How is the One UI 9 Stable on Samsung S26, is it worth doing the software update or should wait and update

It says Device is not certified tried resetting the device at first thought it was Google problem but this is device problem how to fix it.

In the S26 google play system update is showing an exclaimation mark but when I go in there is no update also in Google play store it says device not certified, how do I rectify this

Why is all app notifications block and the toggle are greyed out, how to change this the samsung calculator

Why is the notification shade opening when I am on callTried Force RestartTried Safe modeTried Checking through *#0*#Still not sensing properly the notification shade pops up as soon as the phone touches the ear.