My htc m8 show the android recovery boot screen. How to fixed this?

When I update my htc m8 lollipop to marshmallow after download the marshmallow update the device install little bit and then just stop the installation and show android recovery screen. Now the android recovery screen is permanent. When I reboot my device it show the android recovery screen. Please anyone suggest me what to do. image url: i.imgur.com/HJHn4oT.jpg

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