Need to specify presigned certificate
diff --git a/update.sh b/update.sh
index d5d113d..cbedbd9 100644
--- a/update.sh
+++ b/update.sh
@@ -10,6 +10,7 @@
 LOCAL_MODULE_TAGS := optional
 LOCAL_SRC_FILES := bin/$1
 LOCAL_MODULE_CLASS := APPS
+LOCAL_CERTIFICATE := PRESIGNED
 
 include \$(BUILD_PREBUILT)
 EOF