A sure way to stop getting messages about security updates or OS updates ready to download/install, you have to disable the ‘Motorola update services’ app because that is what you see displaying these messages.
You cannot do this through the menus on the phone, the disabled button is grayed out.
You have to enable developer options within settings and then within that, enable USB debugging. This is done so you can tether the Motorola phone to a PC. USB mode has to be in photo sharing mode, not file transfer mode.
Get Android SDK tools so you can run the ADB command from a DOS window. It's around a 25 MB download in a zip file.
Then open up a command prompt with administrative privileges. Type adb devices to make sure it sees the phone. If not, you need to acknowledge a request on the phone that should pop up.
Next, type, adb shell pm disable-user --user 0 com.motorola.ccc.ota ,,,, that's it you are done. You can go back into settings and your full list of apps and you will see that Motorola update services is now disabled!
Now you will no longer have that pesky OS update notification every 24 hours like I did because my phone was unlocked.
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