How can I permanently block marshmallow 6.0 upgrade?

[AC Question]

How to permanently block marshmallow 6.0 upgrade
The upgrade removes many of my favorite features most importantly the legibility settings and text booster
I replaced my phone with a new one before marshmallow 6.0 and would like to keep the new one from becoming corrupted by the 6.0

 

[the tall guy]

Hi, you'll need to root the device to remove the notification.

 

[pkcable]

Welcome to Android Central! If you join the forums here's how....

http://forums.androidcentral.com/ask-question/409154-join-android-central-community.html

You'll be able to go to other sections and post (you can still visit as a guest either way), and you will find that we have a sub forum for rooting your device under MOST device catagories. Just find your phone and enter that forum and if it's a rootable device it should have a rooting sub forum.