I have the same issue but i cant take it to apple because my uncle gave it to me and apple is really strict about this and if you cant show real proof that you have the reciet and purchased the device, they wont do a thing. he dosnt have the reciet anymore

ios 14 is a new release but i have been using it on my main iphone 7 when you could install it as beta and everything worked, try see if you can download ios 13 unless this ios 14 update is official and from what ive heard, its official so try replace camera if you cant get ios 13 back