diff --git a/src/main/java/org/mobidgim/mobidigimproject/MobidigimProjectApplication.java b/src/main/java/org/mobidgim/mobidigimproject/MobidigimProjectApplication.java
index 705a770..9bac37d 100644
--- a/src/main/java/org/mobidgim/mobidigimproject/MobidigimProjectApplication.java
+++ b/src/main/java/org/mobidgim/mobidigimproject/MobidigimProjectApplication.java
@@ -2,13 +2,6 @@ package org.mobidgim.mobidigimproject;
 
 import org.springframework.boot.SpringApplication;
 import org.springframework.boot.autoconfigure.SpringBootApplication;
-import org.springframework.boot.autoconfigure.jdbc.DataSourceAutoConfiguration;
-import org.springframework.boot.autoconfigure.orm.jpa.HibernateJpaAutoConfiguration;
-
-import java.nio.file.Files;
-import java.nio.file.Path;
-import java.nio.file.Paths;
-
 @SpringBootApplication
 //        (exclude = {
 //        DataSourceAutoConfiguration.class,
@@ -18,21 +11,6 @@ import java.nio.file.Paths;
 public class MobidigimProjectApplication {
 
     public static void main(String[] args) {
-        ensureDbDirectory();
         SpringApplication.run(MobidigimProjectApplication.class, args);
     }
-
-    private static void ensureDbDirectory() {
-        try {
-            Path dbDir = Paths.get(System.getProperty("user.home"), "db");
-            Files.createDirectories(dbDir);
-            Path dbFile = dbDir.resolve("dynamic_data.db");
-            if (Files.notExists(dbFile)) {
-                Files.createFile(dbFile);
-            }
-        } catch (Exception e) {
-            throw new IllegalStateException("Failed to prepare SQLite DB file", e);
-        }
-    }
-
 }
diff --git a/src/main/java/org/mobidgim/mobidigimproject/config/DatabaseInitializer.java b/src/main/java/org/mobidgim/mobidigimproject/config/DatabaseInitializer.java
deleted file mode 100644
index 023c077..0000000
--- a/src/main/java/org/mobidgim/mobidigimproject/config/DatabaseInitializer.java
+++ /dev/null
@@ -1,24 +0,0 @@
-package org.mobidgim.mobidigimproject.config;
-
-import lombok.RequiredArgsConstructor;
-import org.springframework.boot.ApplicationArguments;
-import org.springframework.boot.ApplicationRunner;
-import org.springframework.jdbc.core.JdbcTemplate;
-import org.springframework.stereotype.Component;
-
-@Component
-@RequiredArgsConstructor
-public class DatabaseInitializer implements ApplicationRunner {
-
-    private final JdbcTemplate jdbcTemplate;
-
-    @Override
-    public void run(ApplicationArguments args) {
-        jdbcTemplate.execute(
-                "CREATE TABLE IF NOT EXISTS board_config (" +
-                        "\"key\" TEXT PRIMARY KEY, " +
-                        "\"value\" TEXT NOT NULL" +
-                        ")"
-        );
-    }
-}
diff --git a/src/main/java/org/mobidgim/mobidigimproject/model/device/enums/WiFiSecurity.java b/src/main/java/org/mobidgim/mobidigimproject/model/device/enums/WiFiSecurity.java
index f6af7e1..a7f0a41 100644
--- a/src/main/java/org/mobidgim/mobidigimproject/model/device/enums/WiFiSecurity.java
+++ b/src/main/java/org/mobidgim/mobidigimproject/model/device/enums/WiFiSecurity.java
@@ -1,14 +1,27 @@
 package org.mobidgim.mobidigimproject.model.device.enums;
 
+import com.fasterxml.jackson.annotation.JsonCreator;
 import com.fasterxml.jackson.annotation.JsonValue;
 import lombok.AllArgsConstructor;
 
 @AllArgsConstructor
 public enum WiFiSecurity {
     NONE("none"),
-    WPA_WPA2("wpa/wpa2");
+    WPA_WPA2("wpa/wpa2"),
+    WPA3("wpa3");
     private final String value;
 
+    @JsonCreator
+    public static WiFiSecurity fromValue(String value) {
+        for (WiFiSecurity security : values()) {
+            if (security.value.equalsIgnoreCase(String.valueOf(value).trim())) {
+                return security;
+            }
+        }
+
+        throw new IllegalArgumentException("Invalid wifiSecurity value: " + value);
+    }
+
     @JsonValue
     public String getValue() {
         return value;
diff --git a/src/main/resources/static/css/style.css b/src/main/resources/static/css/style.css
index 3972cb8..8b3a61c 100644
--- a/src/main/resources/static/css/style.css
+++ b/src/main/resources/static/css/style.css
@@ -210,7 +210,9 @@ details.nav {
 }
 
