diff --git a/zygisk/module/action.sh b/zygisk/module/action.sh
index c3ea8c1a3..58b7d206d 100644
--- a/zygisk/module/action.sh
+++ b/zygisk/module/action.sh
@@ -1,4 +1,15 @@
 MANAGER_PACKAGE_NAME="@MANAGER_PACKAGE_NAME@"
 INJECTED_PACKAGE_NAME="@INJECTED_PACKAGE_NAME@"
 
+# The manager also ships inside this module as manager.apk and may have been
+# installed as a regular package. When it has, launching its activity directly
+# is more reliable than the injection path below, which needs
+# ${INJECTED_PACKAGE_NAME} to start a 2D activity at all and to receive the
+# injected manager dex -- neither holds in every environment (some systems
+# never let the shell host an activity, and dynamic code loading restrictions
+# can block the dex the way GrapheneOS does, see #805).
+if pm path "$MANAGER_PACKAGE_NAME" >/dev/null 2>&1; then
+  am start -n "$MANAGER_PACKAGE_NAME/.ui.MainActivity" >/dev/null 2>&1 && exit 0
+fi
+
 am start -c "${MANAGER_PACKAGE_NAME}.LAUNCH_MANAGER" "${INJECTED_PACKAGE_NAME}/.BugreportWarningActivity"
diff --git a/zygisk/module/service.sh b/zygisk/module/service.sh
index e49f8859b..4f2cd362f 100644
--- a/zygisk/module/service.sh
+++ b/zygisk/module/service.sh
@@ -1,6 +1,16 @@
-# Extract the directory path and change directory 
+# Extract the directory path and change directory
 MODDIR="${0%/*}"
 cd "$MODDIR" || exit 1
 
-# Start the daemon directly in the background within a private mount namespace
-unshare --propagation slave -m "$MODDIR/daemon" --system-server-max-retry=3 "$@" &
+# Start the daemon directly in the background within a private mount namespace.
+# Not every environment's unshare understands --propagation: toybox builds that
+# implement only a subset of util-linux reject the flag outright, which leaves
+# the daemon dead with nothing anywhere to say so. Probe the flag with a
+# throwaway command and fall back to progressively simpler invocations.
+if unshare --propagation slave -m true >/dev/null 2>&1; then
+  unshare --propagation slave -m "$MODDIR/daemon" --system-server-max-retry=3 "$@" &
+elif unshare -m true >/dev/null 2>&1; then
+  unshare -m "$MODDIR/daemon" --system-server-max-retry=3 "$@" &
+else
+  "$MODDIR/daemon" --system-server-max-retry=3 "$@" &
+fi