sony z3 compact d5803 lollipop update problems

Hi I have a sony z3 compact D5803 and I recently done the lollipop 5.1.1 update (build number 23.4.A.0.546) since I have done the up date my camera will only focus on things real close like on the hairs on my arm, It wont focus on the person sitting next to me or things that are any more than a few inches away. My up button on my volume has also stopped working I'm guessing these are related in the problem as the update was supost to upgrade the camera and the volume settings I think. Is there a quick fix to this or do I need to downgrade to KitKat 4.4.4 or lollipop 5.0 witch I think I was on. My laptop is running windows 10 dose the flash tool install on that and will it work ok and where can I find the firm ware for the downgrades if I need to do them. I'm new to this site and any help will be great :):):)