diff --git a/controller/app/build.gradle b/controller/app/build.gradle
index ba1c7736d..ab3e9daba 100644
--- a/controller/app/build.gradle
+++ b/controller/app/build.gradle
@@ -1,7 +1,8 @@
 plugins {
     id 'com.android.application'
-    // ADFA-4466 Phase 1: Firebase Analytics.
-    id 'com.google.gms.google-services'
+    // ADFA-4466 Phase 1: Firebase Analytics. The google-services plugin fails the build when
+    // google-services.json is absent, so it is applied CONDITIONALLY at the bottom of this file
+    // (present -> Firebase on; absent -> AnalyticsClient compiles out and the build still works).
 }
 
 // 1. AUTO-VERSIONING MAP (Must be defined outside the 'android' block)
@@ -24,6 +25,12 @@ def gitShortSha = {
 }
 ext.gitSha = gitShortSha()
 
+// Firebase is OPTIONAL for local/contributor builds. google-services.json holds the real project keys
+// and is gitignored, so a fresh clone doesn't have it. When it's absent we skip the google-services
+// plugin (which would otherwise fail the build) and flag AnalyticsClient off via BuildConfig so it never
+// touches the uninitialized Firebase SDK. Set the file to enable analytics for a release build.
+def hasGoogleServices = file("google-services.json").exists()
+
 android {
     // 2. Identity
     namespace 'org.iiab.controller'
@@ -45,6 +52,8 @@ android {
                 : (project.ext.gitSha ? "-${project.ext.gitSha}" : "")
         versionName "v0.7.0-beta${ciSuffix}"
         buildConfigField "String", "GIT_SHA", "\"${project.ext.gitSha}\""
+        // True only when google-services.json is present, so AnalyticsClient can compile out cleanly.
+        buildConfigField "boolean", "ANALYTICS_ENABLED", "${hasGoogleServices}"
 
         setProperty("archivesBaseName", "$applicationId-$versionName")
 
@@ -753,3 +762,14 @@ task refreshKolibriCatalog {
         }
     }
 }
+
+// ADFA-4466 / build resilience: apply the Firebase google-services plugin only when its config file is
+// present. Without it the plugin fails the build; skipping it lets contributors build a working APK with
+// analytics compiled out (BuildConfig.ANALYTICS_ENABLED = false). Applied at the bottom, as the plugin
+// expects, so it processes the already-configured android block.
+if (hasGoogleServices) {
+    apply plugin: 'com.google.gms.google-services'
+    logger.lifecycle("K2Go: google-services.json found — Firebase Analytics enabled.")
+} else {
+    logger.lifecycle("K2Go: google-services.json not found — building WITHOUT Firebase (analytics disabled).")
+}
diff --git a/controller/app/src/main/java/org/iiab/controller/SetupSectionFragment.java b/controller/app/src/main/java/org/iiab/controller/SetupSectionFragment.java
index 9e13571cf..6f108dcb8 100644
--- a/controller/app/src/main/java/org/iiab/controller/SetupSectionFragment.java
+++ b/controller/app/src/main/java/org/iiab/controller/SetupSectionFragment.java
@@ -206,6 +206,11 @@ private void persistSelectedLanguage() {
      * the consent and proceeds. Shown at most once (guarded by a flag).
      */
     private void maybeShowAnalyticsEnrollment() {
+        // ADFA-5337: no analytics compiled in (no google-services.json) → nothing to consent to; skip.
+        if (!BuildConfig.ANALYTICS_ENABLED) {
+            completeSetup();
+            return;
+        }
         SharedPreferences delivery = requireContext().getSharedPreferences(
                 DELIVERY_PREFS, Context.MODE_PRIVATE);
         if (delivery.getBoolean(KEY_ENROLLMENT_SHOWN, false)) {
diff --git a/controller/app/src/main/java/org/iiab/controller/analytics/AnalyticsClient.java b/controller/app/src/main/java/org/iiab/controller/analytics/AnalyticsClient.java
index b9068bfea..c348ce753 100644
--- a/controller/app/src/main/java/org/iiab/controller/analytics/AnalyticsClient.java
+++ b/controller/app/src/main/java/org/iiab/controller/analytics/AnalyticsClient.java
@@ -6,6 +6,7 @@
 
 import com.google.firebase.analytics.FirebaseAnalytics;
 
