Front Camera Button Missing!

My front camera button is got missing for the last 2month, didsony companion repair, did flash LP ftf , now im on MM stock rooted (BL unlocked), and I can see the front cam button apperaing only when I tap on menu, and when I tap on the front cam button, camera stops working! :(

Model: E2333 ,Sony Xperia M4 Aqua Dual , 6.x Stock

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