Disabling OTA?

I have unlocked and rooted this phone.
I am using custom ROM.
Today I started getting a notification of an update. I have disabled the OTA app and also went into the cache and deleted the update file. As well as disabled package installer. I am still getting the notification of an update. How can I get rid of it?

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USB debugging keeps disabling

So i just updated my Zenfone 2 ze551ml and wanted to root the phone. But everytime I enable the USB debugging, it gets enabled for 5 seconds and gets disabled immediately. Doesn't matter if I am connected via USB or not, just keeps getting disabled for no reason.

Twice it has rebooted while enabling the USB debugging, so something is amiss.
Any suggestions on what should be done? I cannot root my phone/install custom rom/recovery without it. This problem started with the last major update, and the new 24mb update did not solve it.

Disabling or closing soft keys on specific applications

Is it possible to disable or cloae the soft keys on certain applications? I've seen methods of disabling them altogether. While playing certain games they're closed but while playing others they're still on the screen.

Knock code enabling / disabling with Tasker

I'm sure the answer is going to be stupidly obvious, but I cannot for the life of me get Tasker to disable the lockscreen (knock code) via a task.

The end goal is simply for me to enable the knock code when I am not connected to my HOME Wi-Fi, and disable it when I am connected to it at home. I've set it up similar to other phones I've used but I simply can't get it to function on the G4 (ever owned LG before so it could be a specific way to do it with them and knock codes).

Tasker is set as a phone administrator. Can anyone either show what profiles/scripts they have that DO work, or walk me through the process?