diff --git a/Taskfile.yml b/Taskfile.yml
index e075d5a..7b8dbfa 100644
--- a/Taskfile.yml
+++ b/Taskfile.yml
@@ -289,27 +289,51 @@ tasks:
             - task: build-appimage
 
     electron-legacy:
-        desc: Install legacy Electron version
+        desc: Ensure legacy Electron version is available (will be downloaded by electron-builder if needed)
         cmds:
-            - "{{.NPM}} install --no-save electron@{{.LEGACY_ELECTRON_VERSION}}"
+            - 'echo "Building with legacy Electron version: {{.LEGACY_ELECTRON_VERSION}}"'
 
     build-appimage-legacy:
         desc: Build Linux AppImage with legacy Electron version
         deps: [build-frontend, electron-legacy]
         cmds:
-            - "{{.NPM}} run electron-postinstall"
+            - "npx electron-builder install-app-deps --config package-legacy.json"
             - "PLATFORM=linux {{.NPM}} run build-backend"
-            - "{{.NPM}} run dist -- --linux AppImage -c.extraMetadata.main=electron/main-legacy.js"
-            - "./scripts/rename_legacy_artifacts.sh"
+            - "npx electron-builder --config package-legacy.json --linux AppImage --publish=never"
 
     build-exe-legacy:
         desc: Build Windows portable executable with legacy Electron version
         deps: [build-frontend, electron-legacy]
         cmds:
-            - "{{.NPM}} run electron-postinstall"
+            - "npx electron-builder install-app-deps --config package-legacy.json"
             - "PLATFORM=win32 {{.NPM}} run build-backend"
-            - "{{.NPM}} run dist -- --win portable -c.extraMetadata.main=electron/main-legacy.js"
-            - "./scripts/rename_legacy_artifacts.sh"
+            - "npx electron-builder --config package-legacy.json --win portable --publish=never"
+
+    build-exe-legacy-wine:
+        desc: Build Windows portable executable and NSIS installer using Wine (Legacy)
+        deps: [build-frontend, electron-legacy]
+        cmds:
+            - "npx electron-builder install-app-deps --config package-legacy.json"
+            - "PLATFORM=win32 PYTHON_CMD='{{.WINE_PYTHON}}' {{.NPM}} run build-backend"
+            - "npx electron-builder --config package-legacy.json --win portable nsis --publish=never"
+
+    build-legacy-all:
+        desc: Build all legacy Electron apps (Linux and Windows)
+        deps: [build-frontend, electron-legacy]
+        cmds:
+            - "npx electron-builder install-app-deps --config package-legacy.json"
+            - "PLATFORM=linux {{.NPM}} run build-backend"
+            - "PLATFORM=win32 {{.NPM}} run build-backend"
+            - "npx electron-builder --config package-legacy.json --linux AppImage deb --win portable nsis --publish=never"
+
+    build-legacy-all-wine:
+        desc: Build all legacy Electron apps (Linux + Windows via Wine)
+        deps: [build-frontend, electron-legacy]
+        cmds:
+            - "npx electron-builder install-app-deps --config package-legacy.json"
+            - "PLATFORM=linux {{.NPM}} run build-backend"
+            - "PLATFORM=win32 PYTHON_CMD='{{.WINE_PYTHON}}' {{.NPM}} run build-backend"
+            - "npx electron-builder --config package-legacy.json --linux AppImage deb --win portable nsis --publish=never"
 
     forge-start:
         desc: Run the application with Electron Forge
diff --git a/electron/main-legacy.js b/electron/main-legacy.js
index 9679e03..f6e9528 100644
--- a/electron/main-legacy.js
+++ b/electron/main-legacy.js
@@ -1,15 +1,76 @@
-const { app, BrowserWindow, dialog, ipcMain, shell, systemPreferences } = require("electron");
+const {
+    app,
+    BrowserWindow,
+    dialog,
+    ipcMain,
+    shell,
+    systemPreferences,
+    Notification,
+    powerSaveBlocker,
+} = require("electron");
 const electronPrompt = require("electron-prompt");
 const { spawn } = require("child_process");
 const fs = require("fs");
 const path = require("node:path");
+const crypto = require("crypto");
 
 // remember main window
 var mainWindow = null;
 
+// power save blocker id
+var activePowerSaveBlockerId = null;
+
 // remember child process for exe so we can kill it when app exits
 var exeChildProcess = null;
 
+// store integrity status
+var integrityStatus = {
+    backend: { ok: true, issues: [] },
+    data: { ok: true, issues: [] },
+};
+
+function verifyBackendIntegrity(exeDir) {
+    const manifestPath = path.join(exeDir, "backend-manifest.json");
+    if (!fs.existsSync(manifestPath)) {
+        log("Backend integrity manifest missing, skipping check.");
+        return { ok: true, issues: ["Manifest missing"] };
+    }
+
+    try {
+        const manifest = JSON.parse(fs.readFileSync(manifestPath, "utf8"));
+        const issues = [];
+
+        const filesToVerify = manifest.files || manifest;
+        const metadata = manifest._metadata || {};
+
+        for (const [relPath, expectedHash] of Object.entries(filesToVerify)) {
+            const fullPath = path.join(exeDir, relPath);
+            if (!fs.existsSync(fullPath)) {
+                issues.push(`Missing: ${relPath}`);
+                continue;
+            }
+
+            const fileBuffer = fs.readFileSync(fullPath);
+            const actualHash = crypto.createHash("sha256").update(fileBuffer).digest("hex");
+            if (actualHash !== expectedHash) {
+                issues.push(`Modified: ${relPath}`);
+            }
+        }
+
+        if (issues.length > 0 && metadata.date && metadata.time) {
+            issues.unshift(`Backend build timestamp: ${metadata.date} ${metadata.time}`);
+        }
+
+        return {
+            ok: issues.length === 0,
+            issues: issues,
+        };
+    } catch (error) {
+        log(`Backend integrity check failed: ${error.message}`);
+        return { ok: false, issues: [error.message] };
+    }
+}
+
 // allow fetching app version via ipc
 ipcMain.handle("app-version", () => {
     return app.getVersion();
@@ -24,12 +85,43 @@ ipcMain.handle("is-hardware-acceleration-enabled", () => {
     return true; // Assume true for older versions
 });
 
