How to stop SMS'S nagging to update?

I am hoping you can help me. I have a problem with the Blackberry Q10 and Z10.
Out of 3 Blackberry phones, two were bricked after installing the updates.
I do not wish to have my last working phone bricked, so I am wondering how to turn of the constant nagging SMS's to upgrade???
My Z10 is working fine as is. I cannot afford to buy another Blackberry after being forced to upgrade.

main screen , swipe down, settings, software updates, options, TURN OFF

Thanks redchilli88. I had allready turned off what I could. But I am still getting nags to update to the new Blackberry 10os. I have managed to, only get the notifications in the notification area of the Hub. Still the Update notification nag will come up as soon as I swipe the phone from the sleep mode.
There is only the update, remind me later or too go to the website. No option to opt out there. An annoying feature if your in a hurry and you cannot access your phone until you have dealt with it. Dealing with it means opening the " go to the download websit"e then closing the app down.