READ THIS BEFORE INSTALLING PLEASE
This app is kept only for archive purpose. This app doesn't stop normal system/application/google thing update process, so don't try it if you need to stop normal update. Also please don't rate this 1 star just because it doesn't work as you expected. You may need this only if your Android version is 4.x-5.x and have a special bug. (See details below.)
OK Google, Sleep!
This is a simple app to fix SystemUpdateService wakelock which keeps your favorite Android device awake and drains much battery. [Root required]
This app is provided 'AS IS', use under your own risk! If you don't have this problem, don't install it!
Install the app on your device. Launch it once. Grant it root permission. Forget it.
It needs to autostart every time your device boots. Don't kill it manually or "Force Stop" it, please.
If you don't want it anymore, uninstall it from Settings, and reboot.
If the app doesn't work for you, please enclose your device model, Android version, Google Play Service and Google Service Framework version in your comments. These information are useful to me and everyone. If you are a developer and want to help me, please post any useful information at https://github.com/Jamesits/DisableSystemUpdateService/issues .
Released under GPL3. For more information, see https://github.com/Jamesits/DisableSystemUpdateService