mobile

My device fully complete the lollipop update OTA, But fails to install, and gives me a red triangle with exclamation mark.
when i press the volume up and power button to know the reason of error, it shows me "/system/bin/flash_camera" as shown in the attached snap shot photo.
noting that the motherboard has been changed before in the service center,device not rooted before, battery fully charged, having enough space and finally factory data retested.
Could u help me to solve the problem?

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