 .ssid-row select {
-    width: 100px;
+    width: 140px;
+    min-width: 140px;
+    flex: 0 0 140px;
     padding: 6px 8px;
     font-size: 16px;
     border: 1px solid #aaa;
diff --git a/src/main/resources/static/index.html b/src/main/resources/static/index.html
index d41c932..1bbb313 100644
--- a/src/main/resources/static/index.html
+++ b/src/main/resources/static/index.html
@@ -75,6 +75,7 @@
                         <select>
                             <option value="none">NONE</option>
                             <option value="wpa/wpa2">WPA/WPA2</option>
+                            <option value="wpa3">WPA3</option>
                         </select>
                     </div>
                 </template>
@@ -170,7 +171,7 @@
                         <div class="io-fieldset">
                             <div class="io-row"><span class="label-inline">Mode</span><span class="colon">:</span>
                                 <select id="rs485_mode">
-                                    <option value="">NONE</option>
+                                    <option value="" selected disabled hidden></option>
                                     <option value="half">half</option>
                                     <option value="full">full</option>
                                 </select>
@@ -199,7 +200,7 @@
                         <div class="io-fieldset">
                             <div class="io-row"><span class="label-inline">Can Type</span><span class="colon">:</span>
                                 <select id="can_bus_type">
-                                    <option value="">NONE</option>
+                                    <option value="" selected disabled hidden></option>
                                     <option value="extended">extended</option>
                                     <option value="standard">standard</option>
                                 </select>
@@ -207,7 +208,7 @@
 
                             <div class="io-row"><span class="label-inline">Can Speed</span><span class="colon">:</span>
                                 <select id="can_baudrate">
-                                    <option value="">NONE</option>
+                                    <option value="">AUTO</option>
                                     <option value="100">100kb/s</option>
                                     <option value="250">250kb/s</option>
                                     <option value="500">500kb/s</option>
diff --git a/src/main/resources/static/js/device/deviceData.js b/src/main/resources/static/js/device/deviceData.js
index d7ec9dc..1695f2f 100644
--- a/src/main/resources/static/js/device/deviceData.js
+++ b/src/main/resources/static/js/device/deviceData.js
@@ -48,6 +48,10 @@ export function createDeviceDataController({ ssidController }) {
         toggleNetInputs();
     }
 
+    function loadDefaults() {
+        loadFromData(cloneDeviceDefaults());
+    }
+
     function collectDeviceData() {
         const result = cloneDeviceDefaults();
 
@@ -87,12 +91,13 @@ export function createDeviceDataController({ ssidController }) {
 
     function initialize() {
         bindEvents();
-        loadFromData();
+        toggleNetInputs();
     }
 
     return {
         collectDeviceData,
         initialize,
+        loadDefaults,
         loadFromData,
         toggleNetInputs,
     };
diff --git a/src/main/resources/static/js/device/ssid.js b/src/main/resources/static/js/device/ssid.js
index c9b5a82..0f4b208 100644
--- a/src/main/resources/static/js/device/ssid.js
+++ b/src/main/resources/static/js/device/ssid.js
@@ -1,12 +1,32 @@
 import { cloneTemplateRow } from '../utils/dom.js';
 
 export function createSsidController({ listElement, templateElement, addButton, countryCodeInput }) {
+    function syncPasswordState(row) {
+        const passwordInput = row.querySelector('.ssid-pw');
+        const toggleButton = row.querySelector('.toggle-pw');
+        const securitySelect = row.querySelector('select');
+        const isNoneSecurity = (securitySelect?.value ?? 'none').toLowerCase() === 'none';
+
+        passwordInput.disabled = isNoneSecurity;
+
+        if (isNoneSecurity) {
+            passwordInput.value = '';
+            passwordInput.type = 'password';
+        }
+
+        if (toggleButton) {
+            toggleButton.disabled = isNoneSecurity;
+            toggleButton.textContent = 'show';
+        }
+    }
+
     function createRow(values = { wifi_ssid: '', wifi_passwd: '', wifi_security: 'none' }) {
         const row = cloneTemplateRow(templateElement);
 
         row.querySelector('.ssid-name').value = values.wifi_ssid ?? '';
         row.querySelector('.ssid-pw').value = values.wifi_passwd ?? '';
         row.querySelector('select').value = (values.wifi_security ?? 'none').toLowerCase();
+        syncPasswordState(row);
 
         const deleteButton = document.createElement('button');
         deleteButton.type = 'button';
@@ -61,6 +81,9 @@ export function createSsidController({ listElement, templateElement, addButton,
         listElement.addEventListener('click', (event) => {
             if (event.target.classList.contains('toggle-pw')) {
                 const passwordInput = event.target.closest('.ssid-row').querySelector('.ssid-pw');
+                if (passwordInput.disabled) {
+                    return;
+                }
                 passwordInput.type = passwordInput.type === 'password' ? 'text' : 'password';
                 event.target.textContent = passwordInput.type === 'password' ? 'show' : 'hide';
                 return;
@@ -71,6 +94,12 @@ export function createSsidController({ listElement, templateElement, addButton,
             }
         });
 