+import org.iiab.controller.BuildConfig;
 import org.iiab.controller.analytics.domain.AnalyticsBuckets;
 import org.iiab.controller.delivery.data.AnalyticsConsent;
 import org.iiab.controller.delivery.data.InstallId;
@@ -48,6 +49,9 @@ public static AnalyticsClient with(Context ctx) {
      * anywhere (e.g. Application start, or right after the consent toggle changes).
      */
     public void applyConsent() {
+        if (!BuildConfig.ANALYTICS_ENABLED) {
+            return;   // built without google-services.json → Firebase not configured; nothing to sync
+        }
         FirebaseAnalytics.getInstance(app).setAnalyticsCollectionEnabled(AnalyticsConsent.isEnabled(app));
     }
 
@@ -179,8 +183,13 @@ public void logModuleInstall(String module, boolean success) {
 
     // ------------------------------------------------------------------- internals
 
-    /** True only when the operator opted in; also keeps the SDK flag in sync. */
+    /** True only when the operator opted in AND Firebase is configured in this build; also keeps the SDK
+     *  flag in sync. When built without google-services.json, this short-circuits so no code path ever
+     *  touches the uninitialized Firebase SDK (every public logging method gates through here). */
     private boolean gate() {
+        if (!BuildConfig.ANALYTICS_ENABLED) {
+            return false;   // no google-services.json → analytics compiled out
+        }
         boolean consent = AnalyticsConsent.isEnabled(app);
         FirebaseAnalytics.getInstance(app).setAnalyticsCollectionEnabled(consent);
         return consent;
diff --git a/controller/app/src/main/java/org/iiab/controller/redesign/SettingsSubFragment.java b/controller/app/src/main/java/org/iiab/controller/redesign/SettingsSubFragment.java
index 32cd21dd2..8e8099723 100644
--- a/controller/app/src/main/java/org/iiab/controller/redesign/SettingsSubFragment.java
+++ b/controller/app/src/main/java/org/iiab/controller/redesign/SettingsSubFragment.java
@@ -190,10 +190,14 @@ private void buildAbout(Context ctx, LinearLayout list) {
             }
         });
         SettingsUi.row(ctx, list, getString(R.string.k2go_settings_permissions), null, null, v -> openAppSettings(ctx));
-        SettingsUi.toggle(ctx, list, getString(R.string.k2go_settings_usage_stats), AnalyticsConsent.isEnabled(ctx), checked -> {
-            AnalyticsConsent.setEnabled(ctx, checked);
-            org.iiab.controller.analytics.AnalyticsClient.with(ctx).applyConsent();
-        });
+        // ADFA-5337: hide the usage-statistics toggle when analytics is compiled out (no
+        // google-services.json), since there's nothing to share and the switch would do nothing.
+        if (org.iiab.controller.BuildConfig.ANALYTICS_ENABLED) {
+            SettingsUi.toggle(ctx, list, getString(R.string.k2go_settings_usage_stats), AnalyticsConsent.isEnabled(ctx), checked -> {
+                AnalyticsConsent.setEnabled(ctx, checked);
+                org.iiab.controller.analytics.AnalyticsClient.with(ctx).applyConsent();
+            });
+        }
         SettingsUi.preview(ctx, list, getString(R.string.k2go_settings_licenses), null);
         SettingsUi.preview(ctx, list, getString(R.string.k2go_settings_privacy), null);
     }
diff --git a/controller/app/src/main/java/org/iiab/controller/redesign/WizardActivity.java b/controller/app/src/main/java/org/iiab/controller/redesign/WizardActivity.java
index be6c24c95..dcd133300 100644
--- a/controller/app/src/main/java/org/iiab/controller/redesign/WizardActivity.java
+++ b/controller/app/src/main/java/org/iiab/controller/redesign/WizardActivity.java
@@ -198,6 +198,8 @@ private void onPrimary() {
     /** One-time usage-stats consent prompt; runs {@code onDone} after the choice (or immediately
      *  if already asked here or in the legacy flow). Reuses the analytics_enroll_* strings. */
     private void maybeAskAnalytics(Runnable onDone) {
+        // ADFA-5337: no analytics compiled in (no google-services.json) → nothing to consent to; skip.
+        if (!org.iiab.controller.BuildConfig.ANALYTICS_ENABLED) { onDone.run(); return; }
         if (AnalyticsConsent.wasAsked(this)) { onDone.run(); return; }
         new MaterialAlertDialogBuilder(this)
                 .setTitle(R.string.analytics_enroll_title)
diff --git a/controller/app/src/main/java/org/iiab/controller/settings/AboutFragment.java b/controller/app/src/main/java/org/iiab/controller/settings/AboutFragment.java
index c7295cad9..b0b79e452 100644
--- a/controller/app/src/main/java/org/iiab/controller/settings/AboutFragment.java
+++ b/controller/app/src/main/java/org/iiab/controller/settings/AboutFragment.java
@@ -33,13 +33,22 @@ public void onViewCreated(@NonNull View view, @Nullable Bundle savedInstanceStat
         TextView versionView = view.findViewById(R.id.about_version);
         versionView.setText(getString(R.string.about_version, appVersionName()));
 
