For ripe bananas with brown spots, peel bananas, cut it in half, push your finger into the ends of bananas to separate them into thirds. Place them in dehydrator tray closest to the heat as yhey dry slower than apples.

Turn dehydrator on at 135 degrees and leave it for 8 hrs , or so until the fruits are dried to your liking. No preservatives or additives. I also did mangos too.