-// allow fetching integrity status (Stub for legacy)
+// allow fetching integrity status
 ipcMain.handle("get-integrity-status", () => {
-    return {
-        backend: { ok: true, issues: ["Not supported in legacy mode"] },
-        data: { ok: true, issues: ["Not supported in legacy mode"] },
-    };
+    return integrityStatus;
+});
+
+// Native Notification IPC
+ipcMain.handle("show-notification", (event, { title, body, silent }) => {
+    const notification = new Notification({
+        title: title,
+        body: body,
+        silent: silent,
+    });
+    notification.show();
+
+    notification.on("click", () => {
+        if (mainWindow) {
+            mainWindow.show();
+            mainWindow.focus();
+        }
+    });
+});
+
+// Power Management IPC
+ipcMain.handle("set-power-save-blocker", (event, enabled) => {
+    if (enabled) {
+        if (activePowerSaveBlockerId === null) {
+            activePowerSaveBlockerId = powerSaveBlocker.start("prevent-app-suspension");
+            log("Power save blocker started.");
+        }
+    } else {
+        if (activePowerSaveBlockerId !== null) {
+            powerSaveBlocker.stop(activePowerSaveBlockerId);
+            activePowerSaveBlockerId = null;
+            log("Power save blocker stopped.");
+        }
+    }
+    return activePowerSaveBlockerId !== null;
 });
 
 // ignore ssl errors
@@ -80,6 +172,19 @@ ipcMain.handle("relaunch", () => {
     app.exit();
 });
 
+ipcMain.handle("relaunch-emergency", () => {
+    app.relaunch({ args: process.argv.slice(1).concat(["--emergency"]) });
+    app.exit();
+});
+
+ipcMain.handle("shutdown", () => {
+    quit();
+});
+
+ipcMain.handle("get-memory-usage", async () => {
+    return process.getProcessMemoryInfo();
+});
+
 // allow showing a file path in os file manager
 ipcMain.handle("showPathInFolder", (event, path) => {
     shell.showItemInFolder(path);
@@ -245,6 +350,13 @@ app.whenReady().then(async () => {
 
     log(`Found executable at: ${exe}`);
 
+    // Verify backend integrity before spawning
+    const exeDir = path.dirname(exe);
+    integrityStatus.backend = verifyBackendIntegrity(exeDir);
+    if (!integrityStatus.backend.ok) {
+        log(`INTEGRITY WARNING: Backend tampering detected! Issues: ${integrityStatus.backend.issues.join(", ")}`);
+    }
+
     try {
         // arguments we always want to pass in
         const requiredArguments = [
diff --git a/package-legacy.json b/package-legacy.json
new file mode 100644
index 0000000..e2237b4
--- /dev/null
+++ b/package-legacy.json
@@ -0,0 +1,60 @@
+{
+    "appId": "com.sudoivan.reticulummeshchat-legacy",
+    "productName": "Reticulum MeshChatX Legacy",
+    "electronVersion": "30.0.8",
+    "extraMetadata": {
+        "main": "electron/main-legacy.js"
+    },
+    "asar": true,
+    "electronFuses": {
+        "runAsNode": false,
+        "enableCookieEncryption": true,
+        "enableNodeOptionsEnvironmentVariable": false,
+        "enableNodeCliInspectArguments": false,
+        "enableEmbeddedAsarIntegrityValidation": true,
+        "onlyLoadAppFromAsar": true
+    },
+    "files": ["electron/**/*"],
+    "directories": {
+        "buildResources": "electron/build"
+    },
+    "win": {
+        "artifactName": "ReticulumMeshChat-v${version}-legacy-${os}.${ext}",
+        "target": [
+            {
+                "target": "portable"
+            },
+            {
+                "target": "nsis"
+            }
+        ],
+        "extraResources": [
+            {
+                "from": "build/exe/win32",
+                "to": "backend",
+                "filter": ["**/*"]
+            }
+        ]
+    },
+    "linux": {
+        "artifactName": "ReticulumMeshChatX-v${version}-legacy-${os}.${ext}",
+        "target": ["AppImage", "deb"],
+        "maintainer": "Sudo-Ivan",
+        "category": "Network",
+        "extraResources": [
+            {
+                "from": "build/exe/linux",
+                "to": "backend",
+                "filter": ["**/*"]
+            }
+        ]
+    },
+    "portable": {
+        "artifactName": "ReticulumMeshChatX-v${version}-legacy-${os}-portable.${ext}"
+    },
+    "nsis": {
+        "artifactName": "ReticulumMeshChatX-v${version}-legacy-${os}-installer.${ext}",
+        "oneClick": false,
+        "allowToChangeInstallationDirectory": true
+    }
+}