factory data reset is only option.
Issue during face unlock sometimes. Automatically it gets screen lock and black screen.
camera issue too while clicking photo with flash option
I said white is peace
No portrait mode in op 3/3T but we can blur 40 percent
ok then...... simple u can also update in phone first download Android 8 for 3t from one plus website and then copy zip file and flash it through ur...
official update will be available in December month
then first take up a backup of ur data fully...... save it to ur computer...... Factory reset ur device and then update ur device to Android 8 via...
current Android version
Then u need to download rom from one plus site and flast via recovery mod if still the problem exist then visit near showroom it may be fault in...