diff --git a/app/build.gradle b/app/build.gradle
index c54e60a..396a0e6 100644
--- a/app/build.gradle
+++ b/app/build.gradle
@@ -34,8 +34,8 @@ android {
         applicationId "com.stinnesbeck.nilsmg4"
         minSdk 27
         targetSdk 36
-        versionCode 93
-        versionName "2.17.4"
+        versionCode 94
+        versionName "2.17.5"
 
         // Nothing about the server ships in the APK: its URL and ingest token are entered in
         // the app's Server tab (ServerConfig), and the database is only reachable by the server.
diff --git a/app/src/main/java/com/evsuite/abrp/MainActivity.java b/app/src/main/java/com/evsuite/abrp/MainActivity.java
index 00efca0..afffebc 100644
--- a/app/src/main/java/com/evsuite/abrp/MainActivity.java
+++ b/app/src/main/java/com/evsuite/abrp/MainActivity.java
@@ -114,8 +114,10 @@ public class MainActivity extends AppCompatActivity {
     private ChargingGraphView chargeGraph;
 
     /** Server page. */
-    private TextInputLayout serverUrlLayout, serverTokenLayout, installationIdLayout;
-    private TextInputEditText serverUrlInput, serverTokenInput, installationIdInput;
+    private TextInputLayout serverUrlLayout, serverTokenLayout;
+    private TextInputEditText serverUrlInput, serverTokenInput;
+    /** Shown, not edited: derived from the head unit (ServerConfig.installationIdFor). */
+    private TextView installationIdText;
     private View connectionStatusRow, connectionIndicator;
     private TextView connectionStatusText;
 
@@ -460,19 +462,17 @@ public class MainActivity extends AppCompatActivity {
     private void bindServerPane() {
         serverUrlLayout      = serverPane.findViewById(R.id.server_url_layout);
         serverTokenLayout    = serverPane.findViewById(R.id.server_token_layout);
-        installationIdLayout = serverPane.findViewById(R.id.installation_id_layout);
         serverUrlInput       = serverPane.findViewById(R.id.server_url_input);
         serverTokenInput     = serverPane.findViewById(R.id.server_token_input);
-        installationIdInput  = serverPane.findViewById(R.id.installation_id_input);
+        installationIdText   = serverPane.findViewById(R.id.installation_id_text);
         connectionStatusRow  = serverPane.findViewById(R.id.connection_status_row);
         connectionIndicator  = serverPane.findViewById(R.id.connection_indicator);
         connectionStatusText = serverPane.findViewById(R.id.connection_status_text);
         showServerConfig();
-        ((TextView) serverPane.findViewById(R.id.import_hint))
-                .setText(getString(R.string.import_hint, configDirHint()));
 
         serverPane.findViewById(R.id.server_save_button).setOnClickListener(v -> {
-            if (saveServerConfig(textOf(serverUrlInput), textOf(serverTokenInput), textOf(installationIdInput))) {
+            if (saveServerConfig(textOf(serverUrlInput), textOf(serverTokenInput),
+                    ServerConfig.get(this).installationId)) {
                 setConnectionStatus(COLOR_OK, getString(R.string.server_saved));
             }
         });
@@ -485,7 +485,7 @@ public class MainActivity extends AppCompatActivity {
         ServerConfig config = ServerConfig.get(this);
         serverUrlInput.setText(config.url);
         serverTokenInput.setText(config.token);
-        installationIdInput.setText(config.installationId);
+        installationIdText.setText(getString(R.string.installation_id_info, config.installationId));
     }
 