-        SwitchCompat analytics = view.findViewById(R.id.switch_analytics_consent);
-        analytics.setChecked(AnalyticsConsent.isEnabled(requireContext()));
-        analytics.setOnCheckedChangeListener(
-                (btn, checked) -> {
-                    AnalyticsConsent.setEnabled(requireContext(), checked);
-                    org.iiab.controller.analytics.AnalyticsClient.with(requireContext()).applyConsent();
-                });
+        // ADFA-5337: no analytics compiled in (no google-services.json) → hide the whole opt-in block,
+        // since there's nothing to share and the switch would do nothing.
+        if (!org.iiab.controller.BuildConfig.ANALYTICS_ENABLED) {
+            View row = view.findViewById(R.id.analytics_consent_row);
+            View desc = view.findViewById(R.id.analytics_consent_desc);
+            if (row != null) row.setVisibility(View.GONE);
+            if (desc != null) desc.setVisibility(View.GONE);
+        } else {
+            SwitchCompat analytics = view.findViewById(R.id.switch_analytics_consent);
+            analytics.setChecked(AnalyticsConsent.isEnabled(requireContext()));
+            analytics.setOnCheckedChangeListener(
+                    (btn, checked) -> {
+                        AnalyticsConsent.setEnabled(requireContext(), checked);
+                        org.iiab.controller.analytics.AnalyticsClient.with(requireContext()).applyConsent();
+                    });
+        }
     }
 
     private String appVersionName() {
diff --git a/controller/app/src/main/res/layout/fragment_about.xml b/controller/app/src/main/res/layout/fragment_about.xml
index 9ddef7497..3a47432d6 100644
--- a/controller/app/src/main/res/layout/fragment_about.xml
+++ b/controller/app/src/main/res/layout/fragment_about.xml
@@ -21,7 +21,8 @@
     <View android:layout_width="match_parent" android:layout_height="1dp"
         android:layout_marginTop="24dp" android:background="@color/chrome_ripple"/>
 
-    <LinearLayout android:layout_width="match_parent" android:layout_height="wrap_content"
+    <LinearLayout android:id="@+id/analytics_consent_row"
+        android:layout_width="match_parent" android:layout_height="wrap_content"
         android:orientation="horizontal" android:gravity="center_vertical"
         android:layout_marginTop="20dp">
         <TextView android:layout_width="0dp" android:layout_height="wrap_content"
@@ -32,7 +33,8 @@
             android:id="@+id/switch_analytics_consent"
             android:layout_width="wrap_content" android:layout_height="wrap_content"/>
     </LinearLayout>
-    <TextView android:layout_width="match_parent" android:layout_height="wrap_content"
+    <TextView android:id="@+id/analytics_consent_desc"
+        android:layout_width="match_parent" android:layout_height="wrap_content"
         android:layout_marginTop="6dp"
         android:text="@string/settings_analytics_desc"
         android:textSize="13sp"/>