I have the same issue, I was trying to fix this for weeks. All version of iOS from 11.2 ~ 11.2.5 Bootloop, Lagging on the screen / unresponsive Front and Rear cameras not working Volume Buttons takes too long to respons (2 -4 sec delay) But I was able to partially fix this by upgrading to 11.3 (15E5178f) - you can download this at the apple developers page. Everything works except for the ear piece speaker, I'm sure it's not ear speaker or the flex because front cam works fine and when I try to make a call I can hear the dial sound coming out from the ear speaker, but when the call starts, no sound comes out from the ear speaker. The speaker button on the call menu is also disabled during the call.