I understand your situation and we as BAs too have faced similar situation. But kindly have patience.
First of all kindly, remove obscene media from previous posts. Share your exact problem details below. Also include which city you belong to, where did you go for smartphone checkup, did they refuse to accept your device.
the things that u r saying is entirely new. a50 is such a device that heat very less. FP is less accurate but actually it will work. If u face such issues try formatting ur mobile once. it may be because of any bugs. if u have any update do it..