     /** Validates, marks the bad fields, and saves only when all three are good. */
@@ -495,9 +495,12 @@ public class MainActivity extends AppCompatActivity {
         String id = rawId == null ? "" : rawId.trim().toLowerCase(java.util.Locale.US);
         serverUrlLayout.setError(url == null ? getString(R.string.server_err_url) : null);
         serverTokenLayout.setError(ServerConfig.isValidToken(token) ? null : getString(R.string.server_err_token));
-        installationIdLayout.setError(ServerConfig.isValidInstallationId(id)
-                ? null : getString(R.string.server_err_installation_id));
-        if (url == null || !ServerConfig.isValidToken(token) || !ServerConfig.isValidInstallationId(id)) return false;
+        // Only an imported config file can bring a different id; the field is not editable.
+        if (!ServerConfig.isValidInstallationId(id)) {
+            setConnectionStatus(COLOR_ERROR, getString(R.string.server_err_installation_id));
+            return false;
+        }
+        if (url == null || !ServerConfig.isValidToken(token)) return false;
         ServerConfig.save(this, url, token, id);
         if (consumptionCloudClient != null) consumptionCloudClient.invalidateHistory();
         showServerConfig();
@@ -513,15 +516,11 @@ public class MainActivity extends AppCompatActivity {
     private void testConnection() {
         String url = ServerConfig.normalizeUrl(textOf(serverUrlInput));
         String token = textOf(serverTokenInput);
-        String id = textOf(installationIdInput).toLowerCase(java.util.Locale.US);
+        String id = ServerConfig.get(this).installationId;
         if (url == null) {
             serverUrlLayout.setError(getString(R.string.server_err_url));
             return;
         }
-        if (!ServerConfig.isValidInstallationId(id)) {
-            installationIdLayout.setError(getString(R.string.server_err_installation_id));
-            return;
-        }
         setConnectionStatus(COLOR_PENDING, getString(R.string.conn_testing));
         new Thread(() -> {
             String message;
@@ -563,9 +562,7 @@ public class MainActivity extends AppCompatActivity {
             return;
         }
         serverUrlLayout.setError(null);
-        String typedId = textOf(installationIdInput).toLowerCase(java.util.Locale.US);
-        String installationId = ServerConfig.isValidInstallationId(typedId)
-                ? typedId : ServerConfig.get(this).installationId;
+        String installationId = ServerConfig.get(this).installationId;
 
