Unknown Track"}
-                    </p>
-                    <p className="text-white/50 text-xs truncate mt-0.5">
-                      {bt_artist || "Unknown Artist"}
-                    </p>
-                  </div>
-                  {isPlaying && (
-                    <div className="flex items-end gap-0.5 h-5 flex-shrink-0">
-                      {[1, 2, 3, 4].map(i => (
-                        <div
-                          key={i}
-                          className="w-1 rounded-sm bg-[#00FFF6]"
-                          style={{
-                            height: `${30 + Math.random() * 70}%`,
-                            animation: `vu-pulse ${0.3 + i * 0.1}s ease-in-out infinite alternate`,
-                          }}
-                        />
-                      ))}
-                    </div>
-                  )}
-                </div>
-              </div>
-
-              {/* Transport controls */}
-              <div className="flex items-center justify-center gap-6">
-                <button
-                  onClick={() => updateSetting({ bt_next: 0 })}
-                  className="btn-glass w-12 h-12 flex items-center justify-center"
-                >
-                  <SkipBack size={18} className="text-white/60" />
-                </button>
-
-                <button
-                  onClick={() => updateSetting({ bt_play: 1 })}
-                  className={cn(
-                    "w-16 h-16 rounded-full flex items-center justify-center transition-all duration-200",
-                    isPlaying ? "btn-cyan" : "btn-glass"
-                  )}
-                  style={isPlaying ? {
-                    boxShadow: "0 0 30px rgba(0,255,246,0.4)"
-                  } : {}}
-                >
-                  {isPlaying ? (
-                    <div className="flex gap-1">
-                      <div className="w-1.5 h-5 bg-current rounded-sm" />
-                      <div className="w-1.5 h-5 bg-current rounded-sm" />
-                    </div>
-                  ) : (
-                    <div className="w-0 h-0 border-l-[14px] border-l-current border-y-[9px] border-y-transparent ml-1" />
-                  )}
-                </button>
-
-                <button
-                  onClick={() => updateSetting({ bt_next: 1 })}
-                  className="btn-glass w-12 h-12 flex items-center justify-center"
-                >
-                  <SkipForward size={18} className="text-white/60" />
-                </button>
-              </div>
-            </>
-          ) : (
-            <div className="flex flex-col items-center py-8 text-white/30">
-              <Bluetooth size={40} className="mb-3 opacity-20" />
-              <p className="text-sm">No Bluetooth device connected</p>
-              <p className="text-xs mt-1 opacity-60">Switch input to Bluetooth to use this feature</p>
-            </div>
-          )}
-        </div>
-
-        {/* Volume info */}
-        {isConnected && (
-          <div className="glass-card p-4 flex items-center gap-3 animate-fade-in-up" style={{ animationDelay: "60ms" }}>
-            <Volume2 size={14} className="text-[#00FFF6]" />
-            <span className="text-white/60 text-sm flex-1">Current Volume</span>
-            <span className="text-[#00FFF6] font-bold text-lg"
-              style={{ fontFamily: "'JetBrains Mono', monospace" }}>
-              {deviceState.volume}
-            </span>
-            <span className="text-white/30 text-xs">/ 200</span>
-          </div>
-        )}
-      </div>
-    </Layout>
-  );
-}
diff --git a/client/src/pages/Home.tsx b/client/src/pages/Home.tsx
index f7cc51e..6d30be2 100644
--- a/client/src/pages/Home.tsx
+++ b/client/src/pages/Home.tsx
@@ -36,7 +36,6 @@ import {
   Sliders,
   Activity,
   Gauge,
-  Undo2,
   Bluetooth,
   SkipBack,
   SkipForward,
@@ -635,7 +634,7 @@ export default function Home() {
             </div>
             {/* Brand label */}
             <div className="absolute top-5 left-8">
-              <span className="text-[11px] font-bold tracking-widest text-white/30">LUXSIN</span>
+              <span className="text-[11px] font-bold tracking-widest text-white/30">{deviceState?.device ?? "LUXSIN"}</span>
             </div>
           </div>
         </div>
@@ -965,15 +964,6 @@ export default function Home() {
             thumbnail={`${import.meta.env.BASE_URL}images/vu/vu${(ds.vu ?? 0) + 1}.png`}
             onClick={() => setLocation("/vu")}
           />
-          <ListRow
-            icon={<Undo2 size={18} />}
-            label={homeText.backToLegacy ?? "返回旧版"}
-            onClick={() => {
-              const target = ip.trim();
-              if (!target) return;
-              window.location.href = `https://am.luxsinaudio.com/i.html?ip=${encodeURIComponent(target)}`;
-            }}
-          />
         </div>
       </div>
 
diff --git a/client/src/pages/IOPage.tsx b/client/src/pages/IOPage.tsx
index 1ff5ae6..360c756 100644
--- a/client/src/pages/IOPage.tsx
+++ b/client/src/pages/IOPage.tsx
@@ -164,7 +164,7 @@ const OUTPUT_OPTION_DEFS: IOOptionDef[] = [
   },
 ];
 
-const FALLBACK_INPUT_LABELS = ["USB-B", "USB-C", "同轴", "光纤", "蓝牙", "HDMI-EARC", "RCA", "USB Driver"];
+const FALLBACK_INPUT_LABELS = ["USB-B", "USB-C", "同轴", "光纤", "蓝牙", "IIS", "RCA", "USB Driver"];
 const FALLBACK_OUTPUT_LABELS = ["XLR", "RCA", "XLR/RCA", "耳机"];
 
 function withLabels(defs: IOOptionDef[], labels: string[] | undefined, fallback: string[]): IOOption[] {
