Originally Posted by chamber-music
Many people have brought this one up and its been explained multiple times.
They never said Charles and Erik invented Cerebro and the version Hank invented was destroyed. Professor X and Magneto may of built A
Cerebro meaning the version we see in the Singer X-Men movies most likely.
Your other points are valid though
Cerebro is obviously in the film next year, and they are going to have to build it. But what role would it serve? What mutant do they have to recover? Or could it just be to pinpoint Trask's location? Or the Sentinel base?