I don't know how to do that with what can be reached. I did find, on reddit, of all things, a post by someone who thought the phone was bricked but it turned out it was some kind of talkback accessibility accidentally switched on by the simultaneous pressing of the up and down volume buttons. The Play seems to have only one such control. Then I investigated settings, with limited availability, and found that, but when I finally managed to switch it off, it made no obvious difference. Yes, I rebooted after that, seemingly to no effect.