I dont know nothing about rooting(truthfully)
Back up yopur phone with smart switch and do a full master reset. Once you have done that, do not ever go to check software update.WHY, it registers your device and then bombards you daily with software update icons.
Mine has run 2 months since doing this without any software update icons popping up.
Yes I hate updates with ui, not security updates.
Older phones are a disaster and have big iisues with new ui updates and it has been a proven fact for the past 10 years and nobody cares to do anything about it.
The moderators here are to remove all negative comments against android and phone manaufacturers and make the end user look like idiotic fools that don't understand how to use their device. They are here to help android and manufacturers, not end user. This site is a strong positive promotion for new android and does not wish to expose or admit there is any fault when new ui is released. It's always the end user or the phone needs to go to service.
Welcome to the biased world we live in