diff --git a/.github/workflows/fdroid-repository.yml b/.github/workflows/fdroid-repository.yml
index 2e822ad42..006f893d7 100644
--- a/.github/workflows/fdroid-repository.yml
+++ b/.github/workflows/fdroid-repository.yml
@@ -22,6 +22,8 @@ concurrency:
 
 jobs:
   publish:
+    # The F-Droid repository metadata and Pages URL belong to the upstream project.
+    if: github.repository == 'yuga-hashimoto/and-code'
     runs-on: ubuntu-latest
     environment:
       name: github-pages
diff --git a/.github/workflows/release.yml b/.github/workflows/release.yml
index 2bda9be19..6f7f8db09 100644
--- a/.github/workflows/release.yml
+++ b/.github/workflows/release.yml
@@ -78,8 +78,7 @@ jobs:
           GITHUB_CLIENT_ID: ${{ vars.AND_CODE_GITHUB_CLIENT_ID }}
         run: |
           if [ -z "$GITHUB_CLIENT_ID" ]; then
-            echo "AND_CODE_GITHUB_CLIENT_ID repo variable is not set - the published APK would have no GitHub sign-in" >&2
-            exit 1
+            echo "::warning::AND_CODE_GITHUB_CLIENT_ID repo variable is not set - the published APK will have no GitHub sign-in"
           fi
            ./gradlew detekt spotlessCheck :app:lintGithubDebug :app:testGithubDebugUnitTest assembleGithubDebug assembleGithubRelease
           # Separate invocation, deliberately without GITHUB_CLIENT_ID: this is the same flavor and
diff --git a/.release-version b/.release-version
index 37a16fb03..5f67c69ea 100644
--- a/.release-version
+++ b/.release-version
@@ -1 +1 @@
-v1.2.27
+v1.2.27-dp1
diff --git a/app/build.gradle.kts b/app/build.gradle.kts
index 2921183bc..714ac06fa 100644
--- a/app/build.gradle.kts
+++ b/app/build.gradle.kts
@@ -12,17 +12,9 @@ plugins {
     id("com.google.firebase.crashlytics") apply false
 }
 
-// The fdroid flavor's dependencies already exclude Firebase (see the "githubImplementation"
-// entries below), but the google-services/crashlytics Gradle plugins process google-services.json
-// project-wide regardless of flavor, so they must be skipped outright rather than merely left off
-// a flavor's classpath. F-Droid's own build server builds with -Pandcode.fdroidBuild=true (see the
-// `gradleprops` field this project's future fdroiddata metadata will declare) to produce a build
-// with no Firebase/Google Play services code at all.
-val isFdroidBuild = providers.gradleProperty("andcode.fdroidBuild").orNull.toBoolean()
-if (!isFdroidBuild) {
-    apply(plugin = "com.google.gms.google-services")
-    apply(plugin = "com.google.firebase.crashlytics")
-}
+// Fork build (com.doublepi123.andcode): the google-services/crashlytics plugins are never applied
+// and no Firebase dependency is declared, so no flavor sends anything to Firebase. The github
+// flavor compiles the fdroid no-op diagnostics reporters (see sourceSets below).
 
 // When set, the native runtime payload (proot, libtalloc, libandroid-shmem) is built from
 // source by scripts/build_android_runtime_native_debs.sh before Gradle runs, and this build
@@ -130,11 +122,11 @@ android {
     }
 
     defaultConfig {
-        applicationId = "com.yugahashimoto.andcode"
+        applicationId = "com.doublepi123.andcode"
         minSdk = 26
         targetSdk = 35
         versionCode = 66
-        versionName = "1.2.27"
+        versionName = "1.2.27-dp1"
         buildConfigField("String", "GITHUB_CLIENT_ID", "\"$githubClientId\"")
 
