diff --git a/examples/crash_reporter/backend/scripts/install-be-builder-nginx.sh b/examples/crash_reporter/backend/scripts/install-be-builder-nginx.sh
new file mode 100755
index 0000000..0f4c17a
--- /dev/null
+++ b/examples/crash_reporter/backend/scripts/install-be-builder-nginx.sh
@@ -0,0 +1,57 @@
+#!/usr/bin/env bash
+# Run on Alpine BE (artc0) as root — installs builder nginx + verifies.
+set -euo pipefail
+
+WEB="/var/www/localhost/htdocs/apps/app/androidcast_project"
+BUILD_PUBLIC="$WEB/android_cast/examples/build_console/backend/public"
+APPS_CONF="/etc/nginx/conf.d/apps.conf"
+BUILDER_FRAG="/etc/nginx/conf.d/apps_builder.frag"
+
+if [[ ! -f "$BUILD_PUBLIC/index.php" ]]; then
+  echo "Missing $BUILD_PUBLIC/index.php" >&2
+  exit 1
+fi
+
+cat > "$BUILDER_FRAG" << EOF
+location = /app/androidcast_project/build {
+	return 301 /app/androidcast_project/build/;
+}
+
+location ^~ /app/androidcast_project/build/assets/ {
+	alias $BUILD_PUBLIC/assets/;
+}
+
+location ^~ /app/androidcast_project/build/ {
+	include fastcgi_params;
+	fastcgi_pass unix:/run/php-fpm.socket;
+	fastcgi_param SCRIPT_FILENAME $BUILD_PUBLIC/index.php;
+	fastcgi_param SCRIPT_NAME /app/androidcast_project/build/index.php;
+	fastcgi_param REQUEST_URI \$request_uri;
+	client_max_body_size 512m;
+	fastcgi_read_timeout 1800s;
+}
+EOF
+
+echo "Wrote $BUILDER_FRAG"
+grep SCRIPT_FILENAME "$BUILDER_FRAG"
+
+if ! grep -q 'include /etc/nginx/conf.d/apps_builder.frag' "$APPS_CONF"; then
+  echo "WARN: $APPS_CONF does not include apps_builder.frag inside listen 443 server block." >&2
+  echo "Add: include /etc/nginx/conf.d/apps_builder.frag;  before the closing } of the 443 server." >&2
+fi
+
+nginx -t
+rc-service nginx reload
+
+echo
+echo "=== effective build locations ==="
+nginx -T 2>/dev/null | grep -A6 'androidcast_project/build/' | head -40
+
+echo
+echo "=== curl BE :443 ==="
+curl -sSI -H 'Host: apps.f0xx.org' 'https://127.0.0.1/app/androidcast_project/build/' -k \
+  | grep -E 'HTTP|location|x-powered-by' || true
+
+echo
+echo "If still 404, check error log:"
+echo "  tail -20 /var/log/nginx/apps.intra.raptor.org.error_log"