Some evidence is surfacing that iOS11 working on some devices fine, yet bricking/locking up on others MAY be related to the type of processor used in the handset. For example, iphone 6s can have either N71AP or N71MAP processor. The iphone6s handsets with N71AP SOC appear to be the ones having iOS11 lockup problems. Everybody, please download the app "iPhone battery memory system status monitor". It is a free app that identifies the health, memory available, CPU performance and specific chipset used in your phone. Very handy. Touch the "System" tab at the top. Under the first header "Device" you will see "MODEL", to the right is your SOC (CPU) part number. The iPhone 6S will have either N71MAP or the N71AP. My malfunctioning iPhone7 with iOS11 has the D101AP processor. The other processor type in iPhone7 is the D10AP. Apple insists my logicboard is bad despite it formerly working perfectly with iOS10 (not once did it crash in the 1 year since it was new) and wants to charge $350 for exchange as the phone is just over 1 week out of warranty. Please help to identify if iOS11 is specifically INCOMPATIBLE (at the time of this post) with N71AP (iphone 6) and the D101AP (iphone 7). Most importantly if your phone is working, please indicate your CPU here to see if there is any truth to the actual CPU type causing these problems. Let's build a map. For iPhone7+ users, you will either have the D11AP or D111AP processor. There are subtle differences between the processors (at least with the N71 series). All other phones with ios11, please report your CPU here as well and whether or not your iOS11 is working to see if there is a pattern. Thanks!