cam unable to focus...only shows blurr vision
Doesn't explain your inability to search. It's a hardware issue talk to CS.
if it is a Hardware issue then why it works with older version of Android?
if it is a Hardware issue...then why it is perfectly focus in older version of Android? only problem with android 9
So you've rolled back to android Oreo and the problem is fixed? Why if its a software problem is it only a tiny few affected?
The rear camera focusing issue on the 3/3T is a widely report and commonly known HW failure.
Had you used the forums search, before creating an unnecessary thread, you'd already know the facts regarding this HW failure/defect. By reading and one of the dozens upon dozens of existing threads discussing the problem, including how to fix it.
Take or send your device into a OnePlus service center for inspection for possible repairs and have the rear camera module replaced.
Vote for the best App of the Month – Productivity edition
by dsmonteiro, 2019-07-22