i had the same problem yesterday. i was able to crack the issue and i am out of it now. i saw a small crack in the flex cable which connects the motherboard with the touch id. i had to replace the whole backlight assembly for one broken cable (unlike iphone 6 and earlier models).. for understanding more u can watch this video (link below). later for solving slow boot i reinstalled the ios and both of my problems got solved. https://www.youtube.com/watch?v=6XMA-hGIqys&t=568s
i have a solution which probably may work, i am saying "probably" because same thing happened with my iphone 6 plus and iphone 7 after upgrading to ios 10.2.1....... but this solution worked with iphone 7 and not with 6 plus... here it is:- after trying several times to restore both iphone with ios 10.2.1 (Didnt Work), i restored both of my iphones with ios "10.3 BETA 2"..... iphone 7 started working normally and iphone 6 plus didnt
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