         PhoneQrDialog ui = new PhoneQrDialog(R.string.pair_title, R.string.pair_starting);
         final boolean[] cancelled = ui.cancelled;
@@ -973,7 +970,6 @@ public class MainActivity extends AppCompatActivity {
                 // Show what the file said, so the marked field is the one to fix in the file.
                 if (config.serverUrl != null) serverUrlInput.setText(config.serverUrl);
                 if (config.token != null) serverTokenInput.setText(config.token);
-                if (config.installationId != null) installationIdInput.setText(config.installationId);
                 return false;
             }
         }
diff --git a/app/src/main/res/layout/pane_server.xml b/app/src/main/res/layout/pane_server.xml
index 850ed83..51b5762 100644
--- a/app/src/main/res/layout/pane_server.xml
+++ b/app/src/main/res/layout/pane_server.xml
@@ -1,6 +1,6 @@
 <?xml version="1.0" encoding="utf-8"?>
 <com.evsuite.abrp.StableScrollView xmlns:android="http://schemas.android.com/apk/res/android" xmlns:app="http://schemas.android.com/apk/res-auto" android:layout_width="match_parent" android:layout_height="match_parent" android:fillViewport="true" android:clipToPadding="false">
-    <LinearLayout android:layout_width="match_parent" android:layout_height="wrap_content" android:orientation="vertical" android:padding="24dp">
+    <LinearLayout android:layout_width="match_parent" android:layout_height="wrap_content" android:orientation="vertical" android:paddingStart="24dp" android:paddingEnd="24dp" android:paddingTop="12dp" android:paddingBottom="12dp">
         <LinearLayout android:layout_width="match_parent" android:layout_height="wrap_content" android:orientation="vertical" android:padding="24dp" android:background="@drawable/bg_glass">
             <TextView android:layout_width="match_parent" android:layout_height="wrap_content" android:text="@string/server_card_title" android:textAppearance="@style/Text.EV.Eyebrow" />
             <com.google.android.material.textfield.TextInputLayout android:id="@+id/server_url_layout" style="@style/Widget.EV.Input" android:layout_width="match_parent" android:layout_height="wrap_content" android:layout_marginTop="18dp" android:hint="@string/hint_server_url" app:helperText="@string/helper_server_url">
@@ -11,22 +11,16 @@
             <com.google.android.material.textfield.TextInputLayout android:id="@+id/server_token_layout" style="@style/Widget.EV.Input" android:layout_width="match_parent" android:layout_height="wrap_content" android:layout_marginTop="18dp" android:hint="@string/hint_server_token" app:endIconMode="password_toggle" app:endIconMinSize="72dp" app:helperText="@string/helper_server_token">
                 <com.google.android.material.textfield.TextInputEditText android:id="@+id/server_token_input" android:layout_width="match_parent" android:layout_height="wrap_content" android:minHeight="72dp" android:inputType="textPassword" android:singleLine="true" android:textSize="20sp" />
             </com.google.android.material.textfield.TextInputLayout>
-            <com.google.android.material.textfield.TextInputLayout android:id="@+id/installation_id_layout" style="@style/Widget.EV.Input" android:layout_width="match_parent" android:layout_height="wrap_content" android:layout_marginTop="18dp" android:hint="@string/hint_installation_id" app:helperText="@string/helper_installation_id">
-                <com.google.android.material.textfield.TextInputEditText android:id="@+id/installation_id_input" android:layout_width="match_parent" android:layout_height="wrap_content" android:minHeight="72dp" android:inputType="text" android:singleLine="true" android:textSize="18sp" android:fontFamily="monospace" />
-            </com.google.android.material.textfield.TextInputLayout>
-            <com.google.android.material.button.MaterialButton android:id="@+id/server_save_button" style="@style/Widget.EV.Button" android:layout_width="match_parent" android:layout_height="wrap_content" android:text="@string/btn_save" android:layout_marginTop="20dp" />
-            <com.google.android.material.button.MaterialButton android:id="@+id/server_test_button" style="@style/Widget.EV.Button.Outlined" android:layout_width="match_parent" android:layout_height="wrap_content" android:text="@string/btn_test" android:layout_marginTop="8dp" />
+            <TextView android:id="@+id/installation_id_text" android:layout_width="match_parent" android:layout_height="wrap_content" android:layout_marginTop="14dp" android:textAppearance="@style/Text.EV.Secondary" android:textIsSelectable="true" />
+            <LinearLayout android:layout_width="match_parent" android:layout_height="wrap_content" android:layout_marginTop="16dp" android:orientation="horizontal">
+                <com.google.android.material.button.MaterialButton android:id="@+id/server_save_button" style="@style/Widget.EV.Button" android:layout_width="0dp" android:layout_weight="1" android:layout_height="wrap_content" android:text="@string/btn_save" android:layout_marginEnd="12dp" />
+                <com.google.android.material.button.MaterialButton android:id="@+id/server_test_button" style="@style/Widget.EV.Button.Outlined" android:layout_width="0dp" android:layout_weight="1" android:layout_height="wrap_content" android:text="@string/btn_test" android:layout_marginEnd="12dp" />
+                <com.google.android.material.button.MaterialButton android:id="@+id/import_button" style="@style/Widget.EV.Button.Outlined" android:layout_width="0dp" android:layout_weight="1" android:layout_height="wrap_content" android:text="@string/btn_import" />
+            </LinearLayout>
             <LinearLayout android:id="@+id/connection_status_row" android:layout_width="match_parent" android:layout_height="wrap_content" android:layout_marginTop="16dp" android:gravity="center_vertical" android:orientation="horizontal" android:visibility="gone">
                 <View android:id="@+id/connection_indicator" android:layout_width="10dp" android:layout_height="10dp" android:layout_marginEnd="12dp" android:background="@drawable/circle_indicator" />
                 <TextView android:id="@+id/connection_status_text" android:layout_width="match_parent" android:layout_height="wrap_content" android:textAppearance="@style/Text.EV.Body" />
             </LinearLayout>
         </LinearLayout>
-        <Space android:layout_width="1dp" android:layout_height="20dp" />
-        <LinearLayout android:layout_width="match_parent" android:layout_height="wrap_content" android:orientation="vertical" android:padding="24dp" android:background="@drawable/bg_glass">
-            <TextView android:layout_width="match_parent" android:layout_height="wrap_content" android:text="@string/design_private_title" android:textAppearance="@style/Text.EV.Title" />
-            <TextView android:layout_width="match_parent" android:layout_height="wrap_content" android:text="@string/design_private_body" android:textAppearance="@style/Text.EV.Secondary" android:layout_marginTop="16dp" android:lineSpacingMultiplier="1.3" />
-            <com.google.android.material.button.MaterialButton android:id="@+id/import_button" style="@style/Widget.EV.Button.Outlined" android:layout_width="match_parent" android:layout_height="wrap_content" android:text="@string/btn_import" android:layout_marginTop="24dp" />
-            <TextView android:id="@+id/import_hint" android:layout_width="match_parent" android:layout_height="wrap_content" android:layout_marginTop="12dp" android:textAppearance="@style/Text.EV.Secondary" android:textIsSelectable="true" />
-        </LinearLayout>
     </LinearLayout>
 </com.evsuite.abrp.StableScrollView>
diff --git a/app/src/main/res/values/strings.xml b/app/src/main/res/values/strings.xml
index 6380df6..0bf61cb 100644
--- a/app/src/main/res/values/strings.xml
+++ b/app/src/main/res/values/strings.xml
@@ -60,6 +60,7 @@
     <string name="btn_save">Save</string>
     <string name="btn_test">Test connection</string>
     <string name="btn_import">Import from file</string>
+    <string name="installation_id_info">Installation ID %1$s · derived from the head unit; your data is stored under it</string>
 