         // The on-device runtime (see ANDROID_ABIS in scripts/prepare_android_runtime_native_libs.py)
@@ -153,13 +145,12 @@ android {
     flavorDimensions += "distribution"
     productFlavors {
         // Distributed via GitHub Releases (and the self-hosted F-Droid repo built from those
-        // release APKs). Includes Firebase Analytics/Crashlytics.
+        // release APKs). In this fork it ships without Firebase, like the fdroid flavor.
         create("github") {
             dimension = "distribution"
         }
         // Built from source by F-Droid's own build server for the official F-Droid catalog.
-        // Firebase is excluded entirely; see the isFdroidBuild guard above and the
-        // "githubImplementation" dependencies below.
+        // Firebase is excluded entirely.
         create("fdroid") {
             dimension = "distribution"
         }
@@ -233,6 +224,8 @@ android {
     }
     sourceSets {
         getByName("main").jniLibs.srcDir(generatedRuntimeJni)
+        // Fork: no Firebase, so the github flavor uses the fdroid no-op diagnostics reporters.
+        getByName("github").java.setSrcDirs(listOf("src/fdroid/java"))
     }
     packaging {
         resources {
@@ -255,14 +248,6 @@ dependencies {
     // Core Android
     implementation("androidx.core:core-ktx:1.15.0")
 
-    // Firebase (github flavor only - the fdroid flavor ships with no Firebase/Google Play
-    // services code so it can be built from source by F-Droid's own build server).
-    // 34.17.0 pulls Play Services Measurement compiled with Kotlin 2.2 metadata, while this
-    // project is currently on Kotlin 2.0/KSP 2.0. Keep the Firebase stack on the compatible
-    // 33.6 line until the Android build toolchain is upgraded together.
-    "githubImplementation"(platform("com.google.firebase:firebase-bom:33.6.0"))
-    "githubImplementation"("com.google.firebase:firebase-analytics")
-    "githubImplementation"("com.google.firebase:firebase-crashlytics")
     implementation("androidx.lifecycle:lifecycle-runtime-ktx:2.8.7")
     implementation("androidx.lifecycle:lifecycle-viewmodel-ktx:2.8.7")
     implementation("androidx.lifecycle:lifecycle-process:2.8.7")
diff --git a/benchmark/src/main/AndroidManifest.xml b/benchmark/src/main/AndroidManifest.xml
index e35ea96b7..400a97889 100644
--- a/benchmark/src/main/AndroidManifest.xml
+++ b/benchmark/src/main/AndroidManifest.xml
@@ -2,10 +2,10 @@
 <manifest xmlns:android="http://schemas.android.com/apk/res/android">
 
     <queries>
-        <package android:name="com.yugahashimoto.andcode" />
+        <package android:name="com.doublepi123.andcode" />
     </queries>
 
     <instrumentation
         android:name="androidx.test.runner.AndroidJUnitRunner"
-        android:targetPackage="com.yugahashimoto.andcode" />
+        android:targetPackage="com.doublepi123.andcode" />
 </manifest>
diff --git a/benchmark/src/main/java/com/yugahashimoto/andcode/benchmark/BaselineProfileGenerator.kt b/benchmark/src/main/java/com/yugahashimoto/andcode/benchmark/BaselineProfileGenerator.kt
index 7cb9745bb..776e393f3 100644
--- a/benchmark/src/main/java/com/yugahashimoto/andcode/benchmark/BaselineProfileGenerator.kt
+++ b/benchmark/src/main/java/com/yugahashimoto/andcode/benchmark/BaselineProfileGenerator.kt
@@ -22,7 +22,7 @@ class BaselineProfileGenerator {
         rule.collect(
             packageName =
                 InstrumentationRegistry.getArguments().getString("targetAppId")
-                    ?: "com.yugahashimoto.andcode",
+                    ?: "com.doublepi123.andcode",
             includeInStartupProfile = true,
         ) {
             pressHome()
diff --git a/benchmark/src/main/java/com/yugahashimoto/andcode/benchmark/StartupProfileGenerator.kt b/benchmark/src/main/java/com/yugahashimoto/andcode/benchmark/StartupProfileGenerator.kt
index 26c9195e6..a5d7ce9ee 100644
--- a/benchmark/src/main/java/com/yugahashimoto/andcode/benchmark/StartupProfileGenerator.kt
+++ b/benchmark/src/main/java/com/yugahashimoto/andcode/benchmark/StartupProfileGenerator.kt
@@ -22,7 +22,7 @@ class StartupProfileGenerator {
     @Test
     fun startupAndChatNavigation() {
         rule.measureRepeated(
-            packageName = "com.yugahashimoto.andcode",
+            packageName = "com.doublepi123.andcode",
             metrics = listOf(StartupTimingMetric()),
             iterations = 5,
             startupMode = StartupMode.COLD,