@pjs_gsy in my experience of deco updates, if it ain't broke, don't fix it.  If your WiFi is stable then leave the updates we'll alone.  They have caused nothing but problems for me personally. 

I know that we should theoretically apply latest updates for security and stability but in my experience it always ended up breaking something causing me more hassle. 

My old apple airport extreme went out of support years ago and yet I never had a single issue until I had to update due to the need for faster throughput. 

My advice would be leave well alone unless there's a specific problem that you're trying to address that is covered by a firmware update. 

Unless you enjoy losing a day of work trying to fix all of the problems that clicking that tempting update button causes in the promise of a better Wi-Fi experience. 

It's up to you of course... 

Good luck. 

Br, 

Rob.