     <!-- Server page -->
     <string name="server_card_title">Car server</string>
@@ -67,8 +68,6 @@
     <string name="helper_server_url">For example https://car.k8s.stinnesbeck.com</string>
     <string name="hint_server_token">Ingest token</string>
     <string name="helper_server_token">The server\'s INGEST_TOKEN, at least 24 characters</string>
-    <string name="hint_installation_id">Installation ID</string>
-    <string name="helper_installation_id">Your data is stored under this ID. Keep it when reinstalling.</string>
     <string name="server_err_url">Enter an https:// URL</string>
     <string name="btn_pair">Pair with phone</string>
     <string name="pair_hint">Shows a QR code: scan it with your phone and approve with the approval password. The token below is then filled in for you.</string>
@@ -92,7 +91,6 @@
     <string name="server_err_installation_id">Not a valid ID (UUID)</string>
     <string name="server_saved">Server settings saved</string>
     <string name="server_not_configured">Server not configured — open the Server tab</string>
-    <string name="import_hint">Put a text file with server_url and token in %1$s (on the head unit or a USB stick in the same folder), then press Import.</string>
 
     <!-- Config file import -->
     <string name="import_ok">Config imported and saved — press Test to verify</string>
diff --git a/app/src/main/res/values/strings_design.xml b/app/src/main/res/values/strings_design.xml
index 9f4d9e0..1c8dc16 100644
--- a/app/src/main/res/values/strings_design.xml
+++ b/app/src/main/res/values/strings_design.xml
@@ -8,7 +8,7 @@
   <string name="design_overview_title">Your drive at a glance.</string>
   <string name="design_overview_subtitle">Data from your car, all in one place.</string>
   <string name="design_server_title">Where your data goes.</string>
-  <string name="design_server_subtitle">Your own server stores it and passes it on to ABRP.</string>
+  <string name="design_server_subtitle">Your own server stores it; the car sends live data to ABRP itself.</string>
   <string name="design_service_title">Live data.</string>
   <string name="design_service_subtitle">Where your car\'s live data goes, and how often.</string>
   <string name="design_settings_title">Settings.</string>
@@ -19,8 +19,6 @@
   <string name="design_energy">VEHICLE INFO</string>
   <string name="design_tires">TIRE PRESSURES</string>
   <string name="design_account">SERVER LINK</string>
-  <string name="design_private_title">Your private connection.</string>
-  <string name="design_private_body">The token lets the car write to your server. It is stored encrypted on this device; your ABRP credentials stay on the server.</string>
   <string name="design_no_data">Values that cannot be read are shown as &#x2014;.</string>
   <string name="design_service_controls">LIVE DATA</string>
   <string name="design_abrp_title">ABRP, DIRECTLY FROM THE CAR</string>