[tdkl]

Classic "don't fix it if it ain't broken". How have you manage to disable the System update annoyance ?

Shitty Lollipop made me sell the Nexus 5 last year with its bad battery life and memory leak (and they still didn't fix the mobile radio wakelock), but when downgrading to 4.4 it was next to impossible to block the notification. I remember methods used at time just caused the Google Play Services to hold the wakelock, since the update checker became a part of it.

[infinityplus1]

Press and hold the notification, select App Info, disable notifications. That has worked for me very well.

[tdkl]

On the Nexus? I remember that checkmark being disabled for the update notification.