Can I cancel an Android update? My Motorola Ultra is running 4.4.4 and I've been holding off on upgrading to the next one since I don't want to lose any possibility of getting root. However, this morning when the notification popped up, I accidentally selected "Don't remind me, just update at this time", the time being noon tomorrow. When it tries to start the update, is there anyway I can stop it?
I've already found this hopeful answer:

I just spoke to Google directly. The Nexus 5 under settings, apps has
something called Google Play services. Not store. If you uncheck the
notification box in Google Play services and restart the phone the
notification for the Android system updates will stop in the
notification bar. Worked like a charm!
From: How do I skip an Android system update and stop its notifications?

Moreover, if your devise had been rooted, you should be able to install Disable Services and find the SystemUpdateService under Google Services Framework. Disable it.
As you have device with Android Kitkat please read also that article: https://www.droidmen.com/how-to-stop-downloading-of-android-os-update-in-android-phone/
It should work.