+        listElement.addEventListener('change', (event) => {
+            if (event.target.matches('.ssid-row select')) {
+                syncPasswordState(event.target.closest('.ssid-row'));
+            }
+        });
+
         countryCodeInput?.addEventListener('input', () => {
             countryCodeInput.value = countryCodeInput.value
                 .replace(/[^a-zA-Z]/g, '')
diff --git a/src/main/resources/static/js/main.js b/src/main/resources/static/js/main.js
index 51882f3..033d808 100644
--- a/src/main/resources/static/js/main.js
+++ b/src/main/resources/static/js/main.js
@@ -11,6 +11,56 @@ import { createProtocolDataController } from './protocol/protocolData.js';
 import { getRegisterConfigValidationError, isValidRegisterConfig } from './protocol/protocolValidation.js';
 import { byId, queryAll } from './utils/dom.js';
 
+function notifyLoadFailure(target, error) {
+    const statusMatch = /Request failed: (\d+)/.exec(String(error?.message ?? ''));
+    const statusText = statusMatch ? ` (HTTP ${statusMatch[1]})` : '';
+    const message = `${target} settings could not be loaded${statusText}. Please check the saved data on the backend.`;
+    console.error(message, error);
+    alert(message);
+}
+
+function isLegacySuccessMessage(data) {
+    return String(data?.message ?? '').trim().toLowerCase() === 'success';
+}
+
+function isLegacyProtocolPayload(data) {
+    if (!data || typeof data !== 'object' || Array.isArray(data)) {
+        return false;
+    }
+
+    return [
+        'protocol',
+        'dev_type',
+        'can_input',
+        'dr_on',
+        'odo_on',
+        'MEID',
+        'MODBUS',
+        'OPC_UA',
+        'CAN',
+    ].some((key) => Object.prototype.hasOwnProperty.call(data, key));
+}
+
+function isSaveSuccessful(type, response) {
+    if (!response.ok) {
+        return false;
+    }
+
+    if (response.data?.success === true) {
+        return true;
+    }
+
+    if (type === 'device' && isLegacySuccessMessage(response.data)) {
+        return true;
+    }
+
+    if (type === 'protocol' && isLegacyProtocolPayload(response.data)) {
+        return true;
+    }
+
+    return false;
+}
+
 async function initializeApp() {
     const navigation = createNavigation();
     const ssidController = createSsidController({
@@ -49,7 +99,9 @@ async function initializeApp() {
 
             protocolController.loadFromRegisterJson(data);
         },
-        getDownloadData: () => protocolController.collectProtocolData(),
+        getDownloadData: () => protocolController.normalizeRegisterForPost(
+            protocolController.collectProtocolData(),
+        ),
     });
 
     queryAll('.save-file').forEach((button) => {
@@ -71,8 +123,8 @@ async function initializeApp() {
                     saveProtocolConfig(protocolPayload),
                 ]);
 
-                const isDeviceSaved = deviceResponse.ok && deviceResponse.data?.success === true;
-                const isProtocolSaved = protocolResponse.ok && protocolResponse.data?.success === true;
+                const isDeviceSaved = isSaveSuccessful('device', deviceResponse);
+                const isProtocolSaved = isSaveSuccessful('protocol', protocolResponse);
 
                 if (isDeviceSaved && isProtocolSaved) {
                     alert('saved successfully');
@@ -97,9 +149,11 @@ async function initializeApp() {
         const deviceData = await loadDeviceConfig();
         if (deviceData) {
             deviceController.loadFromData(deviceData);
+        } else {
+            deviceController.loadDefaults();
         }
     } catch (error) {
-        console.error('Device load failed:', error);
+        notifyLoadFailure('Device', error);
     }
 
     try {
@@ -108,7 +162,7 @@ async function initializeApp() {
             protocolController.loadFromRegisterJson(protocolData);
         }
     } catch (error) {
-        console.error('Protocol load failed:', error);
+        notifyLoadFailure('Protocol', error);
     }
 }