Help! I purchased a 2nd hand camera called YI M1 mirrorless camera and it was okay for some time but one time I forgot to put on the cover for the body when I took out the lens. After some time I noticed a very little white pixel on the upper right corner part of the picture. I noticed it when I was cropping my picture. It looks like just one pixel that looks dead, it is there even if I take a shot with the cover on. I want to know if this is a hardware issue or can be fixed if I update it's firmware or something. What caused this? Anyone else had the same experience with their mirrorless cameras? You will find it on the upper right corner just at the tip of the leaf. Then the bottom picture is the zoomed part of that and as you can see it is clearly something that shouldn't be there. Please help, thanks in advance.