Also the transfer of the WiFi/Bluetooth antenna is completely missing. In my case the antenna to logic board connector cable broke, so i had to replace it
crucial information is missing:
when removing the lightning connector module, not only the black "rubber gasket" attached to the microphone needs to be carefully transfered to the new rear case, but also
-the rectangular black plastic microphone filter with the small cylindrical extrusion, which is stuck to the case
-the grid/foam frame protecting the speaker, which is also glued to the case
-the 2 gold connector rings around the screw holes on the upper black plastic part at the bottom of the case.
-the metal piece remotely similar to a "bone" shape, two rings connected by a longer part, stuck to the lower black plastic part at the bottom of the case.
-in general the 4 metal parts screwed to the side of the case, functioning as snap-locks for the front display. (3x with 2 snap lock elements, 1x with only 1, next to the volume rocker
-the black ring round the hole where the wifi/bluetooth antenna goes, underneath the vibration motor.
depending on the case you're getting, all of these need to be transfered.
The pictures on removing the battery adhesive strips are not very accurate, i have (sadly only later) found pictures on another guide that show how the adhesive strips need to be pulled past the SIDES of the battery. my careful attempt to follow your instructions here resulted in ripping both adhesives. so i did the plastic card thing which you suggest in step 24, AND THERE IS DEFINITELY A CAUTION NOTICE MISSING!! i had no idea that under the top of the battery was the upper component flex cable, which i then irreperably damaged with the card. now i had to order that one too and have to removely almost the whole phone from its casing to replace that cable... PLEASE put a caution notice in at step 24 to warn other users not to go too high up from the side of the battery in order to not damage the upper component cable. thanks