iPad Pro A1584 updated to 16.2

I have an iPad Pro 12.9” gen 1. Two days ago, I got a normal warning “system update available”

for my surprise, it showed iOS 16.2, I knew this iPad “couldn’t” GP over iOS 15.xx. But, didn’t question the availability, just thought Apple changed the limits.

Anyway, now my iPad is on iOS 16.2, and always showing the warning “System update available” but in the option to update, shows “iPadOS 16.2 is updated”

also noted some bad performance, in basic operations, like using safari.

the question is, what. To do to fix it?

thank you and regards