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Hello again dear Chinaphonearena users,
I' m using my kingzone N3 since one month now, the phone is excellent but I encounter some bugs with it ; when I take some pictures with the camera, a brown spot appears on the middle of the screen, even when I cleaned it properly ; so my photos are all affected. I wonder if it's a hardware or software issue. Could you help me please. Thanks for reading and have a nice day.

Some people have had a similar issue with Ulefone Be Pro, but not as bad as this. According to @Nexustrix , this was supposed to be fixed with a software update, but haven't heard back from users yet if it was fixed. In my opinion its a hardware defect.