Why i can't use my flashlight and back camera?

I am using MyPhone My87 DTV .Few days ago, after an unidentified reason, the flashlight icon inside my quick setting disappeared. By that, i can't use my back camera anymore. I had reset my phone, but result still the same.
I had tried all the possible solution inside google but i can't bring my flashlight and back camera Back.

Can you give some solution?

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